Spinomarginifera alpha Huang, 1932

Chen, Zhong-Qiang, Campi, Monica J., Shi, Guang R. & Kaiho, Kunio, 2005, Post-extinction brachiopod faunas from the Late Permian Wuchiapingian coal series of South China, Acta Palaeontologica Polonica 50 (2), pp. 343-363 : 355

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.

Figures

Fig. 10. A. Meekella kueichowensis (Huang, 1933), dorsal (A1), ventral (A2), and lateral (A3) views of NMV P309622. B. Chengxianoproductus cf. changxingensis Liao and Meng, 1986, ventral (B1), posterior (B2), lateral (B3), and dorsal (B4) views of NMV P309640 (B); B5, enlargement of fine, densely arranged spine bases of B1. C, D. Spinomarginifera alpha Huang, 1932, lateral (C1), posterior (C2), ventral (C3), and dorsal (D) views of a complete specimen NMV P309643 and a dorsal external mold NMV P309644. E–H. Transennatia gratiosa (Waagen, 1884), ventral (E1, G, H1), anteroventral (E2, H2), posterior (E3, H3), lateral (E4, H4), and internal (F) views of a ventral internal mold NMV P309639 (E), and latex replica NMV P309638 (F) of the ventral internal mold (E –E), a ventral internal mold NMV P309636 (G) and a dorsal external mold NMV P309637 (H –H). A, E, F, G, from the 4th member of the Lungtan For1 4 1 4 mation of Daijiagou; B, from the 1st member of the Lungtan Formation of Daijiagou; C, D, H, from the 5th member of the Lungtan Formation of Daijiagou.