Orbiculatisinurostrum Sartenaer, 1984

Baliński, Andrzej, 2002, Frasnian-Famennian brachiopod extinction and recovery in southern Poland, Acta Palaeontologica Polonica 47 (2), pp. 289-305 : 299

Genus Orbiculatisinurostrum Sartenaer, 1984 Orbiculatisinurostrum laeve ( Gürich, 1903)

Fig. 5C .

Leiorhynchus laevis Gür. ; Gürich 1903: 150, pl. 2: 12, 15. Leiorhynchus laevis Gürich ; Baliński 1979: 47–49; pl. 9: 1–7, fig. 16. Orbiculatisinurostrum laeve (Gürich) ; Baliński and Racki 1999:

fig. 1.7.

Material.—The material coming from trench Z−17 includes 2 complete shells and 68 fragmentary specimens.

Description.—Gürich’s species was re−described under its original generic name by Baliński (1979). In 1984 Sartenaer erected the new genus Orbiculatisinurostrum and designated L. laevis from Dębnik as the type species.

Remarks.—In trench Z−17 Orbiculatisinurostrum laeve appears at the base of the Middle Pa. triangularis Zone , i.e. about 1.3 m above the F–F boundary. It is one of the most abundant brachiopods in this part of the section. It was described earlier by Baliński (1979) from several neighboring outcrops of the Lower Famennian beds: Z−2, Z−3, Z−13, Z−15, and Z−16.

Figures

Fig. 5. Early Famennian brachiopods, trench Z−17, Dębnik anticline, Poland. A, B. Chapinella striata sp. nov. A. Holotype Bp 46/33a in dorsal, ventral, lateral, and anterior views; A5 shows surface microornamentation. B. Shell Bp 46/33b in ventral view. C. Orbiculatisinurostrum laeve (Gürich, 1903); shell Bp 46/28a in dorsal and anterior views. D–J. Pampoecilorhynchus geniculatus sp. nov. D. Juvenile shell Bp 46/52a in dorsal and ventral views. E. Shell Bp 46/52b in dorsal and anterior views. F, G. Two shells Bp 46/52c and Bp 46/52d in dorsal, ventral, lateral, posterior, and anterior views (G, holotype). H. Expanded laterally shell Bp 46/52e in dorsal and posterior views.I. Elongated shell Bp 46/52f in dorsal, posterior, and anterior views. All × 1.5 except A5 × 4.