Origen y Evolución de los Dinosaurios

Centro de Estudios Paleontológicos de Chile
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lateral del material holotipo, con fragmentos de
cuerpos vertebrales dorsales, pubis, fémur, tibia,
fíbula y vértebras caudales proximales. Tomado
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Los dedos centrales de la mano de Herrerasaurus terminan en grandes garras
marcadamente curvas, semejantes a las que las aves rapaces presentan en sus
pies. Las garras eran flexionadas por músculos que se insertaban en
prominentes tubérculos proximoventrales. Los dedos externos, atrofiados, eran
inútiles en la manipulación. Cada uno de estos detalles anatómicos concuerda
con los que exhiben otros terópodos primitivos, como Coelophysis, a la par
que diferencian a Herrerasaurus de ornitisquios y saurisquios
sauropodomorfos, en los cuales las manos son más cortas y la atrofia de los
dedos externos no es tan marcada.
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