Pirodus

Pirodus
Temporal range: Carboniferous Moscovian
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Holocephali
Order: †Eugeneodontiformes
Family: †Caseodontidae
Genus: †Pirodus
Species:
†P. conicus
Binomial name
†Pirodus conicus
Lebedev, 2001

Pirodus (meaning 'Pirochi tooth') is an extinct genus of cartilaginous fish from the Carboniferous of Russia. It is classified as a member of the order Eugeneodontiformes and the family Caseodontidae. The genus includes a single species, P. conicus, which is known only from a single, incomplete fossil of its teeth. These teeth were fused together and sat along the midline of the jaw, and were surrounded by fused dermal denticles.

Discovery

The holotype and only specimen of Pirodus conicus was described by researcher Oleg Lebedev in a 2001 paper, and originated from the Shchurovo-Korobcheyevo Formation of Moscow Oblast, Russia. This locality has been dated to the Moscovian stage of the Carboniferous period. The holotype specimen is in the collection of the Paleontological Institute, Russian Academy of Sciences and is catalogued as PIN 2804/328.[1][2]

The genus is named after the village of Пирочи (Pirochi), which is near where the only known specimen was found, combined with the Greek suffix ὀδούς or odoús, meaning 'tooth'. The name of the type and only species, P. conicus, is derived from the Latin conicus, and refers to the shape of its teeth.[2]

Description

Pirodus is known from a single fragment of a tooth-whorl surrounded by dermal denticles, which is about 17 millimeters (0.67 in) in height. The tooth-whorl of this taxon was an unpaired structure positioned along the midline of the jaw, and consisted of a single fused base (or root) with multiple flattened, overlapping crowns protruding from it. The tooth crowns were conical, rather than bulbous and rounded like in related genera.[1][2] The denticles of the taxon are large and pointed, and those around the margins of the tooth-whorl may have been fused to the teeth.[3]

The tooth crowns are composed of a form of dentin termed tubular dentin, while the base is composed of a form called trabecular dentin.[2]

Classification

Pirodus is a member of the family Caseodontidae and the order Eugeneodontiformes (alternatively referred to as the synonymous order Edestida).[1][2] Oleg Lebedev noted that the appearance of the tooth-whorl is most similar to that of the caseodont genus Ornithoprion.[2]

References

  1. ^ a b c Ginter, Michał; Hampe, Oliver; Duffin, Christopher J. (2010). Handbook of paleoichthyology: teeth. München: F. Pfeil. p. 119. ISBN 978-3-89937-116-1.
  2. ^ a b c d e f Lebedev, Oleg. "Middle Carboniferous of the Moscow Syneclise (Southern Part)". Paleontological Characteristics (in Russian). 2: 196–200.
  3. ^ Lebedev, Oleg A.; Popov, Evgeny V.; Bagirov, Sergey V.; Bolshiyanov, Igor P.; Kadyrov, Rail I.; Statsenko, Evgeny O. (2021-11-15). "The earliest chimaeriform fish from the Carboniferous of Central Russia". Journal of Systematic Palaeontology. 19 (12): 821–846. doi:10.1080/14772019.2021.1977732. ISSN 1477-2019.

Content Disclaimer

Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.

  1. The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
  2. There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
  3. It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
  4. Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
  5. Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.