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segments known as the preoperculum (or preopercle), suboperculum (or subopercle), interoperculum (or interopercle) and operculum (or opercle). The preoperculum...

vertebrae. Unlike Polypterus, Erpetoichthys lack pelvic fins and the subopercle, and the long dorsal fin, which consists of a series of well-separated...

indentation on the vertical limb. There are a few small serrations on the subopercle and interopercle. In the juveniles the anterior and posterior nostrils...

a deeply incised rear margin of the operculum. there is a long, thin subopercle which has its dorsal end tapering to a point and an oval ventral end....

genus from extant salmonids. The subopercle exhibits an anterodorsal process which meets the edge of the subopercle at approximately a 60° angle. Also...

having almost stratigh dorsal edges to the frontal bones and a long, thin subopercle with a clearly oval ventral end. They differ from the metamorphosed females...

on the edge of the disc and the small three pointed tubercles of the subopercle. This species has a maximum published standard length of 6.5 cm (2.6 in)...

on the edge of the disc are forked at their tips. The tubercles on the subopercle are split into 4 short spines. The tubercles on the upper and lower sides...

standard length. The concentration of pigment lies to the centre of the subopercle and the dorsal pigmentation is confined to the upper sides. The maximum...

lower edge of the gill cover, the next runs from lower edge of eye to subopercle, and the third is the most indistinct and runs from the dark streak on...

slit is straight, vertical and the same length as the eye diameter; the subopercle bone of the operculum (gill flap) lacks a groove; it possess a pouch below...

scales. The scales on the breast are quite large. The buckler on the subopercle is blunt with no strong spines. The anal fin almost extends as far as...

bone with a straight anterior edge. Below it are the interopercle and subopercle, both of which are much smaller than the opercle and are missing their...

and another darker stripe which runs from the lower edge of eye to the subopercle, while a third stripe runs from front of the eye and sips between the...

along with ornamentation made up of tubercles present on the opercle and subopercle. Though uncommon in the group, taxa such as Unicachichthys and Vegrandichthys...

have unpigmented skin between the nostrils, and the inner surface of the subopercle is also unpigmented. The caudal peduncle has no subdermal pigments, and...

twice as tall as it is wide. Growth lines can be seen on both it and the subopercle. A large unknown bone with four parallel ridges can also be found in this...

nostril on each side of snout and no barbels on the chin. The opercle and subopercle have strong spines. The only scales on the naked body are on the two lateral...

on the edge of the disc have two points at their tips while those on subopercle have 4 points, there are no tubercles on the lower body except for afew...

scales resemble bucklers or simple spines. The buckler-like scales on the subopercle are typically weel-developed and have some enlarged spines. There are...

between 4 and 7 spines on the rostrum, the margins of the disc and the subopercle with a tubercles having three points on the tail. There are many lines...

face; they also serve in respiration and feeding. Preopercle Opercle Subopercle Interoptercle Bones of the basibranchial region occur ventral to the opercular...

on the edge of the disc have two points at their tips as are those on subopercle also have two points> the tubercles on the lower body are simple and also...

the skull roof. Within the operculum, the opercle is larger than the subopercle though the exact ratio between the two bones differ based on the species...

those on tail and lower body are simple and single pointed and those on subopercle are split into 4 short spines. The background colour of the body is black...

the disc are forked with depressions at their bases and those on the subopercle are split into 3 or 4 short spines while those on the tail are simple...

the anterodorsal part of the operculum and anteroventral part of the subopercle only to radiate throughout the respective bones. Together, these bones...