Trucidocynodon

Trucidocynodon is an extinct genus of ecteniniid cynodonts from Upper Triassic of Brazil.[1] It contains a single species, Trucidocynodon riograndensis. Fossils of Trucidocynodon were discovered in Santa Maria Formation outcrops in Paleorrota geopark Agudo. T. riograndensis was similar to Ecteninion lunensis from the Upper Triassic Ischigualasto formation of Argentina, but differed in several respects, including its larger size. It is known from a nearly complete holotype skeleton as well as a referred skull. The holotype skeleton had an estimated length of 1.2 meters (4 feet), while the referred skull was 17% larger than that of the holotype. Trucidocynodon is considered one of the largest known carnivorous cynodonts from the Triassic, as well as one of the largest probainognathians in the entire Mesozoic.[1][2]

Trucidocynodon
Temporal range: Late Triassic, 220 Ma
Trucidocynodon riograndensis.jpg
Restoration
Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Therapsida
Clade: Cynodontia
Family: Ecteniniidae
Genus: Trucidocynodon
Oliveira et al. 2010
Type species
Trucidocynodon riograndensis
Oliveira et al. 2010

A biomechanical study has argued that Trucidocynodon not only had erect limbs, but that it also possibly had digitigrade forelimbs, being among the first synapsids to show adaptations for cursoriality. However, it was likely not a specialized runner, unlike ungulates and some other modern cursorial mammals.[3]

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ReferencesEdit

  1. ^ a b Oliveira, T.V.; Soares, M.B.; Schultz, C.L. (2010). "Trucidocynodon riograndensis gen. nov. et sp. nov. (Eucynodontia), a new cynodont from the Brazilian Upper Triassic (Santa Maria Formation)". Zootaxa. 2382: 1–71. doi:10.11646/zootaxa.2382.1.1.
  2. ^ Stefanello, Micheli; Müller, Rodrigo Temp; Kerber, Leonardo; Martínez, Ricardo N.; Dias-Da-Silva, Sérgio (2018-08-09). "Skull anatomy and phylogenetic assessment of a large specimen of Ecteniniidae (Eucynodontia: Probainognathia) from the Upper Triassic of southern Brazil". Zootaxa. 4457 (3): 351–378. doi:10.11646/zootaxa.4457.3.1. ISSN 1175-5334.
  3. ^ Téo Veiga, De Oliveira; Leandro Schultz, Cesar (2016). "Functional morphology and biomechanics of the cynodont Trucidocynodon riograndensis from the Triassic of Southern Brazil: Pectoral girdle and forelimb". Acta Palaeontologica Polonica. 61 (2): 377–386. doi:10.4202/app.00171.2015.