The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution Author Reisz, Robert R. Author Müller, Johannes Author Tsuji, Linda Author Scott, Diane text Zoological Journal of the Linnean Society 2007 2007-09-30 151 1 191 214 https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00312.x journal article 4384 10.1111/j.1096-3642.2007.00312.x 1339ad9b-f051-4055-ad11-05e6d4245392 0024-4082 5431970 BELEBEY VEGRANDIS IVAKHNENKO, 1973 Holotype : PIN ( Palaeontological Institute , Russian Academy of Science , Moscow , Russia ) 104/50 maxillary bone with partly preserved palatine bone. Referred specimens: SGU ( Saratov Geological University, Saratov , Russia ) 104/B-2020, a small complete skull that has been disarticulated ( Figs 1–6 ); SGU 104/B-2021, a slightly larger, complete skull ( Figs 7 , 8 ); SGU 104/B-2022, a large, partial skull, preorbital region not preserved. This large individual was available for study but could not be illustrated . Horizon and locality: Upper Kazanian, Middle Permian; Bashkortostan and Orenburg regions, Southern Russia . Diagnosis: Bolosaurid parareptiles characterized by the presence of strongly procumbent incisiform dentition anteriorly, and linguo-labially elongated, bulbous, posterior cheek teeth with strongly developed longitudinal striations. Non-dental potential autapomorphies cannot be recognized because most of the other bolosaurid taxa are known from fragmentary cranial and mandibular elements.