A reassessment of Kelmayisaurus petrolicus, a large theropod dinosaur from the Early Cretaceous of China

• Autorzy: Brusatte S.L. , Benson R. B. J. , Xu X.
• Języki publikacji: EN

Abstrakty

EN

The Early Cretaceous fossil record of large−bodied theropods from Asia is poor, hindering comparison of Asian predatory dinosaur faunas with those from other continents. One of the few large Asian theropod specimens from this interval is a partial skull (maxilla and dentary) from the Lianmugin Formation (?Valanginian–Albian), the holotype of Kelmayisaurus petrolicus. Most authors have either considered this specimen as an indeterminate basal tetanuran or a nomen dubium. We redescribe K. petrolicus and note that it possesses a single autapomorphy (a deep accessory groove on the lateral surface of the anterior dentary), as well as a unique combination of characters that differentiates it from other theropods, affirming its validity. A phylogenetic analysis recovers K. petrolicus as a basal carcharodontosaurid, which is supported by various features: very deep interdental plates (a carcharodontosaurid synapomorphy), fused interdental plates (present in carchardontosaurids and a limited number of other theropods), and the absence of diagnostic features of other clades of large−bodied theropods such as abelisaurids, megalosauroids, and coelurosaurs. As such,Kelmayisaurusis the second known carcharodontosaurid from Asia, and further evidence that this clade represented a global radiation of large−bodied predators during the Early–mid Cretaceous.

Słowa kluczowe

EN

paleontology; Kelmayisaurus petrolicus; large theropod dinosaur; theropod dinosaur; Early Cretaceous; China; Dinosauria; Theropoda; Carcharodontosauridae; anatomy; Cretaceous

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2012
• Tom: 57
• Numer: 1
• Opis fizyczny: p.65-72,fig.,ref.

Twórcy

autor

Brusatte S.L.

• Division of Paleontology, American Museum of Natural History, Central Park West at 7'9th St., New York, NY, 10024, USA

autor

Benson R. B. J.

autor

Xu X.

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