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Batrachomimus, new neosuchian from Jurassic of Brazil



From: Ben Creisler
bcreisler@gmail.com

A new online paper:

Felipe C. Montefeltro, Hans C. E. Larsson, Marco A. G. de França & Max
C. Langer (2013)
A new neosuchian with Asian affinities from the Jurassic of northeastern Brazil.
Naturwissenschaften (advance online publication)
DOI: 10.1007/s00114-013-1083-9
http://link.springer.com/article/10.1007/s00114-013-1083-9

Phylogenetic relationships near the origin of extant crocodylians are
weakly supported, and this lack of resolution makes for poor estimates
of taxonomic and morphological diversity. Previously known taxa are
found throughout the Cretaceous in Laurasia and at a few sites from
Brazil, Australia, and northern Africa. Here, we report Batrachomimus
pastosbonensis gen. et sp. nov. from the Late Jurassic of northeastern
Brazil, which is deeply nested within Neosuchia and associated to the
Cretaceous Asian paralligatorids. The new taxon predates all other
members of Paralligatoridae and its immediate sister group (including
Eusuchia) by 30 million years. A nearly complete skull, osteoderms,
and limb bones were recovered, and autapomorphies of B. pastosbonensis
include a scalloped lateral margin of the rostrum in dorsal view,
unsculpted alveolar margin at the caudalmost portion of the maxilla,
blunt lateral prongs on the jugal at the base of the postorbital bar,
hourglass shaped choanae, and pterygoid choanal septum extended
between the palatal shelves of the palatines. The crocodyloid-like
skull proportions and the slender, conical teeth suggest an amphibious
and piscivorous life history to this 1 m long animal.