Nigerinoplica sp.

Baliński, Andrzej, 2002, Frasnian-Famennian brachiopod extinction and recovery in southern Poland, Acta Palaeontologica Polonica 47 (2), pp. 289-305 : 293-294

Nigerinoplica sp.

Fig. 3E–G .

Nigerinoplica sp. ; Baliński 1995a: 34, fig. 6; pl. 2: 8, 10; pl. 5: 9.

Material.— Four fragmentary specimens from set II and three specimens from set III of trench Z−17 .

Remarks.—This species was first described from slightly younger Early Famennian horizons in the Dębnik area by Baliński (1995a). Those previously documented, as well its occurrence outlined here fall within the interval of the Pa. triangularis and lower part of Pa. crepida Zones. The poorly preserved specimens from trench Z−17 are medium sized, with a strongly convex ventral valve. Rare spines are scattered on the ventral valve, situated on elongated spine bases that arise anteriorly from short radial ribs.

The Dębnik specimens are probably conspecific with Productella herminae Frech that is a characteristic fossil from the Elets beds (lower Famennian) of the East European Platform (Markovski and Nalivkin 1934; Sarytcheva and Sokolskaya 1952). Productella herminae was also described by Żakowa (1965) from the lower Famennian of borehole Karniowice 3 situated approximately 6 km to the east of Dębnik. It is also reported by Kościelniakowska (1967) from the Frasnian of the Holy Cross Mountains. Lazarev (1986: 67) first suggested that specimens reported as P. herminae from Russia belong to his new genus Nigerinoplica Lazarev.

Figures

Fig. 3. Early Famennian brachiopods, trench Z−17, Dębnik anticline, Poland. A. Barroisella campbelli Cooper, 1942; partially exfoliated shell Bp 46/48a in dorsal view; × 3. B–D. Praewaaagenoconcha cf. speciosa (Hall, 1867). B. Exterior of the ventral valve Bp 46/20a. C, D. Internal view of two partially exfoliated dorsal valves Bp 46/25a and Bp 46/25b; × 1.5. E–G. Nigerinoplica sp. E, F. Side view of two shells Bp 46/24a and Bp 46/18a. G. Shell Bp 46/24b in dorsal view showing partially removed ventral valve and interior of the dorsal valve; × 1.5. H. Schizophoria (Schizophoria) sp.; incomplete shell Bp 46/37a in dorsal view; × 1.5. I. Rhipidomellid gen. et sp. indet; exterior of poorly preserved ventral valve Bp 46/40; × 2. J.?Ryssochonetes sp.; incomplete shell Bp 46/15 in ventral view; × 15. K. Longispina sp.; poorly preserved shell Bp 46/17z in ventral view; × 5.