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
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

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


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