Brachiosuchus kababishensis, a new long-snouted dyrosaurid (Mesoeucrocodylia) from the Late Cretaceous of north central Sudan

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作   者：

Salih, Khalafallah O.;  Evans, David C.;  Bussert, Robert;  Klein, Nicole;  Mueeller, Johannes; 

作者机构：

Royal Ontario Museum;  Univ Bonn;  Al Neelain Univ;  Tech Univ Berlin;  Leibniz Inst Evolut & Biodiversitatsforsch Invali; 

关键词：

PALEOCENE;  ARCHOSAURIA;  ASSEMBLAGE;  biogeography;  Sudan;  CROCODYLIFORMES;  MOROCCO;  DINOSAURS;  BEDS;  Dyrosaurids;  latest Cretaceous;  CROCODYLOMORPHA;  EOCENE;  phylogeny;  East Africa;  REMAINS; 

期刊名称：

Historical Biology: an international journal of paleobiology

i s s n：

0891-2963

年卷期：

2022 年 34 卷 4/6 期

页   码：

821-840

页   码：

摘   要：

Here we report on a new dyrosaurid from the latest Cretaceous Kababish Formation, Sudan, which was previously unknown to yield fossil macrovertebrates and had remained largely unstudied. The almost complete, partially articulated skeleton was recovered in situ near Jebel Abyad. The skeleton is almost 7 m in length and preserves an almost complete skull and partly articulated postcranium with several disarticulated osteoderms. The material is assigned to Dyrosauridae based on the presence of elongate supratemporal fenestrae, occipital tuberosities, and a reduced seventh alveolus on the mandible. Morphological features of the skull and mandible differ from other members of this family suggesting that this taxon represents a new genus and species of dyrosaurid. A unique feature of the new taxon is that the humerus is wedge-shaped and longer than femur. Phylogenetic analyses using parsimony and Bayesian inference posit that the new taxon is deeply nested in Dyrosauridae as a sister taxon to a clade including Arambourgisuchus, Dyrosaurus, Acherontisuchus, Hyposaurus, Congosaurus, Rhabdognathus, Atlantosuchus, and Guarinisuchus. The occurrence of the new dyrosaurid within the Kababish Formation potentially extends the temporal range of the Dyrosauridae to the Campanian and supports previous hypotheses of an African origin for this family.