Spinatrypina (Exatrypa) cf. explanata ( Schlotheim, 1820 )

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 : 668-669

Spinatrypina (Exatrypa) cf. explanata ( Schlotheim, 1820)

Fig. 18C, D .

cf. 1967 Spinatrypina (Exatrypa) explanata ( Schlotheim, 1820) ; Copper 1967: 125–127, text−figs. 7, 8, pl. 20: 1–4.

1998 Spinatrypina (Exatrypa) explanata ( Schlotheim, 1820) ; Racki and Baliński 1998: 284, fig. 11.

Material.—Two complete neanic shells, six slightly damaged and 22 fragments of shells from Wietrznia Id−W (bed 14) and Ie (beds 29–30, 40, and 171) sections. Three incomplete shells were recovered from loose blocks found a few metres west of Id−W section.

Remarks.—The majority of specimens from Wietrznia represent small−sized shells attaining 10–14 mm in length. Only a few specimens in the present collection are larger but, unfortunately, they are very incomplete and do not warrant a satisfactory description. General shell form and its ornamentation, development of ventral interarea, and wide hinge margin suggest, that specimens from Wietrznia are close to Spinatrypina (Exatrypa) explanata ( Schlotheim, 1820) from Early Frasnian of Germany (see Copper 1967).

Occurrence.—The species were recovered in the lower part of set C at Wietrznia Id−W and Ie sections representing Palmatolepis transitans conodont Zone (Figs. 2, 3).

Figures

Fig. 18. Athyridid and atrypid brachiopods from the Frasnian of Wietrznia and Dębnik. A. Biernatella lentiformis Baliński, 1995, ZPAL Bp 60/5, complete shell from the middle Wietrznia Beds of Wietrznia Ie in dorsal (A1), ventral (A2), lateral (A3), posterior (A4), and anterior (A5) views. B. Atryparia (Costatrypa) sp., GIUS 4−273 Wt/IM−5, from the middle Wietrznia Beds of Wietrznia Id−W in dorsal (B1), ventral (B2), and lateral (B3) views. C, D. Spinatrypina (Exatrypa) cf. explanata (Schlotheim, 1820) GIUS 4−273 Wt/IM−10 (C) and GIUS 4−273 Wt/IM−13 (D) from the middle Wietrznia Beds of Wietrznia Id−W, in dorsal (C1, D1), ventral (C2, D2), and lateral (C3, D3) views. E, F. Spinatrypa semilukiana Ljaschenko, 1959 from the Nodular Limestone (Palmatolepis hassi Zone) of Dębnik. E. Shell ZPAL Bp 60/20 in dorsal (E1) and ventral (E2) views. F. Complete shell ZPAL Bp 60/8 in dorsal (F1), ventral (F2), lateral (F3), posterior (F4), and anterior (F5) views.