Sulcatospira Xu, 1979

F. Nikitin, Igor, E. Popov, Leonid & G. Bassett, Michael, 2003, Late Ordovician brachiopods from the Selety river basin, north Central Kazakhstan, Acta Palaeontologica Polonica 48 (1), pp. 39-54 : 51

Genus Sulcatospira Xu, 1979

Sulcatospira prima Popov, Nikitin, and Sokiran, 1999 Figs. 7 , 9G .

Sulcatospira prima Popov, Nikitin, and Sokiran, 1999: 642 , pl.2:

15–16; pl. 3: 11–8; fig. 8.

Holotype: CNIGR Museum (St Petersburg) 17/12986, complete shell.

Type locality: Koskarasu valley, north−central Kazakhstan.

Type horizon: Upper Ordovician, upper Caradoc–lower Ashgill, Angrensor Formation, Koskarasu beds.

Material.—Three conjoined valves, one ventral and two dorsal valves.

Diagnosis.—See Popov, Nikitin, and Solkiran 1999: 642.

Remarks.—Specimens from the Tauken Formation are identical in size, general shell shape, radial ornament, and nature of the ventral sulcus and dorsal median fold with the types of Sulcatospira prima described and illustrated by Popov et al. (1999).

Occurrence.—Localities 550a, 2523 and 5190.

Figures

Fig.7.Transverse serial sections of conjoined valves of Sulcatospira prima Popov, Nikitin, and Sokiran.Distance in mm is measured from the posterior tip of the ventral beak. Dorsal valve uppermost.

Fig.9. A–F. Nalivkinia (Pronalivkinia) zvontsovi sp.nov.; A–E, from sample 5190, F, from sample 2523. A. NMW 98.30G.54, holotype, lateral (A1), anterior (A2), ventral (A3), and dorsal (A4) views of conjoined valves, × 3. B. NMW 98.30G.53, lateral (B1), anterior (B2), ventral (B3), and dorsal (B4) views of conjoined valves, × 2.5. C. NMW 98.30G.55, lateral (C1), anterior (C2), dorsal (C3), and ventral (C4) views of conjoined valves, × 2. D. NMW 98.30G.57, lateral view of incomplete shell showing spiralia, × 3.7. E. NMW 98.30G.56, anterior (E1), dorsal (E2), ventral (E3), and lateral (E4) views of conjoined valves, × 1.7. F. NMW 98.30G.58, lateral view of incomplete shell showing spiralia, × 2.25. G. Sulcatospira prima Popov, Nikitin, and Sokiran; sample 5190; NMW 98.30G.49, lateral (G1), anterior (G2), ventral (G3), and dorsal (G4) views of conjoined valves, × 4.