Pentlandina, Bancroft, 1949

Modzalevskaya, Tatiana L., 2003, Silurian and Devonian brachiopods from Severnaya Zemlya (Russian Arctic), Geodiversitas 25 (1), pp. 73-107 : 77-78

Pentlandina ? sp. ( Fig. 4 )

MATERIAL EXAMINED. — A single shell, embedded in rock matrix, from loc. 29a, Lednikovaya River, October Revolution Island ( Männik et al. 2002: fig. 1); Vodopad Formation.

REMARKS

A single small shell (L = 6.7 mm, W = 1.1 mm) with biconvex profile, semielliptical outline, deep ventral sinus, and prominent dorsal sulcus is attributed to Pentlandina ? sp. The hinge line is shorter than the maximum width. The ventral interarea has a large delthyrium, closed by pseudodeltidium. A small chilidium is filled by a bilobate cardinal process. Ornament is parvicostellate with new ribs intercalating. Shells of Pentlandina from the middle Llandovery of West Shropshire have the same size and shape ( Cocks 1968: 293, pl. I, fig. 13). However, the specimens from Severnaya Zemlya lack any sign of the ventral muscle field well visible on the shells from Shropshire.

Family STROPHEODONTIDAE Caster, 1939

Figures

FIG. 4. — Pentlandina? sp., complete shell (N 8/12991), loc. 29a,?Vodopad Formation; A, posterior view; B, ventral view. Scale bar: 5 mm.