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Look up operculum or opercular in Wiktionary, the free dictionary. Operculum may refer to: Operculum (brain), the part of the brain covering the insula...

brain anatomy, an operculum (Latin, meaning "little lid") (pl.: opercula), may refer to the frontal, temporal, or parietal operculum, which together cover...

An operculum is an anatomical feature, a stiff structure resembling a lid or a small door that opens and closes, and thus controls contact between the...

The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills;...

An operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in...

In the bryozoan order Cheilostomatida, the operculum is a calcareous or chitinous lid-like structure that protects the opening through which the polypide...

follicle. The soft tissue covering a partially erupted tooth is known as an operculum, an area which can be difficult to access with normal oral hygiene methods...

In botany, an operculum (pl.: opercula) or calyptra (from Ancient Greek καλύπτρα (kalúptra) 'veil') is a cap-like structure in some flowering plants,...

birds are covered by an operculum (plural opercula), a membraneous, horny or cartilaginous flap. In diving birds, the operculum keeps water out of the...

The operculum papillare is the iris found in the eyes of elasmobranchs (skates, sharks and rays). It can undergo pupillary light reflex to such an extent...

Inflamed excess gum flap (inflamed operculum marked by green arrow) over wisdom tooth...

main conical shell (previously referred to as a 'conch') and a cap-like operculum. Some also had two curved supports known as helens They are calcareous...

formation of lesions on both sides of the anterior or posterior region of the operculum. In contrast, the unilateral form is rare and is caused by the formation...

2 mm. An operculum of a juvenile snail. The scale bar is 1 mm. An operculum of an adult snail. The scale bar is 1 mm. Adult snails with operculum indicated...

shell specimens of various marine molluscan taxa. A successor to the Lost Operculum Club List of Champions (1950–1987) and World Size Records (1964–1990)...

with gills and an operculum, an aquatic gastropod mollusk in the family Viviparidae. The name "trapdoor snail" refers the operculum, an oval corneous...

that have oil glands. The sepals and petals are fused to form a "cap" or operculum over the stamens, hence the name from Greek eû 'well' and kaluptós 'covered'...

the operculum of a snail, a gastropod mollusc. Not all gastropods have opercula, but in the great majority of those that do have one, the operculum is...

contain actual gills. Usually no spiracle or true operculum is present, though many species have operculum-like structures. Instead of internal gills, they...

fingernail-like operculum, or trap door, of certain sea snails, such as Strombus lentiginosus, Murex anguliferus, and Onyx marinus. It may be the operculum of a...

Turbo is a genus of large sea snails with gills and an operculum, marine gastropod molluscs in the family Turbinidae, the turban snails. Turbo is the...

ramshorn apple snail, is a species of large freshwater snail with an operculum, an aquatic gastropod mollusc in the family Ampullariidae, the apple snail...

side. This opening is hidden beneath a protective bony cover called the operculum. Juvenile bichirs have external gills, a very primitive feature that they...

whelk or sea snail, a marine gastropod mollusc that has gills and an operculum, and is classified within the family Littorinidae, the periwinkles. This...

Acanthina punctulata has been disturbed, and has retracted into the shell, using its claws to bar the entrance in the same way the snail used its operculum....

as the round-mouthed snail, is a species of small land snail with an operculum, a terrestrial gastropod mollusk in the family Pomatiidae within the superfamily...

assassin snail or bumblebee snail, is a species of freshwater snail with an operculum, an aquatic gastropod in the family Nassariidae, most of which are marine...

cannot be retracted within it (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the aperture, which provides...

snails, are a family of freshwater snails with gills and a protective lid (operculum). Their family tree is complex, and genetic evidence suggesting some species...

Baicaliidae is a family of small freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the superfamily Truncatelloidea. (Original...

Viviparus viviparus is a species of large freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Viviparidae, the river snails...

Poteria is a genus of tropical land snails with gills and an operculum, terrestrial gastropod mollusks in the family Neocyclotidae. Species within the...

substructures: the anterior insula on the insular lobe and the frontal operculum on the inferior frontal gyrus of the frontal lobe. Because of its composition...

the beluga whale. In these species, it is usually called the operculum or the operculum pupillare. In the bottlenose dolphin, it has the function of allowing...

vetigastropods. It includes recent and extinct sea snails with gills and an operculum. Extant trochomorphs stem from a large, archaic clade. According to Uribe...

curved to rounded operculum 3–7 mm (0.12–0.28 in) long; Eucalyptus camaldulensis Dehnh. subsp. camaldulensis has a strongly beaked operculum, incurved or irregularly...

therewith the operculum, and thereby improve it. Maharitz, citing the Kol Bo, says that the purport of using this soap was to whiten the operculum withal, since...

Taia naticoides is a species of a freshwater snail with an operculum and a gill. It is an aquatic gastropod mollusc in the family Viviparidae - commonly...

area overlying the insula toward the lateral surface of the brain is the operculum (meaning lid). The opercula are formed from parts of the enclosing frontal...

Tudorella sulcata is a species of land snail which has an operculum, a terrestrial gastropod mollusk in the family Pomatiidae. The species (T. s. sulcata)...

known as the river snails, is a genus of large, freshwater snails with an operculum, aquatic gastropod molluscs. They are primitive members of the clade Caenogastropoda...

Pila is a genus of large freshwater snails with an operculum, African and Asian apple snails, aquatic gastropod mollusks in the family Ampullariidae,...

Hua is a genus of freshwater snails with an operculum, an aquatic gastropod mollusks in the family Semisulcospiridae. Species within the genus Hua include:...

Calliostoma is a genus of small to medium-sized sea snails with gills and an operculum, marine gastropod molluscs within the family Calliostomatidae, the Calliostoma...

Pila globosa is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails. (Described...

Monterissa is a genus of minute cave snails with an operculum, gastropod mollusks in the family Hydrocenidae. Species within the genus Monterissa include:...

snails. Members of the Rissoidae are very small in size and possess an operculum. Rissoidae are found worldwide. They live on sandy or gravel bottoms among...

Bellamya monardi is a species of large freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Viviparidae. This species...

and behind each eye. The skull proper was joined by the bones of the operculum. The skull itself was composed rather loosely, with a joint between the...

Opisthostoma shelfordi is a species of air-breathing land snail with an operculum, a terrestrial gastropod mollusk in the family Diplommatinidae. This species...

"common tower shell" is a species of medium-sized sea snails with an operculum, marine gastropod mollusks in the family Turritellidae. This species occurs...

operculum falls off. In other groups of mosses, the capsule is either nematodontous with an attached operculum, or else splits open without operculum...

differ from other sabellid tube worms in that they have a specialized operculum that blocks the entrance of their tubes when they withdraw into the tubes...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

cells which nourish developing spores. Operculate – referring to the operculum. Operculum – the "lid" of the sporangia. At maturity, it falls off and the stoma...

name the giant tower cap snail, is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Pachychilidae. B. herculea...

Lavigeria is a genus of tropical freshwater snails with a gill and an operculum, aquatic gastropod molluscs in the family Paludomidae. All species are...

underside of the mesosoma possesses a bilobed and laterally elongated genital operculum (a covering of the gonopore), followed by pectines (comb-like sensory...

Pyrgulopsis giuliani, is a species of very small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species...

Fonscochlea aquatica is a species of small freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae...

Opisthostoma inornatum is a species of small land snail with an operculum, a terrestrial gastropod mollusc in the family Diplommatinidae. This species...

calcareous operculum readily distinguishing them from the somewhat similar Trochidae or top snails, which have a corneous operculum. This strong operculum serves...

Circulus is a genus of very small and minute sea snails with an operculum, marine gastropod mollusks in the family Vitrinellidae. According to the World...

Adelopoma is a genus of land snails that have an operculum and a gill, terrestrial gastropod mollusks in the family Diplommatinidae. Species within the...

species of small freshwater and brackish water snail with a gill and an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites. This...

Jardinella tullyensis is a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Tateidae. This...

Pomacea maculata is a species of large freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails...

Omphalotropis costulata is a species of small salt marsh snail with an operculum, a terrestrial gastropod mollusk, or micromollusk, in the family Assimineidae...

consists of the skull (formed from loosely connected bones), eyes, mouth, operculum, gills, and a pair of nostrils (which has no connection to the oral cavity)...

Taheitia is a genus of very small land snails that have an operculum and live near saltwater, maritime terrestrial gastropod mollusks in the family Truncatellidae...

Pila ampullacea, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails. This...

usually hollow and delivers chemicals from the cnida to the target. An operculum (lid) over the end of the cnida. The lid may be a single hinged flap or...

Jagora asperata is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. Jagora asperata is the type...

movement of the operculum can abrade the coral tissue, and that mortality of the coral tissue is enhanced when the worm's operculum hosts filamentous...

(Pyrgulopsis texana) is a species of very small freshwater snail with an operculum, an aquatic gastropod in the family Hydrobiidae. This species is endemic...

Renea is a genus of air-breathing land snails with an operculum, terrestrial gastropod mollusks in the family Aciculidae. Species within the genus Renea...

Cleopatra guillemei is a species of freshwater snails with an operculum, aquatic gastropod molluscs in the family Paludomidae. This species is found in...

Somatogyrus parvulus, is a species of small freshwater snail that has an operculum, an aquatic operculate gastropod micromollusc in the family Lithoglyphidae...

Lyogyrus bakerianus is a species of very small freshwater snail which has an operculum, an aquatic prosobranch gastropod mollusc in the family Amnicolidae. The...

Bithyniidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the Littorinimorpha. Their shells are very small and...

is elongated with parallel margins and is truncated at the base. The operculum is very small relative to the size of the shell. It is corneous, narrowly...

superfamily of small to very large vetigastropod sea snails with gills and an operculum. Species within this superfamily have nacre as the inner shell layer....

Cecina is a genus of sea snails which have a gill and an operculum, gastropod mollusks or micromollusks in the family Pomatiopsidae. They live in shallow...

teeth, the peristome, which before ripeness is closed by a beak-shaped operculum. The enlarged venter or calyptra is cap-shaped and smooth. Hypnales are...

or trumpet snails, is a family of tropical freshwater snails with an operculum, aquatic gastropod mollusks in the superfamily Cerithioidea. Many species...

Bithynia siamensis is a species of a freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusk in the family Bithyniidae. WHO...

Apical view of the Shell of Angaria sphaerula (Kiener, 1838) with operculum measuring 24.1 mm in height by 34.4 mm diameter, taken by tangle nets off...

T. draco consists of one spine on each operculum and five to eight dorsal spines. The spines on the operculum point towards the cauda, or tail, and are...

the forward edge of the disc is made up of the extended bones of the operculum sweeping backwards from the cranium and surrounding the trunk on either...

concentric to the arcuated columella which has a pearly groove. The unusual operculum has four strong ridges on its outer side decorated with hard shelly bristles...

Quadrasiella is a genus of minute, salt marsh snails with an operculum, aquatic gastropod mollusks, or micromollusks, in the family Assimineidae. Species...

converted into a vascularised lung. Most species have a shell, but no operculum, although the group does also include several shell-less slugs. Pulmonates...

furrow, opening through narrow slits; see also Book lungs Branchial operculum: see operculum Bulbus: see palpal bulb Calamistrum (plural calamistra): Modified...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

containing feather duster worms Serpulidae, sabellids with a specialized operculum Phoronida, the phylum containing horseshoe worms Microconchida, an order...

Pomacea lineata is a species of a freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails...

Gomathi Chakra is the operculum of a kind of rare sea snail in the family Turbinidae.‌ One place these opercula are found is in the Gomathi River, Dwarka...

Austroassiminea is a genus of minute, salt marsh snails with an operculum, aquatic gastropod mollusks, or micromollusks, in the family Assimineidae. Species...

There are spines on the supracleithrum and there are 2 spines on the operculum, the lower one being normally directed downwards and slightly towards...

freshwater snails that includes the mystery snail species. They present an operculum and simultaneously have a gill and a lung as respiratory structures, which...

cosmopolitan family of very small freshwater and brackish water snails with an operculum, in the order Littorinimorpha. Hydrobiidae are found in much of the world...

Belgrandiella pelerei is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species...

more flattened cone. The aperture is elongated and narrow with the sharp operculum being very small. The outer lip is simple, thin, and sharp, without a...

turban, is a large species of marine gastropod with a thick calcareous operculum in the family Turbinidae, the turban snails. The shells of these large...

a group of primitive "prosobranch" gilled snails which have a shelly operculum. Neritiliidae — 5 extant freshwater species Neritidae — largely confined...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

500 mm. They are marine gastropod mollusks. Most of the species have no operculum. This family of sea snails are found mainly in tropical seas, though some...

Bithynia is a genus of small freshwater snails with an operculum, aquatic prosobranch gastropod mollusks in the family Bithyniidae. The diploid chromosome...

checkered nerite, is a species of tropical sea snail with a gill and an operculum, a nerite, a marine gastropod mollusk in the family Neritidae, the nerites...

paucicostata is a species of tropical freshwater snail with a gill and an operculum, aquatic gastropod mollusc in the family Paludomidae. This species is...

Amphicyclotus is a genus of tropical land snails with gills and an operculum, terrestrial gastropod mollusks in the family Neocyclotidae (according to...

Cytora aranea is a species of very small land snails with an operculum, terrestrial gastropod molluscs in the family Pupinidae. This species occurs in...

Vittina is a genus of brackish water and freshwater snails with an operculum, aquatic gastropod mollusks in the subfamily Neritininae of the family Neritidae...

wholly extinct acanthodian fish. Key characters of this group include an operculum and a single pair of respiratory openings, features which were lost or...

slovenica is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae, which are sometimes...

serve in closing the opening of the shell in much the same way as an operculum, but more recently they are postulated to have been a jaw apparatus. The...

schniebsae is a species of small freshwater snails with a gill and an operculum, an aquatic gastropod mollusc in the family Hydrobiidae. Nicolaia schniebsae...

Nesiocina is a genus of land snails with an operculum. It is a genus of terrestrial gastropod mollusks in the subfamily Helicininae of the family Helicinidae...

open left side. Like all air-breathing water snails, the animal has no operculum, and has only one pair of tentacles with the eye spots at the base of...

Ammolite Ammonoidea Bone Copal Coral Ivory Jet Nacre (Mother of pearl) Operculum Pearl Seashell Some rocks are used as gems, including: Anthracite Anyolite...

Alcadia is a genus of tropical and subtropical land snails with an operculum, terrestrial gastropod mollusks in the subfamily Helicininae of the family...

Esperiana esperi is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Melanopsidae. Distribution of this species...

Diplommatina lateralis is a species of land snails with an operculum, terrestrial gastropod mollusks in the family Diplommatinidae. This species is endemic...

Gyrotoma pumila, was a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species...

Lobatus peruvianus* Their large muscular foot (which connects to the operculum) can be seen in this photo. This is what the Lobatus peruvianus uses to...

Victodrobia millerae is a species of very small freshwater snail with an operculum, an aquatic gastropod mollusc in the family Hydrobiidae. This species...

Opisthostoma bihamulatum is a species of small land snail with an operculum, a terrestrial gastropod mollusc in the family Diplommatinidae. It is endemic...

Tylomelania zeamais is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. This species occurs...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

in the family Thiaridae. They are aquatic gastropod mollusks with an operculum. Species within the genus Melanoides include: Melanoides admirabilis (Smith...

Koster's tryonia, is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Cochliopidae. This species...

Operculum of Bithynia transsilvanica...

response to nearby prey touching the trigger. A stiff flap called an operculum opens and its stinging apparatus fires the barb into the prey. The venom...

the insula and exit to the cortex via the medial surface of the frontal operculum. The arteries fan superiorly over the pars triangularis and vascularize...

Tylomelania gemmifera is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. This species occurs...

snail, is a medium-sized to large species of sea snail with a calcareous operculum and a colorfully patterned shell, a marine gastropod mollusc in the family...

addition to the bubble raft, only the veliger, or larval stage, has an operculum, and the shell is paper-thin to allow the animal to float upside down...

elegant plectostoma, is a species of air-breathing land snail with an operculum, a terrestrial gastropod mollusk in the family Diplommatinidae. Predators...

Omphalotropis erosa is a species of small salt marsh snail with an operculum, a terrestrial gastropod mollusk, or micromollusk, in the family Assimineidae...

troostiana, the Mossy Elimia, is a species of freshwater snail with an operculum, aquatic gastropod mollusc in the family Pleuroceridae. This species is...

snout, five on the sides and five at the front. The upper angle of the operculum is incised and the edge of the preoperculum is smooth and not serrated...

Homalocantha secunda Shell of Homalocantha secunda (Lamarck, 1822), with operculum, 40.2 mm in length, by scuba diver at 100 ft., off Rameswaram, India Scientific...

Georissa filiasaulae is a species of a minute land snail that have an operculum, terrestrial gastropod mollusk in the family Hydrocenidae. This species...

Boucardicus delicatus is a species of land snail with an operculum, a terrestrial gastropod mollusc in the family Hainesiidae. This species is endemic...

transverse ridges, which are covered with dense, erect, tiny scales. The operculum is brown and horny, and it corresponds to the opercula typical of the...

Cochlostoma achaicum is a species of small land snail with an operculum, a terrestrial gastropod mollusc in the family Cochlostomatidae. C. achaicum is...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Shell and operculum of Calliostoma ligatum (Gould, 1849)...

Lepomis derives from the Greek λεπίς ("scale") and πῶμα ("cover", "plug", "operculum"). The genus' most recognizable species is perhaps the bluegill. Some...

is an extinct European species of freshwater snail with gills and an operculum, a gastropod mollusk in the family Lithoglyphidae. Glöer P. (2002). Die...

diverse. The Hyolitha are a class of extinct animals with a shell and operculum that may be molluscs. Authors who suggest they deserve their own phylum...

20 in) long and 2–3 mm (0.079–0.118 in) wide with a rounded or conical operculum that is shorter and narrower than the floral cup at the join. Flowering...

Palaina patula is a species of small land snail with an operculum, a terrestrial gastropod mollusk or micromollusks in the family Diplommatinidae. This...

Spiralix heisenbergi is a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Moitessieriidae...

Semisulcospira morii is a species of freshwater snail with an operculum and is an aquatic gastropod mollusc in the family Semisulcospiridae. This species...

Fukuia multistriata is a species of amphibious freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pomatiopsidae. This species...

Leptopoma is a genus of land snails with a gill and an operculum, terrestrial gastropod mollusks in the family Cyclophoridae. Species within the genus...

have five pairs of them, the flap in front of them being the genital operculum which lacks gills. Book gills are flap-like appendages that effect gas...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Paludomus is a genus of tropical freshwater snails with an operculum, aquatic gastropod mollusks in the subfamily Paludominae of the family Paludomidae...

snail, is a South American species of freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Ampullariidae. These snails...

contrast, bony fishes have a single outer bony gill covering called an operculum. Most sharks and rays have five pairs of gill slits, but a few species...

illustration of a live Cittarium pica, showing the inner surface of the operculum at the top Five views of a shell of Cittarium pica Scientific classification...

Paramelania is a genus of tropical freshwater snails with an operculum, aquatic gastropod mollusks in the family Paludomidae. Species of the genus Paramelania...

Tropidophora is a genus of land snails with an operculum, terrestrial gastropod mollusks in the family Pomatiidae. These large, split-sole snails are...

Semisulcospira reiniana is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Semisulcospiridae. Semisulcospira...

Nanivitrea alcaldei is a species of small freshwater snail that has an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. Nanivitrea alcaldei...

Gyrotoma lewisii, was a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species...

Striadorbis is a genus of minute freshwater snails that have an operculum, aquatic gastropod molluscs or micromolluscs in the family Glacidorbidae. Species...

a swim bladder, only three pairs of gill arches hidden behind a bony operculum, and a predominantly bony skeleton. Under this classification system,...

Neptunea lyrata Apertural view of a shell of Neptunea lyrata showing the operculum Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda...

Assimineidae is a family of small snails, also known as palmleaf snails, with an operculum, gastropod mollusks or micromollusks in the superfamily Truncatelloidea...

snails, is a taxonomic family of very small freshwater snails with an operculum, aquatic gastropod mollusks. The family Valvatidae has no subfamilies...

shell can be closed, and even completely sealed, with a sort of door or operculum. The aperture of many snail shells is more or less round, rounded, elliptical...

Omphalotropis latilabris is a species of small salt marsh snail with an operculum, a terrestrial gastropod mollusk, or micromollusk, in the family Assimineidae...

Edgbastonia jesswisseae is a species of small freshwater snails which have an operculum, aquatic gastropod molluscs in the family Tateidae. This species is endemic...

Paladilhia is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Moitessieriidae. Species...

Filopaludina is a genus of freshwater snails with a gill and an operculum, aquatic gastropod molluscs in the family Viviparidae. The indigenous distribution...

Klappenbach 1965, Burnay & Conceição 1983, etc.). However, the presence of an operculum excludes it from Olivancillaria. Abbott & Dance (1986) included it in...

named for the fish. The genus name Pomoxis refers to crappies' sharp operculum, while the species name annularis means 'having rings', i.e., it has vaguely...

Dimorphoptychia is an extinct genus of land snails with an operculum, terrestrial gastropod mollusks in the family Helicinidae. Dimorphoptychia is the...

gradually increase in size, and are somewhat swollen above and below. The operculum is brown and horny. This species occurs in Guadeloupe. Alcadia guadaloupensis...

name Pleurocera foremani, is a rare species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Pleuroceridae. This species...

Paludomus ajanensis is a species of tropical freshwater snail with an operculum, aquatic gastropod mollusc in the family Paludomidae. The natural habitat...

gemstones Abalone Amber Ammolite Copal Coral Black Precious Ivory Jet Nacre Operculum Pearl Tortoiseshell Other natural objects Bezoar Bog-wood Ebonite (vulcanite)...

family of small land snails, also known as staircase snails, with an operculum, terrestrial gastropod mollusks in the superfamily Cyclophoroidea. The...

belong to lineages in the Caenogastropoda, and tend to have a gill and an operculum. The largest clade of non-pulmonate land snails is the Cyclophoroidea...

upper jaw, the operculum or gill cover (absent in sharks and jawless fish), and the cheek, which extends from eye to preopercle. The operculum and preopercle...

Clithon is a genus of freshwater snails or brackish snails that have an operculum, aquatic gastropod molluscs in the family Neritidae, the nerites. Distribution...

Cincinnatia is a genus of very small freshwater snails that have an operculum, aquatic gastropod molluscs in the family Hydrobiidae, the mud snails. The...

Idiopyrgus is a genus of freshwater snails with gills and an operculum, aquatic gastropod mollusks in the family Tomichiidae. The distribution of the...

Pyrgulopsis is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae. The name Pyrgulopsis is...

snail, is a species of medium-sized to large sea snail with a calcareous operculum, a marine gastropod mollusk in the family Turbinidae, the turban snails...

Paramiella kondoi is a species of a land snail with gills and an operculum, a terrestrial gastropod mollusk in the family Neocyclotidae. This species...

elimia (Elimia fusiformis) was a species of freshwater snail with an operculum, aquatic gastropod mollusks in the family Pleuroceridae. This species...

pectoral fins are located towards the head of the fish right behind the operculum and are exceedingly long with the pelvic fins located right beneath it...

Nereina punctulata is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites. Distribution...

Fonscochlea is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Tateidae. The genus is...

the genus Sarracenia, the problem of pitcher overflow is solved by an operculum, which is essentially a flared leaflet that covers the opening of the...

(common name: nerite snails), is a genus of small aquatic snails with an operculum in the family Neritidae, the nerites. They are as well marine, brackish...

Pyrgulopsis chupaderae, is a species of small freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae...

Faunus ater is a species of brackish water snail with an operculum, an aquatic gastropod mollusc in the family Pachychilidae. Faunus ater is the only...

name Somatogyrus crassilabris, was a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Lithoglyphidae. This species...

Pseudamnicola chia is a species of very small freshwater snail with an operculum, an aquatic gastropod mollusc in the family Hydrobiidae. P. chia is endemic...

Hemistomia lacinia is a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Tateidae. This...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

parietal wall are curved showing a thin, yellowish-white callus. The horny operculum is small and oval. The color of the shell varies between yellowish-brown...

reinforced with calcium carbonate, and thus it superficially resembles an operculum, except that it has a tiny hole to allow some oxygen exchange.[citation...

may not have scales and has no spines or serrations on its margin. The operculum is scaled and also has no spines. The mouth is slightly oblique and can...

Phallomedusa is a genus of small, air-breathing land snails with an operculum, a pulmonate gastropod mollusc. Phallomedusa is the only genus in the subfamily...

coahuilae, is a species is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae...

phonological processing deficits are associated with damage to the left frontal operculum". Cortex. 42 (4): 624–643. doi:10.1016/S0010-9452(08)70399-X. PMID 16881271...

Ogasawarana metamorpha is a species of land snail with an operculum, a terrestrial gastropod mollusk in the family Helicinidae, the helicinids. This species...

lacks an aptychus, a biomineralized plate which is proposed to act as an operculum which closes the shell to protect the body. However, aptychus-like plates...

cylindrical lioplax, is a species of freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Viviparidae. This species...

Phallomedusa austrina is a species of small, air-breathing land snail with an operculum, a pulmonate gastropod mollusc. Australia. Golding R. E., Ponder W. F...

Behind the skull were four gill arches, which were covered by a soft operculum. The animal had a scaleless, fusiform body and a diphycercal tail fin...

("double") and operculum, refers to the distinguishing feature that unites the superfamilies included in the group, that the genital operculum is made up...

its body. The gills of debeeriids were covered by a soft flap termed an operculum, which was supported by the fish's hyomandibular arch. The jaws of debeeriids...

Hemistomia napaia is a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Tateidae. This...

Assiminea moroccoensis is a species of minute, salt-tolerant snail with an operculum, an aquatic gastropod molluscs, or micromolluscs, in the family Assimineidae...

Lithoglyphus apertus is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Lithoglyphidae. The distribution of...

arches are supported by a midline fourth basibranchiale. An ossified operculum is present. The gill arches are equipped with rows of parallel 3-to-12-centimetre-long...

Hydrobia is a genus of very small brackish water snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae. Species within...

Pseudostreptaxis azpeitiae is a species of small land snail with an operculum, terrestrial pulmonate gastropod mollusc in the family Cyclophoridae. The...

Tricula bollingi is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pomatiopsidae. This species...

Macropoma (from Greek μακρός "large" + πόμα "cover", after its large operculum) is an extinct genus of coelacanth in the class Sarcopterygii. Fossils...

upper posterior part of the operculum. operculum The bony flap that covers the gills. opercular Pertaining to the operculum. opercular spine A spine projecting...

possess modified pedipalps to insert sperm into the female's genital operculum. It exhibits a multitude of colors, with bright yellowish leg stripes...

Ogasawarana yoshiwarana is a species of land snail with an operculum, a terrestrial gastropod mollusk in the family Helicinidae, the helicinids. Ogasawarana...

body are fully scaled, with scales reaching onto the top of the head and operculum, though the cheek remains unscaled. In many gobies, including the mangrove...

common name the stony ampullaria, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails...

Pleurocera is a genus of freshwater snails with an operculum, aquatic gastropod molluscs in the family Pleuroceridae. Pleurocera is the type genus of...

History 2: 23–34. Morton, N. (1981). Aptychi: the myth of the ammonite operculum. Lethaia 14(1): 57–61. doi:10.1111/j.1502-3931.1981.tb01074.x Morton,...

The canal inside is wide and the entrance can be closed by a horny oval operculum. The knobbed whelk lives subtidally and is migratory, alternating between...

Neothauma is a genus of freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the subfamily Bellamyinae of the family Viviparidae...

through the foot and is attached at its other end to inner face of the operculum (if present). The columellar muscles are contracted when the animal needs...

Crosseana crosseana is a species of small freshwater snail with an operculum, aquatic gastropod mollusc or micromollusc in the family Tateidae. This species...

Amnicola decisus is a species of freshwater snail with an operculum, an aquatic gastropod mollusk belonging to the family Amnicolidae. The size of the...

section.) Wikimedia Commons has media related to Brodmann area 40. parietal operculum Brodmann area List of regions in the human brain Stoeckel, C; Gough, PM;...

absent) or aperturate (apertures present). The aperture may have a lid (operculum), hence is described as operculate. However the term inaperturate covers...

pockets on the back and flattened front end, the latter covering the operculum at least until it is completely formed. M. opercularis can be found on...

Ancistrolepis grammatus Ancistrolepis grammatus shell and operculum Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Subclass:...

poricidal dehiscence or operculate dehiscence) that is referred to as an operculum or it may not (inoperculate poricidal dehiscence or inoperculate dehiscence)...

Omphalotropis is a genus of minute salt marsh snails with an operculum, terrestrial gastropod mollusks in the subfamily Omphalotropidinae of the family...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Proserpinellidae is a taxonomic family of land snails with an operculum, terrestrial gastropod mollusks in the superfamily Helicinoidea. This family has...

Pyrgulopsis fairbanksensis, is a species of small freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Anentome spinosa is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the subfamily Anentominae of the family Nassariidae...

Troschelvindex is a genus of land snails with an operculum: these terrestrial gastropod mollusks are in the family Pomatiidae. Species within the genus...

Aulacospira pluangtong is a species of small land snail with an operculum, terrestrial pulmonate gastropod mollusc in the family Cyclophoridae. It is...

two species on characters such as operculum length - E. conferruminata is said to have a relatively short operculum. Eucalyptus lehmannii belongs in Eucalyptus...

Tylomelania wallacei is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. This species occurs...

yellow-green ventrally. Unlike bluegill, the male has a cherry-red edge on its operculum; females have orange coloration in this area. The adult fish are between...

name the peninsula amnicola, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Amnicolidae. The specific...

is a taxonomic family of small to large tropical land snails with an operculum, terrestrial gastropod mollusks in the order Architaenioglossa belonging...

Hemistomia neku is a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Tateidae. This species...

antipodarum) is a species of very small freshwater snail with a gill and an operculum. This aquatic gastropod mollusk is in the family Tateidae. It is native...

area overlying the insula toward the lateral surface of the brain is the operculum (meaning lid). The opercula are formed from parts of the enclosing frontal...

Austropyrgus halletensis is a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the Hydrobiidae family...

Drawing of the shell and operculum by W. H. Dall....

authors list (link) Morton, N. 1981. Aptychi: the myth of the ammonite operculum. Lethaia 14(1): 57–61. doi:10.1111/j.1502-3931.1981.tb01074.x Morton,...

Others developed a bony flap over the gill openings analogous to the operculum in later bony fishes[citation needed]. However, most of these characteristics...

name the Florida applesnail, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails...

operate, opus oper- cover Latin operire, operculum interoperculum, kerchief, opercular, operculiform, operculum ophi- snake Greek ὄφις, ὄφεως (óphis, ópheōs)...

some enemies or overwhelm aggressive small ants and the like. It has no operculum; during dry or cold weather it seals the aperture of the shell with a...

operculum Plural: opercula. A membraneous, horny or cartilaginous flap covering the nares of some birds. For example, in diving birds, the operculum keeps...

Tylomelania is a genus of freshwater snails which have an operculum, aquatic gastropod mollusks in the family Pachychilidae. In the aquarium hobby, snails...

than those of most other vertebrates. With their mandibles, they cut the operculum off from their prey with a unique "sawing" motion. A. boa has been observed...

47–1.10 in) in length and 4–7 mm (0.16–0.28 in) wide with a horn-shaped operculum that is up to 2.5 times as long as the floral cup. Flowering occurs from...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Neoprososthenia is a genus of freshwater snails with gills and an operculum, aquatic gastropod mollusks in the family Pomatiopsidae.[citation needed]...

called a seta, and a capsule capped by a cap called the operculum. The capsule and operculum are in turn sheathed by a haploid calyptra which is the remains...

Fluminicola is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Lithoglyphidae. Species...

purpurascens Shell of Conus purpurascens G. B. Sowerby I, 1833, with operculum, measuring 83.7 mm in height, collected at low tide on Venudo Island,...

Valvata cristata is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk or micromollusk in the family Valvatidae, the...

Ohridohauffenia drimica was a species of very small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae, the river snails...

Aulacospira hololoma is a species of small land snail with an operculum, terrestrial pulmonate gastropod mollusc in the family Cyclophoridae. The height...

the center of the crown. The trap is a vertical tube with a 'hood' (the operculum) extending over its entrance; and below it the top of the tube usually...

protuberance is marked with diagonal black lines, the membrane of the operculum is white, the lips have pale blue edges and the caudal fin is largely...

retracts the plume into its tube and seals the tube with its obturaculum, an operculum made of collegen. The respiratory lamellae are supported by the obturaculum...

usually free, with the opening directed upward. Some species have an operculum and some do not. Damaged sections of the shell can be sealed off by calcareous...

tennesseensis, is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species...

is almost obsolete. The spiral sculpture extends to the interior. The operculum is unknown. This marine species is endemic to New Zealand and occurs off...

folds are especially prominent toward the anterior end of the shell. The operculum is corneous and claw-like in shape, partially covering the aperture. According...

Neptunea Apertural view of a shell of Neptunea ithia, the operculum glued in place on cotton. From British Columbia, Canada. Scientific classification...

Ditropopsis is a genus of small land snails with a gill and an operculum, terrestrial gastropod mollusks in the family Cyclophoridae. Distribution of...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

conditions, an adaptation to low light. There is a single flat spine on the operculum. Like other members of the perch family, the zander has a split dorsal...

valve snail, is a species of small freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Valvatidae, the valve snails...

elephant pupinid snails, is a genus of land snails with a gill and an operculum. They are in the family Pupinidae, superfamily Cyclophoroidea. This genus...

5–7 mm (0.20–0.28 in) wide with a rounded, conical or slightly beaked operculum. Flowering occurs in most months and the flowers are white. The fruit...

Aulacospira triptycha is a species of small land snail with an operculum, terrestrial pulmonate gastropod mollusc in the family Cyclophoridae. The height...

Paramelania iridescens is a species of tropical freshwater snail with an operculum, aquatic gastropod mollusk in the family Paludomidae. This species is...

species by its somewhat protruding lower jaw and the dark banding on its operculum. It is of minor importance to fisheries throughout its range, taken by...

with crimson red spots throughout, sepals 10-veined, petals 3-veined and operculum papillose at the head region. B. stocksii has uniformly ochre yellow flowers...

mud-flat snail in English) is a species of air-breathing snail with an operculum, a pulmonate gastropod mollusc which lives in a habitat that is intermediate...

simplex, the simple opisthostoma, is a species of small land snail with an operculum, a terrestrial gastropod mollusc in the family Diplommatinidae. The species...

which the shell has a pearly interior and the snail has a calcareous operculum; marine gastropod mollusks, marine gastropod molluscs in the family Turbinidae...

enlarged, hinged premaxillaries, denticles on the esca, and a branched upper operculum. However, significant differences were noted between the two genera, and...

Triton’s trumpet A live Charonia tritonis A shell of C. tritonis with its operculum in place in the aperture Conservation status Secure (NatureServe) Scientific...

be conical or chisel-shaped. Clownfish have saw-shaped edges along the operculum (gill covering) and under the eyes, which is the source of their genus...

plate is wide, inverted T-shaped and 3 millimetres (0.12 in) long. The operculum called cover sits on the egg sloping towards the ventral side, creating...

involved in the expression of fear and anxiety, such as the right parietal operculum and supramarginal gyrus. Consistent with gain anticipation, the slope...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Tylomelania helmuti is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. The specific name helmuti...

either nematodontous with an attached operculum (as in the Polytrichopsida), or else splits open without operculum or teeth. There are two subtypes of arthrodontous...

the upper part of the capsule dehisces, usually forming a terminal lid (operculum) that opens (see illustration). An example is Plantago. A variant is the...

Boucardicus simplex is a species of land snail with an operculum, a terrestrial gastropod mollusc in the family Hainesiidae. This species is endemic to...

Diplocaulus. His argument relied on the possibility that the horns supported operculum-like vertical pouches protecting external or internal gills. One possibility...

pectoral fin is shorter than the longest rays of that fin and wide, the operculum is forked, and the skin is naked without spinules. The skin extends past...

a species of very small or minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

gemstones Abalone Amber Ammolite Copal Coral Black Precious Ivory Jet Nacre Operculum Pearl Tortoiseshell Other natural objects Bezoar Bog-wood Ebonite (vulcanite)...

Omphalotropis rubens is a species of small, salt marsh snail with an operculum, aquatic gastropod mollusk, or micromollusk, a terrestrial gastropod mollusk...

There is frequently a streak of red running from the snout to the upper operculum. They typically have reddish lips and usually the centre of each scale...

is a predatory or ectoparasitic species of marine gastropod with an operculum, in the family Epitoniidae, the wentletraps. In the 17th and 18th century...

the water, they close the entrance to their tubes with a shield-like operculum made of dark setae. When submerged, they extend their tentacles out of...

Chamalycaeus is a genus of tropical land snails with an operculum, terrestrial gastropod mollusks in the family Alycaeidae. As of 30 November 2020[update]...

Semisulcospira libertina is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Semisulcospiridae. Widespread...

blue lines and spots on the head in front of the eye, the cheek and the operculum. The fins are yellowish-orange and the caudal fin has an orange margin...

many sharp teeth. The first dorsal and anal fins are spinous, as is the operculum. Walleyes are distinguished from their close relative the sauger by the...

prey to enter, but hinders its escape. The lid over the entrance, the operculum, prevents rainwater entering the pitcher and thus diluting the digestive...

the Apache springsnail, is a species of small freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae...

is a European species of small brackish water snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species...

pre-Rolandic artery (precentral sulcal artery), the Rolandic operculum (post-central operculum), the Rolandic area (primary motor cortex), the substantia...

Arganiella is a species of very small freshwater snail with an operculum, an aquatic operculate gastropod mollusks in the family Hydrobiidae. Species...

Campeloma Drawing of a shell and operculum of Campeloma decisum Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Subclass:...

Tylomelania mahalonensis is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. The specific name...

combined length of the fused hypanthia and each operculum is about 30–45 mm (1.2–1.8 in). The operculum is horn-shaped and about four to six times the...

cerebellum. Another meta analysis reported bilateral reductions in insula, operculum, STG, medial frontal cortex, and ACC, but also reported increased GMV...

bluish green colour and the head brownish with a golden tinge on the operculum. The flanks are silvery, sometimes with a bronzy tinge, and there are...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Notopala sublineata is a species of large, freshwater snail with an operculum, an aquatic gastropod mollusc in the family Viviparidae, the river snails...

Opisthostoma mirabile is a species of air-breathing land snail with an operculum, a terrestrial gastropod mollusc in the family Diplommatinidae. It is...

abbreviated to MTS by aquarists), is a species of freshwater snail with an operculum, a parthenogenetic, aquatic gastropod mollusk in the family Thiaridae...

Anentome wykoffi is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the subfamily Anentominae of the family Nassariidae...

Diplommatina crassilabris is a species of land snail with an operculum, terrestrial gastropod mollusc in the family Diplommatinidae. This species is endemic...

narrow elliptic leaves, oval to spindle-shaped buds with a long, narrow operculum and conical fruits. Eucalyptus alipes is a mallet that grows to a height...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

simply as a conch, is a species of very large sea snail with a gill and an operculum, a marine gastropod mollusk in the family Turbinellidae. This species...

Turbo imperialis Apertural view of a shell of Turbo imperialis with operculum in place Five views of a shell of Turbo imperialis Scientific classification...

Rapana A live but retracted individual of Rapana venosa showing the operculum, anterior end of the shell towards the upper left in this image. From the...

Tylomelania palicolarum is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. The specific name...

Melongenidae A live Melongena corona in the process of rolling over using its operculum Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda...

asci usually have a specially differentiated tip, either a pore or an operculum. In some hymenium forming genera, when one ascus bursts, it can trigger...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

the family Pleuroceridae. It is an aquatic gastropod mollusk with an operculum. This species is endemic to Alabama and Georgia in the United States....

Plectostoma everetti is a species of air-breathing land snail with an operculum, a terrestrial gastropod mollusc in the family Diplommatinidae. This species...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

peristome is continuous, six-angled externally. The aperture is round. The operculum is present, horny and multispiral. The nearest ally, Circulus smithi Bush...

adults are between 15 and 20 cm (6 and 8 in). Adults have striae on their operculum that aid in distinguishing Thaleichthys pacificus from other smelt. They...

Apertural view of a shell of Neptunea pribiloffensis also showing the operculum Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda...

in place to prevent hybridization, such as intricate morphology of the operculum in Lepomis, which assists in recognition of conspecific mates. To initiate...

the mouth is curved with fleshy lips. There is no spine in front of the operculum (the bony flap that covers the gills), the branchiostegal membranes are...

17–30 mm (0.67–1.2 in) long and 10–13 mm (0.39–0.51 in) wide with a conical operculum. Flowering mainly occurs between May and September and the flowers have...

Semisulcospira diminuta is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Semisulcospiridae. This species...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

Collatus is a genus of very small and minute sea snails with an operculum, marine gastropod mollusks in the family Vitrinellidae. Carinatus bicarinatus...

mystery snail, is a species of large freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Viviparidae, the river snails...

the pheasant shells, is a genus of small sea snails with a calcareous operculum and a colorfully patterned shell, a marine gastropod mollusc in the family...

long and about 3–4 mm (0.12–0.16 in) wide with a conical to horn-shaped operculum of similar dimensions. Flowering occurs between October and February and...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

tissue overlying the tooth. The tissue overlying the tooth is called the operculum, and the disorder is called pericoronitis which means inflammation around...

as well as numerous freshwater groups, and some land snails with an operculum. Prosobranchs have their gills, mantle cavity and anus situated in front...

stagnorum is a species of small brackish water snail with a gill and an operculum, an aquatic gastropod mollusk in the family Cochliopidae. This species...

quadrate. Seta 12–20 mm long, red. Capsules pendent, ovate, 0.85–2 mm long. Operculum convex, apiculate. Each leaf of B. argenteum comprises two structurally...

elimia or Virginia river snail, is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Pleuroceridae. Elimia virginica...

Hirthia globosa is a species of tropical freshwater snails with an operculum, aquatic gastropod mollusks in the family Paludomidae. This species is found...

Leptoxis virgata, is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species...

poorly developed, simple spine on the lower, posterior angle of the operculum. The gill rakers are oval shaped plates which are covered in small teeth...

brown, entirely corneous, circular, multispiral operculum which fits the aperture snugly. The operculum is formed of numerous gradually increasing whorls...

and slugs. Stylommatophorans lack an operculum, but some close their shell apertures with temporary "operculum" (epiphragm) made of calcified mucus....

Tylomelania carbo is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. The sister group (the...

Aulacospira krobyloides is a species of small land snail with an operculum, terrestrial pulmonate gastropod mollusc in the family Cyclophoridae. The height...

Lithopoma is a genus of medium-sized to large sea snails with a calcareous operculum, marine gastropod mollusks in the subfamily Turbininae of the family Turbinidae...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

gill. There is no evidence of the specialized gill basket and fleshy operculum present in living chimaeroids. The cranium of FMNH PF2204 is around 25...

of the preoperculum is serrated with a strong spine at its angle; the operculum has a small spine and a serrated flap above the origin of the lateral...

appendages. This is the genital operculum and is where horseshoe crabs keep their reproductive organs. Following the operculum are five pairs of book gills...

a deep anal notch on the shoulder, a smooth periostracum and a small operculum. The shoulder of the shell is usually nodulose and the protoconch is usually...

extended; the snail can retract these into the shell and close off with its operculum. The largest known specimen measured 604.8 millimetres (23.81 in) in shell...

hornsnail, is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae, the hornsnails...

poisonous needles located on its dorsal, anal, and ventral fins, and on its operculum. de Sola, L.; Herrera, J.; Keskin, Ç.; de Morais, L.; Smith-Vaniz, W.F...

are condensed into a pouch-like bundle covered by a sheet of skin (an operculum), with a single gill-opening in front of the pectoral fins. The pectoral...

orange bar with a purplish-black margin immediately behind the top of the operculum, and there are blue and orange lines at certain fin bases. Like all other...

very thin, almost sharp. The oblique columella, is slightly twisted. The operculum is thin. The headshield is developing secondary tentacles. This species...

poorly developed, simple spine on the lower, posterior angle of the operculum. The gill rakers are oval shaped plates which are covered in small teeth...

Vitta cristata is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites. This species...

Eutrochatella tankervillii is a species of tropical land snail with an operculum, a terrestrial gastropod mollusc in the family Helicinidae. The specific...

dolioides is a South American species of freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails...

Bolma is a genus of medium to large sea snails with a calcareous operculum, marine gastropod molluscs in the family Turbinidae, the turban snails. The...

slight pink flush present in the ventral area of the body between the operculum and the pelvic fins (corresponding roughly to the sac enclosing the alimentary...

Sinotaia quadrata is a species of a freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Viviparidae. It is widely...

Boucardicus fidimananai is a species of land snail with an operculum, a terrestrial gastropod mollusc in the family Hainesiidae. This species is endemic...

gemstones Abalone Amber Ammolite Copal Coral Black Precious Ivory Jet Nacre Operculum Pearl Tortoiseshell Other natural objects Bezoar Bog-wood Ebonite (vulcanite)...

topsnail or jeweled topsnail, is a medium-sized sea snail with gills and an operculum. This is a sublittoral marine gastropod mollusk in the family Calliostomatidae...

Assiminea mesopotamica is a species of minute, salt-tolerant snail with an operculum, an aquatic gastropod molluscs, or micromolluscs, in the family Assimineidae...

and middle frontal gyrus, pars triangularis, planum temporale/parietal operculum, anterior cingulate gyrus, insular cortex, and Heschl's gyrus; both thalami...

Crossata Apertural view of Crossata ventricosa (Broderip, 1833) with operculum Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda...

arrangement is mainly based on morphological data, such as details of the operculum including the material (calcareous in the Naticinae, corneous in the Polinicinae...

Pila occidentalis is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the apple snails family, Ampullariidae. The length...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

elimia (Elimia hartmaniana) was a species of freshwater snail with an operculum, aquatic gastropod mollusks in the family Pleuroceridae. This species...

has more the shape of a cylinder than the shape of a cone. The white operculum has heavily ridged walls. It can live up to ten years. It has been intensely...

Burdach's fissure: connects the brain's insula and the inner surface of the operculum. Calcarine sulcus or Calcerine fissure: extends from the occipital of...

caudal filament. The pectoral fins, which are attached posterior to the operculum, are long, broad at the base, and distally pointed. They rely on anal...

the opening of the cell is only narrowed and not completely closed. The operculum is then reopened some 2–3 days afterwards so the adults can eliminate...

related sabellid family, except that the former possess a cartilaginous operculum that occludes the entrance to their protective tube after the animal has...

Parafossarulus is a genus of freshwater snails with gills and an operculum, an aquatic prosobranch gastropod mollusks in the family Bithyniidae. Species...

their operculum. This is a small, round, calcareous plate that covers the opening of their shell when they retract their body inside. The operculum is important...

submandibulars (part of the lower jaw) and branchiostegals (part of the operculum which covers the gills), with some coelacanths, including living Latimeria...

parasites. It has been observed that Garibaldi will often hold their operculum open so that a Senorita can remove gill parasites. The red and white shrimp...

Cochlostoma septemspirale is a species of a land snail with an operculum, a terrestrial gastropod mollusk in the family Cochlostomatidae. The distribution...

Aulopoma helicinum is a species of small land snail with an operculum, terrestrial pulmonate gastropod mollusc in the family Cyclophoridae. It is endemic...

snail or zebra nerite, is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites. It...

Neothauma tanganyicense is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the subfamily Bellamyinae of the family...

the forward edge of the disc is made up of the extended bones of the operculum sweeping backwards from the cranium and surrounding the trunk on either...

genus of very small freshwater and brackish water snails that have an operculum, aquatic gastropod micromolluscs in the family Lithoglyphidae. Species...

Palaospeum is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Moitessieriidae. Palaospeum...

Diplommatina aurea is a species of land snail with an operculum, terrestrial gastropod mollusc in the family Diplommatinidae. This species is endemic...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

is wide. The whorls of the protoconch are eroded in the specimens. The operculum has a light horn color. It is rather broad and short. The soft parts are...

Jaw hyomandibula pharyngeal jaw Leydig's organ Mauthner cell Meristics Operculum papillare Papilla Photophore Root effect Shark cartilage Scales ganoine...

first operculum pair (genital operculum) bore a medially positioned genital appendage that extend until the posterior region of second operculum pair....

Crocidopoma is a genus of land snails with an operculum, terrestrial gastropod mollusks in the family Neocyclotidae. Species within the genus Crocidopoma...

Pseudamnicola meloussensis is a species of small brackish water snails with an operculum, aquatic gastropod mollusks in the family Hydrobiidae. This species occurs...

Pila pesmei is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails. The height...

species and may help in identification. The middle thoracic segment has an operculum on the underside, which may extend posteriorly and obscure parts of the...

comalensis is a species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk or micromollusk in the family Hydrobiidae...

Doryssa hohenackeri is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Pachychilidae. This species occurs...

Brotia verbecki is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. This species occurs in:...

of sea snail which has a shell with a pearly interior and a calcareous operculum. It is a marine gastropod mollusc in the family Turbinidae, the turban...

Westrapyrgus is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae. The genus...

Semisulcospira is a genus of freshwater snails with an operculum, an aquatic gastropod molluscs in the family Semisulcospiridae. Species in the genus...

frequently is a flap of gum (an operculum), overlying the tooth. Bacteria and food debris accumulate beneath the operculum, which is an area that is difficult...

Helicina platychila is a species of tropical land snail with an operculum, a terrestrial gastropod mollusc in the family Helicinidae. The description...

sheets on shells or rocks. The zooids are characterised by having an operculum that opens in the opposite way to other cheilostome genera; i.e. the hinge...

Helicina rostrata is a species of tropical land snail with an operculum, a terrestrial gastropod mollusc in the family Helicinidae. This is an endangered...

Ogasawarana microtheca is a species of land snail with an operculum, a terrestrial gastropod mollusk in the family Helicinidae, the helicinids. This species...

generally laterally flattened, have five pairs of gills protected by an operculum, and a mouth at or near the tip of the snout. The dermis is covered with...

shell is thick and whitish and is not covered by a pseudopallium. The operculum is horny. This species was embedded in the plates of an interradius of...

Bithynia walkeri is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Bithyniidae. It is only known...

the fraternal opisthostoma, is a species of small land snail with an operculum, a terrestrial gastropod mollusc in the family Diplommatinidae. It is...

Helicina is a genus of tropical and subtropical land snails with an operculum, terrestrial gastropod mollusks. This is the type genus of its family (Helicinidae)...

elimia (Elimia pupaeformis) was a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species...

pectoral fins are located on each side, usually kept folded just behind the operculum, and are homologous to the forelimbs of quadrupedal tetrapods or the upper...

or slip and fall, into the pitcher. Above the peristome is a lid (the operculum); in many species, this keeps rain from diluting the fluid within the...

Architaenioglossa is a taxonomic group of snails which have gills and often an operculum. They are primarily land and freshwater gastropod mollusks within the...

tough operculum, a door-like structure which is attached to the dorsal surface of their foot. In evolutionary terms, the appearance of an operculum occurred...

Helicinoidea is a taxonomic superfamily of land snails that have an operculum. In other words, they are terrestrial operculate gastropod mollusks. They...

Margarya catayensis is a species of large, freshwater snail with an operculum and a gill, an aquatic gastropod mollusk in the family Viviparidae, the...

Teratobaikalia macrostoma is a species of a freshwater snail with an operculum, an aquatic gastropod mollusk in the family Baicaliidae. Teratobaikalia...

†Leptoxis lirata, was a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species...

Sinistrofulgur perversum Sinistrofulgur perversum, with the operculum in place Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda...

35–0.43 in) long, 4–7 mm (0.16–0.28 in) wide with a conical to beaked operculum. Flowering occurs from May to November and the flowers are white. The...

Hemistomia gorotitei is a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Tateidae. This...

Brotia armata is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. This species occurs in Thailand...

interrupted transverse striations on body scales, and radial striations on the operculum of Sardina and Sardinops. A distinguishing feature of the Sardina from...

the body and are quite yellowish overall, especially on the face and operculum, which lack silvery, turquoise or dark red spotting/speckling. The second...

the shell can be closed at will with an operculum. A live Melongena corona rolling over by using its operculum Melongena corona laying eggs. The shell...

shell. However, this structure is emphatically not the same thing as an operculum, which is virtually non-existent in pulmonate snails, only occurring in...

Jagora is a genus of freshwater snails which have an operculum, aquatic gastropod mollusks in the family Pachychilidae. This genus is endemic to the Philippines...

specific symptoms of depression. The salience network is a cingulate-frontal operculum network that includes core nodes in the anterior cingulate and anterior...

Theodoxus jordani is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites. This species...

name Pleurocera showalterii, is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Pleuroceridae. This species...

gemstones Abalone Amber Ammolite Copal Coral Black Precious Ivory Jet Nacre Operculum Pearl Tortoiseshell Other natural objects Bezoar Bog-wood Ebonite (vulcanite)...

Georissa saulae is a species of a minute land snail that have an operculum, a terrestrial gastropod mollusk in the family Hydrocenidae. This species lives...

black metallic to blue-green and its belly is white. The edge of the operculum has a small, black spot, with no spots on the lateral line. Mackerel scad's...

having eight concentric coronas divided into five types; radii, pali. the operculum, the limen, and the trochlea, the most of any known plant., P. alata attracts...

Mysorelloides multisulcata is a species of tropical freshwater snail with an operculum, an aquatic gastropod mollusk in the family Paludomidae. Mysorelloides...

3–5 mm (0.12–0.20 in) long and about 3 mm (0.12 in) wide with a rounded operculum. Flowering occurs between August and January and the flowers are white...

species of freshwater snails, aquatic gilled gastropod molluscs with an operculum in the family Pleuroceridae. This species is endemic to Alabama in the...

colour with silvery flanks and a white belly, there is a dark spot on the operculum. This species attains a maximum fork length of 60 centimetres (24 in)...

Bythiospeum acicula is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae. This species...

Phrantela kutikina is a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Hydrobiidae. This...

curve towards the axis of the shell. The aperture is subovate, and the operculum is thin and light brown. Length 14 to 45 mm. This snail occurs in the...

Quadrasiella clathrata is a species of small, salt marsh snails with an operculum, aquatic gastropod mollusks, or micromollusks, in the family Assimineidae...

Potamopyrgus is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Tateidae. Stimpson (1865)...

the family Pleuroceridae. It is an aquatic gastropod mollusc with an operculum. This species is endemic to the Black Warrior River drainage in Alabama...

ear. In many amphibians, there is also a second auditory ossicle, the operculum (not to be confused with the structure of the same name in fishes). This...

Clypeolum owenianum is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites. This...

irregular oval orange blotch near the rear of the body and a white bar on the operculum. The caudal fin is predominantly orange, but its posterior margin is white...

pattern, the pectoral fins being located immediately posterior to the operculum or gill cover, whilst the pelvic fins are located some way farther back...

Clithon lentiginosum is a species of a freshwater snail with an operculum, a nerite. It is an aquatic gastropod mollusk in the family Neritidae, the nerites...

Bothriocephalidea and Diphyllobothriidea. Eggs have one flat end (the operculum) and a small knob on the other end. All pseudophyllid cestodes have a...

characteristically large flower buds in groups of three with a bright red operculum, bright yellow to yellowish green flowers and sculptured, bell-shaped...

protective calcareous tube and employs the operculum as a "plug" to occlude (close) the entrance to the tube. The operculum, which is usually similar in color...

front of the eye, one from the preopercular margin to the middle of the operculum, and one from the back edge of the eye to the angle of the preoperculum...

Austropyrgus tateiformis is a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the Hydrobiidae family...

processing requirements. The network is composed of the anterior insula/operculum, dorsal anterior cingulate cortex, and thalamus. The CO network is frequently...

can, under the right conditions, grow up to 125 mm (4.9 in) long. The operculum is large, ear-shaped in outline, and is corneous and somewhat transparent...

Clithon oualaniense is a species of brackish water snail with an operculum, a nerite. It is an aquatic gastropod mollusk in the family Neritidae, the...

Heteropoma is a genus of minute, salt marsh snails with an operculum, aquatic gastropod mollusks, or micromollusks, in the family Assimineidae. Species...

flanks. There is bright yellow on the edges of jaws and the inside of the operculum. There is a blotch on the axil of the pectoral-fin. This species reaches...

Troschelviana is a genus of land snails with an operculum, terrestrial gastropod mollusks in the family Helicinidae. Species within the genus Troschelviana...