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Kelmayisaurus - A Theropod Dinosaur of the Cretaceous

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  • Neal Robbins
        This link has an illustration of Carcharodontosaurus, which is related to Kelmayisaurus. Both are in the family Carcharodontosauridae. The image gives
    Message 1 of 1 , May 1, 2011
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          This link has an illustration of Carcharodontosaurus, which is related to Kelmayisaurus. Both are in the family Carcharodontosauridae. The image gives an idea of how Kelmayisaurus would have looked.
       
          Kelmayisaurus petrocolicus was a theropod dinosaur of the Cretaceous. The systematic paleontology of it is:
       
      Dinosauria Owen 1842
      Saurischia Seeley 1887
      Theropoda Seeley 1881
      Carcharodontosauridae Stromer 1931
      Kelmayisaurus Dong 1973
      Kelmayisaurus petrolicus Dong 1973
       
          S.L. Brusatte, R.B.J. Benson, and Xin Xu wrote an article titled A reassessment of Kelmayisaurus petrolicus, a large theropod dinosaur from the Early Cretaceous of China. It was published in 2011 in Acta Palaeontologica Polonica. This quote from the abstract says:
       
      The Early Cretaceous fossil record of large-bodied theropods from Asia is poor, hindering comparison of Asian predatory dinosaur faunas with those of other continents. One of the few large Asian theropod specimens from this interval is a partial skull (maxilla and dentary) from the Lianmuqin Formation (?Valanginian-Albian), the holotype of Kelmayisaurus petrolicus. Most authors have either considered this specimen as an indeterminate tetanorum 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 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 (present in carcharodontosaurids 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, Kelmayisaurus is the second known carcharodontosaurid from Asia and, further evidence that this clade represented a global radiation of large-bodied predators during the Earl-mid Cretaceous.
       
          Neal Robbins
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