Data from: A new species of burnetiid (Therapsida, Burnetiamorpha) from the early Wuchiapingian of South Africa and implications for the evolutionary ecology of the family Burnetiidae.

Burnetiidae is a family of basal therapsids that is known from late Permian-aged (Lopingian) sequences from southern and eastern Africa and European Russia. Recent discoveries of related genera within the broader clade Burnetiamorpha have added to our understanding of morphological variation in the group but have eroded the list of characters defining the family Burnetiidae. We describe a new burnetiid taxon, Leucocephalus wewersi gen. et sp. nov., and argue that Burnetiidae can be defined by, among other characters, the presence of two bosses on the ventrolateral surface of suborbital bar and zygomatic arch, high skull angulation between the orbits, and a median frontal crest that becomes wider and lower posteriorly. The new specimen was found in the early Wuchiapingian Tropidostoma Assemblage Zone of the Main Karoo Basin and, along with previous discoveries, indicates that the family reached its greatest diversity and abundance in the early Wuchiapingian. Diversity declined into the later Wuchiapingian and Changhsingian. Although the clade Burnetiamorpha, including the family Burnetiidae, contains at least 11 genera, each of these is exceptionally rare, with most represented by only one specimen. This could be attributed to a genuine ecological characteristic or may be the result of biogeographic factors, particularly if the Main Karoo Basin was on the periphery of their range.

巴诺兽科（Burnetiidae）是一类基干兽孔类，其化石记录来自非洲南部、东部以及俄罗斯欧洲区域的晚二叠世（乐平统）地层序列。近年来，在更广域的巴诺莫兽类分支（Burnetiamorpha）内发现的相关属种，既加深了我们对该类群形态变异的认知，也使得巴诺兽科的鉴别特征清单有所缩减。
本文记述了一个全新的巴诺兽科分类单元：Leucocephalus wewersi gen. et sp. nov.，并提出巴诺兽科可通过下述特征（及其他鉴别性状）予以界定：眶下棒与颧弓的腹外侧表面具两处隆起、眶间头骨倾角显著、以及一处向后逐渐变宽变低的正中额脊。
该新标本发现于主卡鲁盆地吴家坪阶早期的弯齿兽组合带中，结合此前的化石发现，表明巴诺兽科在吴家坪阶早期达到了多样性与丰度的巅峰，随后在吴家坪阶晚期及长兴阶阶段出现多样性衰减。
尽管巴诺莫兽类分支（包含巴诺兽科）至少涵盖11个属，但每个属的化石记录都极为稀少，多数属仅知一件标本。该现象既可能源于该类群真实的生态特性，也可能受生物地理因素影响——尤其是主卡鲁盆地或许处于该类群分布范围的边缘地带。