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Manidens. new Jurassic heterodontosaurid from Argentina



From: Ben Creisler
bh480@scn.org

A new dinosaur:


Diego Pol, Oliver W. M. Rauhut and Marcos Becerra (2011)
A Middle Jurassic heterodontosaurid dinosaur from Patagonia and the
evolution of heterodontosaurids. 
Naturwissenschaften (advance online publication)
DOI: 10.1007/s00114-011-0780-5
http://www.springerlink.com/content/7747k1mm52628161/Online First? 

Abstract 
Heterodontosauridae is a morphologically divergent group of dinosaurs that
has recently been interpreted as one of the most basal clades of
Ornithischia. Heterodontosaurid remains were previously known from the
Early Jurassic of southern Africa, but recent discoveries and studies have
significantly increased the geographical and temporal range for this clade.
Here, we report a new ornithischian dinosaur from the Middle Jurassic
Cañadón Asfalto Formation in central Patagonia, Argentina. This new taxon,
Manidens condorensis gen. et sp. nov., includes well-preserved
craniomandibular and postcranial remains and represents the only diagnostic
ornithischian specimen yet discovered in the Jurassic of South America so
far. Derived features of its anatomy indicate that Manidens belongs to
Heterodontosauridae, as the sister taxon of Heterodontosaurus and other
South African heterodontosaurids. The presence of posterior dentary teeth
with high crowns but lacking extensive wear facets in Manidens suggests
that this form represents an intermediate stage in the development of the
remarkable adaptations to herbivory described for Heterodontosaurus. The
dentition of Manidens condorensis also has autapomorphies, such as
asymmetrically arranged denticles in posterior teeth and a mesially
projected denticle in the posteriormost teeth. At an estimated total length
of 60?75 cm, Manidens furthermore confirms the small size of basal
heterodontosaurids. 

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