Post-extinction brachiopod faunas from the Late Permian Wuchiapingian coal series of South China Author Chen, Zhong-Qiang Author Campi, Monica J. Author Shi, Guang R. Author Kaiho, Kunio text Acta Palaeontologica Polonica 2005 50 2 343 363 journal article 10.5281/zenodo.13620199 1732-2421 13620199 Spinomarginifera alpha Huang, 1932 Fig. 10C, D . Spinomarginifera kueichowensis mut. a n. sp.; Huang 1932: 60–61 , pl. 5: 12, 13. Spinomarginifera alpha Huang ; Liao 1980b: 259 , pl. 5: 44–47. Locality and horizon : Daijiagou and Chuanmu sections; 5 th member of the Lungtan Formation. Material .— NMV P309643–644. Remarks .—The present species is the largest among the six species described originally by Huang (1932) . It is elongately subrectangular in outline and the hingeline is the widest part of the shell. The ventral umbo is rounded, highly convex, and strongly curved posteriorly. Spinomarginifera alpha is differentiated from S. kueichowensis by its much larger size and more highly convex, posteriorly curved ventral umbo. In addition, when compared with S. alpha , S. pseudosintanensis Huang, 1932 is more strongly rugose and possesses more elongate spine bases on the trails, S. lopingensis is more elongate and ribbed anteriorly, and S. chengyaoyenensis Huang, 1932 is much smaller and more weakly rugose.