Spinatrypa Stainbrook, 1951

Ma, Xue-Ping, Sun, Yuan-Lin, Hao, Wei-Cheng & Liao, Wei-Hua, 2002, Rugose corals and brachiopods across the Frasnian- Famennian boundary in central Hunan, South China, Acta Palaeontologica Polonica 47 (2), pp. 373-396 : 388

Genus Spinatrypa Stainbrook, 1951 Spinatrypa subkwangsiensis ( Tien, 1938)

Fig. 11A–E .

Atrypa aspera var. subkwangsiensis Tien (var. nov.); Tien 1938: 100–101, pl. 8: 1–4, 17.

Spinatrypa subkwangsiensis (Tien) ; Liu et al. 1982: 198, pl. 144: 7.

Spinatrypa cf. ninghsiangensis Zhao ; Ma 1998: 350, figs. 3, 4A–F.

Spinatrypa sp. A ; Ma 1998: 350, fig. 4G–K.

Material.—Around 200 well preserved shells.

Remarks.—Preliminary study of abundant specimens from the Shetianqiao section shows that S. cf. ninghsiangensis and S. sp. A from the Chongshanpu section ( Ma 1998) probably represent intraspecific variation. When Tien (1938) described the species, he did not designate a holotype. Study of Tien’s type specimens indicates that they may be divided into two morphological groups. Group A is represented by specimens 6280 and 6183 ( Tien 1938: pl. 13: 3, 4) with coarser ribs, wider interspaces, and fewer ribs (no more than 20); group B is represented by specimens 6181 and 6182 ( Tien 1938: pl. 13: 1, 2) with finer and more ribs (around 25). Group A is identical with the Spinatrypa specimens from the Shetianqiao section.

Occurrence.—Widely distributed in central Hunan; Middle to Late Devonian (Frasnian).

Figures

Fig. 11. A–E. Spinatrypa subkwangsiensis (Tien, 1938), sample S−Y−4. A–C. Posterior, ventral and lateral views of PUM 00016; × 2. D, E. Dorsal and posterior views of PUM 00020; × 2. F–O. Iowatrypa? shaodongensis sp. nov., S−Y−4.F–I. Posterior, dorsal, lateral, and ventral views of paratype PUM 00003; × 2. J–N. Posterior, lateral, dorsal, anterior and ventral views of holotype PUM 00004; × 2. O. Ventral view of paratype PUM 00001, × 1.5. P, Q. Iowatrypa? qidongensis Ma, 1998, sample S−Y−4, posterior and ventral views of PUM 00008; × 1.5.