Cyrtospirifer bisellatus ( Gürich, 1903 )

Baliński, Andrzej, 2006, Brachiopods and their response to the Early-Middle Frasnian biogeochemical perturbations on the South Polish carbonate shelf, Acta Palaeontologica Polonica 51 (4), pp. 647-678 : 670

Cyrtospirifer bisellatus ( Gürich, 1903)

Fig. 20F, G .

1903 Spirifer Archiaci Murch. var. bisellata Gür. ; Gürich 1903: 141–142, pl. 1: 1–2.

1979 Cyrtospirifer bisellatus ( Gürich, 1903) ; Baliński 1979: 65–66, pl. 16: 1–6; fig. 21.

Material.—One complete shell and seven fragments of disarticulated valves have been recently recovered from the northern quarry near Dębnik (southern Poland).

Remarks.—This species was revised and described in details by Baliński (1979).

Occurrence.— Cyrtospirifer bisellatus is a characteristic element of the brachiopod fauna from the highest beds of the northern quarry near village of Dębnik. It is the oldest representative of the genus in the Upper Devonian strata of the Dębnik anticline and an index species of C. bisellatus local brachiopod Zone (see Baliński 1979).

Figures

Fig. 20. Spiriferid and spiriferinid brachiopods from the Frasnian of Wietrznia and Dębnik. A. Emanuella sp., ZPAL Bp 60/20, damaged shell from the middle Wietrznia Beds of Wietrznia Ie in dorsal (A1), ventral (A2), lateral (A3), posterior (A4), and anterior (A5) views. B. Eleutherokomma zarecznyi (Gürich, 1903), ZPAL Bp 60/9, incomplete shell from the Nodular Limestone (Pa. hassi Zone) of Dębnik in dorsal (B1), ventral (B2), lateral (B3), posterior (B4), and anterior (B5) views. C, D. Tenticospirifer? sp. from the middle Wietrznia Beds of Wietrznia Ie. C. Damaged ventral valve ZPAL Bp 60/24 in ventral (C1) and posterior (C2) views. D. Exterior of incomplete dorsal valve ZPAL Bp 60/25. E. Squamulariina? sp., GIUS 4−273 Wt/IM−6, ventral valve from the middle Wietrznia Beds of Wietrznia Id−W in posterior (E1) and ventral (E2) views. F, G. Cyrtospirifer bisellatus (Gürich, 1903) from the Nodular Limestone (Palmatolepis hassi Zone) of Dębnik. F. Shell ZPAL Bp 60/14 in dorsal (F1), ventral (F2), lateral (F3), posterior (F4), and anterior (F5) views. G. Exterior of large ventral valve ZPAL Bp 60/22.