MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids
Autor/es:
NOVAS, FERNANDO EMILIO; POL, DIEGO; CANALE, JUAN IGNACIO; PORFIRI, JUAN DOMINGO; CALVO, JORGE ORLANDO
Revista:
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON. SERIES B: BIOLOGICAL SCIENCES.
Editorial:
Royal Society Publishing
Referencias:
Lugar: Londres; Año: 2009 vol. 276 p. 1101 - 1107
ISSN:
0962-8452
Resumen:
Abstract
Fossils of a predatory dinosaur provide novel information about the evolution of unenlagiines, a poorly
known group of dromaeosaurid theropods from Gondwana. The new dinosaur is the largest
dromaeosaurid yet discovered in the Southern Hemisphere and depicts bizarre cranial and postcranial
features. Its long and low snout bears numerous, small-sized conical teeth, a condition resembling
spinosaurid theropods. Its short forearms depart from the characteristically long-armed condition of
all dromaeosaurids and their close avian relatives. The new discovery amplifies the range of morphological
disparity among unenlagiines, demonstrating that by the end of the Cretaceous this clade included large,
short-armed forms alongside crow-sized, long-armed, possibly flying representatives. The new dinosaur is
the youngest record of dromaeosaurids from Gondwana and represents a previously unrecognized lineage
of large predators in Late Cretaceous dinosaur faunas mainly dominated by abelisaurid theropods.