Anatomy and relationships of the Middle Permian varanopid <em>Heleosaurus scholtzi</em> based on a social aggregation from the Karoo Basin of South Africa

Botha-Brunk, J. Modesto, S. P. 2009 Anatomy and relationships of the Middle Permian varanopid <em>Heleosaurus scholtzi</em> based on a social aggregation from the Karoo Basin of South Africa Journal of Vertebrate Paleontology 29 389-400 Reptilia Cotylorhynchus Eothyris Archaeothyris Ophiacodon Mycterosaurus Mesenosaurus Elliotsmithia Aerosaurus Varanops Varanodon Archaeovenator Watongia RS_varanopid Pyozia Heleosaurus Osteology Maximum Parsimony Based on reanalysis of the original matrix. Botha-Brink_et_Modesto_2009a