From Surf Wiki (app.surf) — the open knowledge base

Lissodus

Extinct genus of cartilaginous fishes

Summary

Extinct genus of cartilaginous fishes

Lissodus is an extinct genus of hybodont. While fossils attributed to this genus are known spanning from the latest Devonian (Famennian) to the very end of the Cretaceous (Maastrichtian), others consider the genus to have a more narrow range, spanning from the Early Triassic to the end of the Early Cretaceous (Albian). Lissodus is often placed in the family Lonchidiidae, though other authors consider it incertae sedis within Hybodontiformes. Lonchidion has often been regarded as synonymous, but many recent authors consider it to be a distinct but closely related genus. Some authors have proposed that Lissodus is not a valid genus, and that its teeth instead represent a morphological type present among many juvenile hybodonts but that is later lost in adults.

Description

Lissodus sensu lato (including Lonchidion) has been estimated to have had a body size range of 15-50 cm. Typical dental features of this genus include a single central cusp, base of teeth expanding towards the lingual side and riddled with vascular canals. The shape of the main cusp and large canal openings are similar to those of the Cassisodus margaritae although latter has cusplets on both sides of the crown. The low crowned teeth suggest that Lissodus was a bottom dweller that fed by crushing hard shelled organisms (durophagy).

Distribution

Remains of Lissodus sensu lato have been found worldwide in both marine and freshwater environments.

One tooth of indeterminate Lissodus species is known from the Tournaisian Laurel Formation, Australia.

Preserved skull and postcranial remains are known for the Early Triassic species L. cassangensis and L. africanus from Angola and South Africa respectively.

Species

Known species:

Lissodus africanus
Lissodus angulatus
Lissodus bartheli
Lissodus cassangensis
Lissodus cristatus
Lissodus guenneguesi
Lissodus hasleensis
Lissodus johnsonorum
Lissodus leiodus
Lissodus leiopleurus
Lissodus lepagei
Lissodus levis
Lissodus minimus
Lissodus wardi
Lissodus xiushuiensis

References

J. Fischer Brief synopsis of the hybodont form taxon ''Lissodus'' Brough, 1935, with remarks on the environment and associated fauna Freiberger Forschungshefte Serie C, 528 (2008), pp. 1-23
Jan Rees & Charlie J. Underwood. (2002). "The status of the shark genus ''Lissodus'' Brough, 1935, and the position of nominal ''Lissodus'' species within the Hybodontoidea (Selachii)". [[Journal of Vertebrate Paleontology]].
Voris, Jared T.. (2017). "Ontogenetic heterodonty in ''Reticulodus synergus'' (Chondrichthyes, Hybodontiformes) from the Upper Triassic of the southwestern U.S.A., with a redescription of the genus". Journal of Vertebrate Paleontology.
Brett Roelofs, Milo Barham, Arthur J. Mory, Kate Trinajstics. (January 2016). "Late Devonian and Early Carboniferous chondrichthyans from the Fairfield Group, Canning Basin, Western Australia". Palaeontologia Electronica.
"PBDB".

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

hybodontiformes prehistoric-cartilaginous-fish-genera fossil-taxa-described-in-1935 mesozoic-fish-of-asia carboniferous-cartilaginous-fish permian-cartilaginous-fish triassic-cartilaginous-fish jurassic-cartilaginous-fish cretaceous-cartilaginous-fish mesozoic-fish-of-europe hasle-formation

Want to explore this topic further?

Ask Mako anything about Lissodus — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report