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Avenantia and Riebeeckosaurus (Permian dinocephalian therapsids) cranial morphology (free pdf)

From: Ben Creisler

The journal Palaeontologia Africana is being made available online.
It's still a work in progress but some recent papers are now in open

Saniye Güven, Bruce S. Rubidge & Fernando Abdala (2013)
Cranial morphology and taxonomy of South African Tapinocephalidae
(Therapsida: Dinocephalia): the case of Avenantia and Riebeeckosaurus.
Palaeontologia Africana 48: 24-33
URI: http://hdl.handle.net10539/13310

Tapinocephalid dinocephalians comprise a large component of Middle
Permian herbivorous tetrapod biodiversity and are significantly
abundant in the Karoo rocks of SouthAfrica. In order to understand the
effect of the alleged Middle Permian extinction in the terrestrial
record of amniotes a clear understanding of the taxonomic diversity of
this group is essential. The tapinocephalids Avenantia kruisvleiensis
and Riebeeckosaurus longirostris have in the past been distinguished
by a set of characters, including differences in the snout length
which was previously interpreted as a key diagnostic character.
Further preparation of the material attributed to these species shows
that the purported distinguishing characters, such as snout length,
low intertemporal crest, and surface thickening of the parietal
represent postmortem deformation (including distortion and weathering)
or can be interpreted as individual or ontogenetic variation.
Accordingly A. kruisvleiensis is synonimized with R. longirostris.