Athyris supervittata Tien, 1938

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 : 390-391

Athyris supervittata Tien, 1938

Fig. 13Q–U .

Athyris supervittata Tien (sp. nov.); Tien 1938: 83–84, pl. 11: 7.

Material.—Eleven complete specimens.

Remarks.— Tien (1938) first described this species from the middle Frasnian of the Qiziqiao section. Comparison of our specimens with Tien’s shows that the latter is not a fully mature specimen. Fold and sinus may be very distinct at the anterior margin in mature specimens, with the shell on either side of the fold extended into the ventral valve at various degrees in different individuals. Externally this species is very similar to Pachyplaxoides postgyralea Grunt, 1998 . The latter genus has no dental plates (Grunt in Grunt and Racki 1998). We would rather leave the Chinese species in the genus Athyris before its internal structure is revealed. Our specimens are also very similar to Athyris oehlerti Rigaux, 1908 figured in Brice (1988: pl. 43: 6–10) except that the Hunan specimens are somewhat smaller. Further comparison is needed when more specimens are available.

Occurrence.—Qiziqiao Section, middle Frasnian; in the Shetianqiao and Jiangjiaqiao sections, late Frasnian (early Pa. linguiformis Zone ).

Figures

Fig. 13. A–E. Cyrtospirifer cf. whitneyi (Hall, 1858), sample S−Y−2, PUM 00011, dorsal, anterior, posterior, ventral and lateral views; × 1.5. F–J. Cyrtospirifer? variabilis Ma and Sun, 2001, sample S−25−2. F–I. Ventral, dorsal, posterior and lateral views of holotype PUM 00005; × 2. J. Anterior view of paratype PUM 00013, × 2. K–O. Mennespirifer yangqiaoensis Ma and Sun, 2001, sample S−H−0, lateral, posterior, ventral, anterior, and dorsal views of PUM 00036; × 2. P. Sinospirifer sp.1, sample C7, ventral view of PUM 00040, × 1. Q–U. Athyris supervittata Tien, 1938, sample S−Y−4, posterior, lateral, anterior, dorsal and ventral views of PUM 00047; × 3.