Rodolfo Coria, Bernardo González Riga y Silvio Casadío
Abstract. New studies of a Hadrosauridae
specimen collected in the Allen Formation, Late Campanian/Early Maastrichthian
from La Pampa Province, Argentina, allow recognizing a new taxon, Lapampasaurus cholinoi gen. et sp. nov.,
which is diagnosed by the following combination of characters: anterior
cervical vertebrae with lateral foramina on the dorsal side of the diapophyses,
scapula with laterally sharp deltoid crest and convex dorsal surface, pedal
ungual phalanx longer than wide with superficial grooves and foramina, and
shallow, longitudinal ventral ridge. The identification of Lapampasaurus as a member of Hadrosauridae is confirmed by the
recognition of several synapomorphies, such as cervical neural arches with
zygapophysial peduncles that elevate above the neural canal, long and dorsally
arched postzygapophyses, coracoid relatively small when compared with the
scapula, with concave anterior margin and well developed bicipital knob, and
hoof-shaped pedal ungual phalanx. The record of Lapampasaurus in the Late
Cretaceous of Patagonia suggests the presence of a more diverse hadrosaurid
fauna than previously recorded.
Coria, R. A., González Riga, B. y Casadío, S. 2012. Un nuevo hadrosáurido (Dinosauria, Ornithopoda) de la Formación Allen, Provincia de La Pampa, Argentina. Ameghiniana 49 (4):552-572.
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