Tyrannosauroids from the Southern Hemisphere: Implications for biogeography, evolution, and taxonomy

Autor(es)

Delcourt, Rafael ^{[1, 2, 3]} ; Grillo, Orlando Nelson ^[1]

Afiliação do(s) autor(es)

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

^[2] Univ Estadual Campinas UNICAMP, Inst Geociencias, Rua Carlos Gomes 250, BR-13083855 Campinas, SP - Brazil

^[3] Trinity Coll Dublin, Sch Nat Sci, Dept Zool, Dublin - Ireland

• Tipo de documento: Artigo Científico
• Fonte: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY; v. 511, p. 379-387, DEC 15 2018.
• Citações Web of Science: 4

Resumo

Tyrannosauroidea is a well-studied group of carnivorous dinosaurs known mainly from the Late Cretaceous of the Northern Hemisphere. Specimens from Australia (Timimus hermani and the articulated pubes NMV P186046) and Brazil (Santanaraptor placidus) have been referred to this Glade, but their phylogenetic placement is unresolved. Here, we investigated the phylogenetic positions of these Southern Hemisphere specimens within the theropods and among tyrannosauroids using three different phylogenetic datasets: the first covered all major theropod clades, the second was focused on non-Maniraptoriformes Tetanurae, and the third was focused on Tyrannosauroidea. It was found that Santanaraptor and Timimus were tyrannosauroids of a type that was more derived than Dilong paradoxes and more basal than Xiongguanlong baimoensis. However, the pubes NMV P186046 may have phylogenetic relationships among Coelurosauria, probably within Tyrannosauroidea. The resultant topologies, which were associated with temporal and geographical distributions of basal non-proceratosaurid tyrannosauroids, suggest a worldwide cosmopolitan distribution for this Glade (named Pantyrannosauria), at least from the Bajocian-Callovian. Our analyses also support a Late Cretaceous monophyletic Glade of gigantic animals that occurred exclusively in the Northern Hemisphere (named Eutyrannosauria). (AU)

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