a new sauropodomorph dinosaur from the early jurassic of patagonia and the origin and evolution of the sauropod-type sacrum一个新的sauropodomorph早期侏罗纪恐龙的巴塔哥尼亚和sauropod-type骶骨的起源和演化.pdfVIP
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a new sauropodomorph dinosaur from the early jurassic of patagonia and the origin and evolution of the sauropod-type sacrum一个新的sauropodomorph早期侏罗纪恐龙的巴塔哥尼亚和sauropod-type骶骨的起源和演化
A New Sauropodomorph Dinosaur from the Early
Jurassic of Patagonia and the Origin and Evolution of the
Sauropod-type Sacrum
1 2 3
Diego Pol *, Alberto Garrido , Ignacio A. Cerda
´ ´ ´
1 Consejo Nacional de Investigaciones Cientıficas y Tecnicas (CONICET), Museo Paleontologico Egidio Feruglio, Trelew, Argentina, 2 Museo Provincial de Ciencias
´ ´ ´
Naturales ‘‘Prof. Dr. Juan A. Olsacher’’, Zapala, Argentina, 3 CONICET-INBIOMA, Museo de Geologıa y Paleontologıa, Universidad Nacjonal del Comahue, Neuquen,
Argentina
Abstract
Background: The origin of sauropod dinosaurs is one of the major landmarks of dinosaur evolution but is still poorly
understood. This drastic transformation involved major skeletal modifications, including a shift from the small and gracile
condition of primitive sauropodomorphs to the gigantic and quadrupedal condition of sauropods. Recent findings in the
Late Triassic–Early Jurassic of Gondwana provide critical evidence to understand the origin and early evolution of
sauropods.
Methodology/Principal Findings: A new sauropodomorph dinosaur, Leonerasaurus taquetrensis gen. et sp. nov., is
described from the Las Leoneras Formation of Central Patagonia (Argentina). The new taxon is diagnosed by the presence
of anterior unserrated teeth with a low spoon-shaped crown, amphicoelous and acamerate vertebral centra, four sacral
vertebrae, and humeral deltopectoral crest low and medially defl
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