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new mid-jurassic sauropod: Archaeodontosaurus
ERIC BUFFETAUT. 2005. A new sauropod dinosaur with prosauropod-like teeth from
the Middle Jurassic of Madagascar. Bulletin de la Société Géologique de France,
Key words. - Dinosauria, Sauropoda, Middle Jurassic, Madagascar.
Abstract. - A dentary bone containing several teeth, from the Middle Jurassic
(Bathonian) of northwestern Madagascar is described as the type of a new
sauropod dinosaur taxon, Archaeodontosaurus descouensi, n.g., n.sp. This taxon
is characterised by the unusual combination of a dentary with a deep anterior
part, as in advanced sauropods, and teeth with large serrations and a convex
lingual side, which resemble the teeth of prosauropods. A more common pattern
in early sauropods is the combination of a low, prosauropod-like dentary and
spoon-shaped, sauropod-like teeth. Although the condition in Archaeodontosaurus
descouensi strongly suggests that basal sauropods had prosauropod-like teeth,
what is known of the jaw and dentition in various early and middle Jurassic
sauropods indicates mosaic evolution along different paths during the early
diversification of the group. Archaeodontosaurus descouensi differs from
Jurassic sauropod material from Madagascar, previously described a!
s Bothriospondylus and Lapparentosaurus, which needs revision. It appears that
at least two distinct sauropods, with different tooth morphologies, are present
in the Middle Jurassic of Madagascar.