Reassessment of a fragmentary maxilla attributed to Carcharodontosauridae from Presidente Prudente Formation, Brazil

Autor(es)

Delcourt, Rafael ^[1] ; Grillo, Orlando Nelson ^[2]

Afiliação do(s) autor(es)

^[1] Trinity Coll Dublin, Dept Zool, Dublin 2 - Ireland

^[2] Univ Fed Rio de Janeiro, Dept Geol & Paleontol, Museu Nacl, BR-20940040 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CRETACEOUS RESEARCH; v. 84, p. 515-524, APR 2018.
• Citações Web of Science: 4

Resumo

Carcharodontosauridae and Abelisauridae are two coexisting clades of theropod dinosaurs from the Cretaceous of Africa, South America and possibly Europe. The oldest and most recent carcharodontosaurid remains are from the Kimmeridgian-Tithonian of Africa and Turonian of South America, respectively. Recently, a fragmented maxilla bearing a single in-situ tooth (UFRJ-DG409-R) from the Maastrichtian of Brazil has been interpreted as belonging to a carcharodontosaurid. We here reassessed the phylogenetic distribution of these material using morphological, morphometric and phylogenetic analyses. If the morphology of the tooth is shared with carcharodontosaurids and abelisaurids, the morphometric analyses found the crown in the same morphospace as abelisaurids, and the phylogenetic analysis performed on a dentition-based datamatrix retrieved it among Abelisauridae. The maxilla also shares features with both groups, yet the horizontal striations on the paradental plates of UFRJ-DG409-R support abelisaurid affinities. Our data strongly suggest that these specimens belong to abelisaurid theropods, supporting the fact that carcharodontosaurids were likely extinct from Coniacian. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/09370-2 - Evolução morfológica de Ceratosauria e Tyrannosauroidea (Dinosauria: Theropoda)
• Beneficiário: Rafael Delcourt de Seixas Ferreira
• Linha de fomento: Bolsas no Brasil - Doutorado