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The Early Permian Reptile Acleistorhinus pteroticus and Its Phylogenetic Position

Michael Debraga and Robert R. Reisz
Journal of Vertebrate Paleontology
Vol. 16, No. 3 (Sep. 19, 1996), pp. 384-395
Stable URL: http://www.jstor.org/stable/4523731
Page Count: 12
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The Early Permian Reptile Acleistorhinus pteroticus and Its Phylogenetic Position
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Abstract

Restudy of Acleistorhinus pteroticus indicates that this Early Permian amniote from North America is the oldest known member of Parareptilia. Despite its stratigraphic position, Acleistorhinus is not a basal parareptile, and a phylogenetic analysis of parareptile interrelationships demonstrates that Acleistorhinus is a sister taxon to the Russian clade Lanthanosuchidae. This hypothesis of relationships is supported by eleven synapomorphies. The presence of an Early Permian parareptile in North American sediments provides strong support for the recent hypotheses of amniote phylogeny that propose an extensive evolutionary radiation for this group of reptiles.

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