The first Jurassic theropod from the Sergi Formation, Jatoba Basin, Brazil

Autor(es)

Bandeira, Kamila L. N. ^[1] ; Brum, Arthur S. ^[2] ; Pegas, V, Rodrigo ; de Souza, Lucy G. ^[3] ; Pereira, Paulo Victor Luiz G. C. ^[4] ; Pinheiro, Andre Eduardo P. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio de Janeiro, Dept Geol & Paleontol, Museu Nacl, Quinta Boa Vista S-N, BR-20940040 Rio De Janeiro, RJ - Brazil

^[2] Univ Fed Rio de Janeiro, Dept Geol & Paleontol, Museu Nacl, Lab Paleobiol & Paleogeog Antartica, Quinta Boa Vista S-N, BR-20940040 Rio De Janeiro, RJ - Brazil

^[3] Museu Amazonia MUSA, Margarita 6305, BR-10795265 Manaus, Amazonas - Brazil

^[4] Univ Fed Rio de Janeiro, Dept Geol, CCMN, Lab Macrofosseis, Av Athos da Silveira Ramos 274, BR-21941611 Rio De Janeiro, RJ - Brazil

^[5] Univ Estado Rio de Janeiro, Fac Formacao Prof, Dept Ciencias UERJ FFP DCIEN, Campus Sao Goncalo, Rua Dr Francisco Portela 1470, BR-24435005 Sao Goncalo, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 93, n. 2 2021.
• Citações Web of Science: 0

Resumo

Archosaur osteological remains are abundant in Brazil, particularly from the Triassic and Cretaceous strata, but in Jurassic, the record is predominantly represented by ichnofossils. The Upper Jurassic archosaur records comprise the Paralligatoridae Batrachomimus pastosbonensis, from the Pastos Bons Formation (Parnaiba Basin), remains of Mesoeucrocodylia from the Alianca Formation (Jatoba . Basin), and fragments of Dinosauria from the Brejo Santo Formation (Araripe Basin) with a dubious assignment Here, we present the first undoubted Dinosauria record for the Jurassic of Brazil, MCT 2670-LE, a middle to distal caudal vertebra belonging to a theropod. MCT 2670-LE was excavated in the 60s by prof. Ignacio Machado Brito, being primarily attributed to strata of the Alianca Formation but the rock matrix involving the specimen allows us to correlate MCT 2670-LE to Sergi Formation, marking this specimen as the first archosaur record of this unit. The caudal vertebra is assigned to Carcharodontosauria based on the hourglass shaped centrum and the deep and narrow ventral groove. The specimen provides new data to the paleogeographic distribution of carcharodontosaurians before the South America-Africa break-up, as well as understanding the theropod faunal turnover of paleoenvironments during the Jurassic-Cretaceous transition in Brazil. (AU)

• Processo FAPESP: 19/10231-6 - Biomecânica da postura da asa em voo de Anhanguera piscator e Tupuxuara leonardii (Pterosauria: Pterodactyloidea) e considerações acerca da evolução do voo no grupo
• Beneficiário: Rodrigo Vargas Pêgas
• Linha de fomento: Bolsas no Brasil - Doutorado