Praewaagenoconcha Sokolskaya, 1948

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 : 384-386

Genus Praewaagenoconcha Sokolskaya, 1948 Praewaagenoconcha linglingensis ( Wang, 1956b)

Fig. 9N–R .

Productellana linglingensis sp. nov.; Wang 1956b: 396–398, pl. 8: 1–7. Material.—About 130 well preserved specimens.

Remarks.— Wang (1956b) originally assigned this species to Productellana Stainbrook, 1950 , but did not give any description concerning its internal structures. Productellana is very small, with a few scattered spines on the dorsal valve, whereas the present species has numerous spines. An isolated dorsal valve in our material clearly shows the presence of hinge sockets ( Fig. 9R ) which are narrow and nearly parallel to the posterior margin. Hence it should be assigned to Praewaagenoconcha of the Caucasiproductinae that is characterized by the presence of well−developed teeth and sockets ( Brunton et al. 2000). Praewaagenoconcha linglingensis is similar to Middle Devonian Productella productoides var. sinensis Grabau, 1931 in overall shell form, but in the latter, the spines are coarser and their bases are nearly parallel to the shell surface.

Occurrences.—Central and southern Hunan Province; in the Jiangjiaqiao section, early Famennian ( Pa. triangularis to Pa. crepida zones).

Figures

Fig. 9. A, B. Rhyssochonetes? sp. 1, sample S−Y−2, ventral and dorsal views, PUM 00055; × 3. C–E, S. Rhyssochonetes? sp. 2, sample S−H−0. C. Ventral view, PUM 00062, × 3. D. Dorsal view showing the interarea, PUM 00048, × 5. E. Ventral view, note the orthomorph parallel arranged hinge spines (arrowed), PUM 00061b, × 3. S. Enlargement of arrowed area of E, × 11.5. F–H. Leioproductus hunanensis Liu, 1982, sample C−H, lateral, dorsal and ventral views, PUM 00031, × 2. I. Productella sp. 2, sample C1−0, dorsal view showing some spines present on the valve, PUM 00035, × 3. J, K. Productella lachrymosa var. asiatica Tien, 1938; sample C7. J. Ventral view, PUM 00002, × 1.5. K. Dorsal view, PUM 00032, × 2. L, M. Productella sp. 1, sample S−Y−4.L. Ventral view, PUM 00018, × 2. M. Dorsal view, PUM 00015, × 2. N–R. Praewaagenoconcha linglingensis (Wang, 1956), sample C−H. N. Dorsal view, PUM 00030, × 2. O. Dorsal view, PUM 00034, × 2. P, Q. Ventral and lateral views, PUM 00024; × 2. R. Dorsal interior showing the slit−like sockets, PUM 00059, × 3.3. T–V. Sinalosia rugosa gen. et sp. nov., sample S−Y−2. T. Showing the distinct interarea with ventral pseudodeltidium and dorsal chilidium, which is medially divided by cardinal process as to form a narrow V−shaped slit gap, PUM 01001, × 6. U, V. Lateral and internal views of cardinal process, PUM 01002; × 6.