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In press - Dentition of Amygdalodon
Carballidoa J.L. & Pol D. In press. The dentition of
Amygdalodon patagonicus (Dinosauria: Sauropoda) and the dental evolution
in basal sauropods. Comptes Rendus Palevol.
Received 2 April 2009;
accepted 9 November 2009.
Available online 1 April 2010.
Amygdalodon patagonicus is the oldest record of Sauropoda from South
America and is known from several teeth and fragmentary postcranial
remains. Here we describe in detail its dental morphology, characterized
by the presence of broad spatulated teeth (with low SI values) and the
absence of denticles in their crowns. The enamel bears a particular
wrinkling pattern composed only of apicobasally-aligned pits, which are
frequently joined to each other by a continuous sulcus. Some worn teeth
have large wear-facets that extend over only one of the crown's edges.
This unique combination of characters provides a proper diagnosis for
Amygdalodon. Despite the fragmentary available material, Amygdalodon is
here interpreted as a non-eusauropod sauropod based on the results of a
phylogenetic analysis. The presence of derived dental characters in
Amygdalodon, such as the presence of tooth-tooth occlusion, shows
several features previously thought to diagnose Eusauropoda or
Gravisauria appeared earlier during the early evolution of sauropods.