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Lasasaurus, first procolophonid from Triassic of Madagascar



FromL Ben Creisler
bcreisler@gmail.com




A new peper--not a dinosaur, but from a DML member and Mesozoic in age....



Jocelyn Falconnet, Misalalanirina Andriamihaja, Émilie Läng &
J.-Sébastien Steyer (2012)
First procolophonid (Reptilia, Parareptilia) from the Lower Triassic
of Madagascar.
Comptes Rendus Palevol (advance online publication)
http://dx.doi.org/10.1016/j.crpv.2012.04.001
http://www.sciencedirect.com/science/article/pii/S163106831200070X



Lasasaurus beltanae nov. gen. nov. sp., a new procolophonid (Reptilia,
Parareptilia) from the Lower Triassic of Madagascar, is represented by
a single partial skeleton preserved in a ferro-calcareous nodule from
the Middle Sakamena Formation, in the North of the island. This new
taxon is unique in possessing peculiar, fine and dendritic crests
running along the posterolateral side of the squamosal, widely spaced
maxillary teeth, subparallel mesiodistal ridges connecting maxillary
teeth to the tooth row, and a strongly acute anterior margin of the
copula (hyoid bone). This well-preserved specimen belongs to a
juvenile individual. The inclusion of L. beltanae nov. gen. nov. sp.
in a phylogenetic analysis suggests that it is close to Theledectinae,
Procolophoninae, and Leptopleurinae, though their respective
relationships are uncertain. This specimen is the first procolophonid
described from Madagascar and represents a minor terrestrial component
of a coastal vertebrate assemblage dominated by amphibious to
fully-aquatic taxa.