Thrinacodus

Thrinacodus Temporal range: Late Devonian-Lower Carboniferous Famennian–Serpukhovian PreꞒ Ꞓ O S D C P T J K Pg N
Restoration of T. gracia
Teeth of T. dziki
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	† Phoebodontiformes
Family:	† Phoebodontidae
Genus:	† Thrinacodus St. John and Worthen, 1875
Species
Thrinacodus bicuspidatusGinter and Sun, 2007 Thrinacodus dzikiGinter et al. 2014 Thrinacodus ferox(Turner, 1982) Thrinacodus gracia(Grogan & Lund, 2008) Thrinacodus incurvusNewberry and Worthen, 1866 Thrinacodus nanusSt. John and Worthen, 1875 Thrinacodus tranquillusGinter, 2000
Synonyms
ThrinacoselacheGrogan & Lund, 2008

Thrinacodus is an extinct genus of basal elasmobranch, found worldwide from the Late Devonian-Lower Carboniferous. The type species is Thrinacodus nanus. ^[1] Most species are only known from their tricuspid teeth. T. gracia, originally placed in the separate genus Thrinacoselache from the Serpukhovian-aged Bear Gulch Limestone, of what is now Montana, is known from full body impressions, showing a long, slender eel-like body up to a metre in length, with an elongate rostrum. ^{[2] [3] [4]} Stomach contents of T. gracia include remains of crustaceans and small chondrichthyan fish ( Harpagofututor and Falcatus ). ^[2] It is a member of the Phoebodontiformes. ^[4]

References

1. 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. 19 (1): 1–28. doi:10.26879/583.
2. Grogan, Eileen D.; Lund, Richard (2008). "A basal elasmobranch, Thrinacoselache gracia n. gen and sp., (Thrinacodontidae, new family) from the Bear Gulch Limestone, Serpukhovian of Montana, USA". Journal of Vertebrate Paleontology. 28 (4): 970–988. doi:10.1671/0272-4634-28.4.970. S2CID   84735866.
3. Ginter, Michał; Turner, Susan (2010-12-02). "The middle Paleozoic Selachian genus Thrinacodus" . Journal of Vertebrate Paleontology. 30 (6): 1666–1672. doi:10.1080/02724634.2010.520785. ISSN   0272-4634. S2CID   86058786.
4. Frey, Linda; Coates, Michael; Ginter, Michał; Hairapetian, Vachik; Rücklin, Martin; Jerjen, Iwan; Klug, Christian (2019-10-09). "The early elasmobranch Phoebodus: phylogenetic relationships, ecomorphology and a new time-scale for shark evolution". Proceedings of the Royal Society B: Biological Sciences. 286 (1912): 20191336. doi:10.1098/rspb.2019.1336. ISSN   0962-8452. PMC   6790773 . PMID   31575362.