Serratocrista sp.

Sun, Yuanlin & Baliński, Andrzej, 2008, Silicified Mississippian brachiopods from Muhua, southern China: Lingulids, craniids, strophomenids, productids, orthotetids, and orthids, Acta Palaeontologica Polonica 53 (3), pp. 485-524 : 515

Serratocrista sp.

Fig. 23 .

1999 Orthotetidine gen. et sp. indet.; Baliński 1999: 441, fig. 3R, S.

Material.—Five fragmentary dorsal valves, one ventral valve, and three indeterminable fragments.

Remarks.—The specimens reveal characteristic cardinalia, parvicostellate ornamentation by intercalation, and arrays of short, spinous projections along the crest of costellae. Cardinal process is low, bilobed, with a very weakly marked median boss. Socket ridges are slightly recurved, diverging from hinge at about 22 °.

The specimens from the Muhua Formation are comparable to Serratocrista in having similar external ornamentation and dorsal interior structure but their fragmentary preservation is insufficient to permit a specific assignment.

Stratigraphic and geographic range.—This is a rare species in samples D4, GB, MH1, M2/3, and M2/4.

Figures

Fig. 23. Orthotetoid brachiopod Serratocrista sp. from the Muhua Formation. A, B. Young ventral valves, PKUM02−0322 (A) and PKUM02−0323 (B), in exterior (A1, B1), interior (A2, B2), and posterior (A3, B3) views. C. Slightly damaged dorsal valve, PKUM02−0324, in exterior (C1) and interior (C2) views. D. Incomplete ventral valve, PKUM02−0325, in exterior (D1) and interior (D2) views. Sample D4 (A, C) and GB (B, D).