Productella sp. 1

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

Productella sp. 1

Fig. 9L, M .

Material.— 25 specimens, most of which are poorly preserved.

Remarks.—This form is characterized by small size, surface with rugae and growth lines. Spines are only present on the ventral valve. Both ventral and dorsal interareas are slit−like. These specimens have a more transverse outline and more numerous spines on the ventral valve than Productella shetienchiaoensis Tien, 1938 . Tien’s species is much smaller than P. sp. 1, with a width around 6.5 mm (not “natural size” as in Tien’s plate explanation).

Occurrence.—In the Shetianqiao section occurring at several horizons; late Frasnian.

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.