Biology:Caseodontidae
The Caseodontidae is an extinct family of eugeneodont holocephalans known from the late Paleozoic to earliest Mesozoic of Greenland, Canada and the United States.[1][2] Members of the group are characterized by a reduced or absent palatoquadrate, elongate upper and mandibular rostra, and bulbous, crushing dentition, including a small symphyseal whorl of teeth on the lower jaw and batteries of teeth fused directly to the neurocranium.[3][4] Several genera are known from partial or complete body fossils.[3][5]
Unlike the distantly related helicoprionids, members of this family crossed the Permian-Triassic boundary and persisted into the Olenekian stage of the Early Triassic,[5] after which they became extinct. It is hypothesized that in life caseodonts fed on hard-shelled prey such as brachiopods due to their crushing tooth batteries,[4] and it has been proposed that the elongated rostra on the upper and lower jaws of some genera was an adaptation for prying prey off of the seabed.[6] Well preserved specimens are known from the Carboniferous of Nebraska and Indiana,[3] deposits in East Greenland,[2] and from the Sulphur Mountain Formation of British Columbia, which is the last known appearance of the group.[5]
References
- ↑ "Caseodontidae". https://www.mindat.org/taxon-4825197.html.
- ↑ 2.0 2.1 "Caseodontidae". https://www.gbif.org/species/4825197.
- ↑ 3.0 3.1 3.2 Zangerl, Rainer (1 January 1981). Chondrichthyes 1: Paleozoic Elasmobranchii (Handbook of Paleoichthyology). Friedrich Pfell. ISBN 978-3899370454.
- ↑ 4.0 4.1 Mutter, Raoul; Neuman, Andrew (10 June 2008). "Jaws and dentition in an Early Triassic, 3-dimensionally preserved eugeneodontid skull (Chondrichthyes)". Acta Geologica Polonica 58: 223–227. https://geojournals.pgi.gov.pl/agp/article/view/10007/8537.
- ↑ 5.0 5.1 5.2 Mutter, Raoul J.; Neuman, Andrew G. (2008). "New eugeneodontid sharks from the Lower Triassic Sulphur Mountain Formation of Western Canada". Geological Society, London, Special Publications 295 (1): 9–41. doi:10.1144/sp295.3. ISSN 0305-8719. Bibcode: 2008GSLSP.295....9M. http://dx.doi.org/10.1144/sp295.3.
- ↑ Alexander, Richard R. (1981). "Predation Scars Preserved in Chesterian Brachiopods: Probable Culprits and Evolutionary Consequences for the Articulates". Journal of Paleontology 55 (1): 192–203. ISSN 0022-3360. https://www.jstor.org/stable/1304340.
Template:Holocephali Wikidata ☰ Q20202279 entry
 |  |
