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
Clade:	†Phoebodontiformes
Genus:	†Thrinacodus; St. John and Worthen, 1875
Species
	Thrinacodus tranquillus Ginter, 2000; Thrinacodus gracia (Grogan & Lund, 2008); Thrinacodus ferox (Turner, 1982); Thrinacodus nanus St. John and Worthen, 1875; Thrinacodus bicuspidatus Ginter and Sun, 2007; Thrinacodus dziki Ginter et al. 2014;
Synonyms
	Thrinacoselache Grogan & 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

^ 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ ^a ^b 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.
^ 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.
^ ^a ^b 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.