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Opisthodontosaurus, new captorhinid from Lower Permian of Oklahoma



Ben Creisler
bcreisler@gmail.com


A new online paper:

R. R. Reisz, Aaron R. H. LeBlanc, Christian A. Sidor, Diane Scott &
William May (2015)
A new captorhinid reptile from the Lower Permian of Oklahoma showing
remarkable dental and mandibular convergence with microsaurian
tetrapods.
The Science of Nature (advance online publication)
DOI: 10.1007/s00114-015-1299-y
http://link.springer.com/article/10.1007/s00114-015-1299-y

The Lower Permian fossiliferous infills of the Dolese Brothers
Limestone Quarry, near Richards Spur, Oklahoma, have preserved the
most diverse assemblage of Paleozoic terrestrial vertebrates,
including small-bodied reptiles and lepospondyl anamniotes. Many of
these taxa were previously known only from fragmentary remains,
predominantly dentigerous jaw elements and numerous isolated skeletal
elements. The recent discovery of articulated skulls and skeletons of
small reptiles permits the recognition that dentigerous elements,
previously assigned at this locality to the anamniote lepospondyl
Euryodus primus, belong to a new captorhinid eureptile,
Opisthodontosaurus carrolli gen. et sp. nov. This mistaken identity
points to a dramatic level of convergence in mandibular and dental
anatomy in two distantly related and disparate clades of terrestrial
tetrapods and sheds light on the earliest instance of durophagy in
eureptiles.