Nematocrania 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 : 494

Nematocrania sp.

Fig. 5H, I, L, N.

Material.—One complete and two fragmentary dorsal valves.

Remarks.—Similar to N. pilea , the specimens described here are characterized by having radial costellate ornamentation. However, the costellae of Nematocrania sp. are different being closely spaced and separated by very narrow, albeit very deep furrows. The costellae are high and rounded in cross section causing them to seem slightly narrower at the base and wider at the mid−height. Tops of the costellae are transversely crenulated. They increase in number by very rare intercalations and branching, attaining up to 88–92 in total (in N. pilea there are 27–57 costellae). There is no evidence of a presence of spinous projections or disruption of the costellae by the growth lamellae in Nematocrania sp. Most probably the specimens described here represent new species but the material is inadequate to warrant a full description.

Stratigraphic and geographic range.—All three specimens were found in sample GB which was collected at Gedongguan locality.