Barroisella Hall and Clarke, 1892

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

Genus Barroisella Hall and Clarke, 1892 Barroisella campbelli Cooper, 1942

Fig. 3A .

Barroisella campbelli new name; Cooper 1942: 228. Barroisella campbelli Cooper, 1942 ; Baliński 1995a: 30, pl. 1: 10, 14, 16.

Material.—Fourteen more or less fragmentary specimens embedded in rock.

Remarks.—The available specimens are characterized by their small longitudinally elliptical shell that tapers posteriorly with poorly preserved internal markings. Internal markings of this species are well known from illustrated specimens from nearby localities ( Baliński 1995a: pl. 1: 10, 14, 16). Of those, the most characteristic internal feature is the dorsal median ridge that bifurcates near mid−valve and enfolds a second short ridge ( Baliński 1995a: pl. 1: 14, 16).

Occurrence.— B. campbelli is known from the Late Devonian of the USA (Indiana, New York). Studies by Baliński (1979, 1995a) indicate that in Poland (at Dębnik) this species ranges from the early Frasnian through the early Famennian ( Pa. crepida Zone ).

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.