Thrinacodus

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]

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
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	†Phoebodontiformes
Family:	†Phoebodontidae
Genus:	†Thrinacodus St. John and Worthen, 1875
Species
Thrinacodus bicuspidatus Ginter and Sun, 2007 Thrinacodus dziki Ginter et al. 2014 Thrinacodus ferox (Turner, 1982) Thrinacodus gracia (Grogan & Lund, 2008) Thrinacodus incurvus Newberry and Worthen, 1866 Thrinacodus nanus St. John and Worthen, 1875 Thrinacodus tranquillus Ginter, 2000
Synonyms
Thrinacoselache Grogan & Lund, 2008