Short Communication

Naturwissenschaften

, Volume 96, Issue 3, pp 409-414

New carnivorous dinosaur from the Late Cretaceous of NW Patagonia and the evolution of abelisaurid theropods

  • Juan I. CanaleAffiliated withCONICET, Consejo Nacional de Investigaciones Científicas y TécnicasMuseo Municipal “Ernesto Bachmann” Email author 
  • , Carlos A. ScanferlaAffiliated withCONICET, Consejo Nacional de Investigaciones Científicas y TécnicasMuseo Argentino de Ciencias Naturales “Bernardino Rivadavia”
  • , Federico L. AgnolinAffiliated withMuseo Argentino de Ciencias Naturales “Bernardino Rivadavia”Área Paleontología. Fundación de Historia Natural “Félix de Azara”, Departamento de Ciencias Naturales y Antropología, CEBBAD—Universidad Maimónides
  • , Fernando E. NovasAffiliated withCONICET, Consejo Nacional de Investigaciones Científicas y TécnicasMuseo Argentino de Ciencias Naturales “Bernardino Rivadavia”

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Abstract

A nearly complete skeleton of the new abelisaurid Skorpiovenator bustingorryi is reported here. The holotype was found in Late Cenomanian–Early Turonian outcrops of NW Patagonia, Argentina. This new taxon is deeply nested within a new clade of South American abelisaurids, named Brachyrostra. Within brachyrostrans, the skull shortening and hyperossification of the skull roof appear to be correlated with a progressive enclosure of the orbit, a set of features possibly related to shock-absorbing capabilities. Moreover, the development of horn-like structures and differential cranial thickening appear to be convergently acquired within Abelisauridae. Based on the similarities between Skorpiovenator and carcharodontosaurid tooth morphology, we suggest that isolated teeth originally referred as post-Cenomanian Carcharodontosauridae most probably belong to abelisaurids.

Keywords

Patagonia Cretaceous Theropoda Abelisauridae