Meristina, Hall, 1867

Modzalevskaya, Tatiana L., 2003, Silurian and Devonian brachiopods from Severnaya Zemlya (Russian Arctic), Geodiversitas 25 (1), pp. 73-107 : 101

Meristina ? norilica (Nikiforova in Nikiforova & Andreeva, 1961) ( Fig. 22I )

Meristella norilica Nikiforova in Nikiforova & Andreeva, 1961: 260, pl. LVI, figs 1-11.

Cryptothyrella norilica – Lopushinskaya 1976: 76, pl. XV, figs 1-5.

MATERIAL EXAMINED. — Five crushed specimens from loc. 13, bed 27, loc. 2, beds 61 and 66, Matusevich River, October Revolution Island ( Männik et al. 2002: figs 2, 5); Srednij and Samojlovich formations.

REMARKS

Shells are characterized by rhomboidal outline, low beak, foramen, and apex pressed against dorsal valve. Thickened shelly substance borders the deep pedicle chamber. Ventral surface is smooth and convex. The features above are characteristic of M. norilica described from the Omnutakh Formation of the East Siberia ( Nikiforova & Andreeva 1961: 260, pl. LVI, figs 1-11).

Family ATHYRIDIDAE Davidson, 1881

Figures

FIG. 22. — A-D, Hyattidina remota n. sp.; A, ventral view; B, dorsal view; C, anterior view of a complete shell (holotype N 58/12991); D, lateral view of a complete shell (N 59/12991), loc. 13, bed 48, Golomyannyj Formation; E-H, Greenfieldia orbiculata n. sp.; E, ventral view; F, dorsal view; G, lateral view; H, anterior view of a complete shell (holotype N 62/12991), loc. 2, bed 66, Samojlovich Formation; I, Meristina? norilica (Nikiforova in Nikiforova & Andreeva, 1961), ventral view of a complete shell (N 61/12991), loc. 13, bed 27, Srednij Formation; J-M, Dubaria tenera Nikiforova & T. Modzalevskaya, 1968; J, ventral view; K, dorsal view; L, lateral view; M, anterior view of a complete shell (N 57/12991), loc. 13, bed 89, Vodopad Formation. Scale bars: A-C, E-H, 5 mm; D, J-M, 3 mm; I, 6 mm.