A new genus and species of seymouriamorph tetrapod from the Lower Permian deposits of the Boskovice Furrow in Moravia (Czech Republic), Spinarerpeton brevicephalum, new genus, new species, is described in detail, and its cranial reconstruction and phylogenetic position within seymouriamorphs is presented. The skeletal anatomy of Spinarerpeton allows this new taxon to be assigned to the family Discosauriscidae (together with Discosauriscus Kuhn, 1933, Makowskia Klembara, 2005, and Ariekanerpeton Ivakhnenko, 1981). It is distinguished from other ?Uppermost Carboniferous-Lower Permian seymouriamorphs, Utegenia Kuznetsov and Ivachnenko, 1981, Ariekanerpeton, Discosauriscus, Makowskia, and Seymouria Broili, 1904, by the following characters: postorbital portion of skull short; postparietal and tabular abbreviated anteroposteriorly; posterior process of jugal long; squamosal high (posterior portion of cheek deep); basioccipital wide and with anteroposteriorly long bilateral processes; exoccipital high and with slender shaft; anterior margin of iliac blade running obliquely anteroventrally to posterodorsally. A phylogenetic analysis places Spinarerpeton as the sister taxon to the Lower Permian Makowskia within the Discosauriscidae.
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