The skull anatomy of Decuriasuchus quartacolonia (Pseudosuchia: Suchia: Loricata) from the middle Triassic of Brazil

Autor(es)

De Franca, Marco A. G. ; Langer, Max C. ; Ferigolo, Jorge ; Nesbitt, SJ ; Desojo, JB ; Irmis, RB

• Tipo de documento: Artigo Científico
• Fonte: ANATOMY, PHYLOGENY AND PALAEOBIOLOGY OF EARLY ARCHOSAURS AND THEIR KIN; v. 379, p. 33-pg., 2013-01-01.

Resumo

Unlike most rauisuchians, which are known based on partially preserved specimens, fossils attributed to Decuriasuchus quartacolonia include a monotaxonomic assemblage composed of nine associated individuals (MCN-PV10.105a-i), three with almost complete skulls (MCN-PV10.105a,c,d), and a partial disarticulated skull (MCN-PV10.004) collected in the Middle Triassic (Ladinian, Dinodontosaurus Biozone) beds of the Santa Maria Formation, in south Brazil. Because of its completeness and possible phylogenetic position, as one of the most basal loricatans, D. quartacolonia is a key taxon for anatomic, evolutionary and biomechanical studies of rauisuchians. The comparative description of its osteology reveals that the skull and mandible of D. quartacolonia are very similar to those of cf. Prestosuchus chiniquensis and Saurosuchus galilei, sharing a drop-shaped subnarial fenestra, a subtriangular antorbital fenestra with an elongated and narrow anterior point, a 'roman nosed' nasal, and a posteroventrally oriented ridge on the lateral surface of the ventral ramus of the squamosal. Among the differences are the autapomorphies of D. quartacolonia: numerous maxillary teeth (17), lateral expansion of the nasal/lacrimal covering the antorbital fenestra dorsally, and squamosal and quadratojugal forming a subtriangular projection that invades the lower temporal fenestra. (AU)

• Processo FAPESP: 07/54695-9 - Revisão sistemática e filogenética dos Rauishuchia (Archosauria: Pseudosuchia) com descrição de novos materiais do Triássico do Rio Grande do Sul (Formação Santa Maria)
• Beneficiário: Marco Aurélio Gallo de França
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 09/54645-7 - Vertebrados permo-triássicos das Bacias do Paraná e Parnaíba: filogenia e correlações estratigráficas
• Beneficiário: Max Cardoso Langer
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/23834-9 - Archosauriformes não ornitossúquios do Triássico brasileiro: anatomia, taxonomia e filogenia
• Beneficiário: Marco Aurélio Gallo de França
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado