The earliest dromaeosaurid theropod from South America

Peter J. Makovicky (), Sebastián Apesteguía () and Federico L. Agnolín
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Peter J. Makovicky: The Field Museum
Sebastián Apesteguía: Sección de Paleontología de Vertebrados
Federico L. Agnolín: Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’

Nature, 2005, vol. 437, issue 7061, 1007-1011

Abstract: Drifting apart Sickle-clawed predatory dinosaurs, known as dromaeosaurids, are close relatives of birds. Until a decade ago, members of this group such as Velociraptor were known only from northern continents, but a few fragmentary specimens have been found in the Southern Hemisphere in recent years. The cover shows a life reconstruction of Buitreraptor gonzalezorum, a newly discovered dromaeosaurid from La Buitrera in Patagonia, which is known from a nearly complete specimen. It is geologically oldest of the southern dromaeosaurids, and its completeness provides evidence that they are a distinct lineage that split from their northern relatives after the breakup of the supercontinent Pangaea towards the end of the Jurassic. The individual in the foreground is shown holding a juvenile Priosphenodon (see Nature 425, 609–612; 2003), a relative of the living tuatara, and another relict of a group with a global Jurassic distribution.

Date: 2005
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DOI: 10.1038/nature03996

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