Skenidioides Schuchert and Cooper, 1931

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 : 47

Genus Skenidioides Schuchert and Cooper, 1931 Skenidioides sp.

Fig. 3P.

Material.—Six conjoined valves.

Description.—Shell ventribiconvex, transverse, semioval in outline with maximum width at the hinge line.Cardinal extremities acute.Anterior margin rounded, commissure weakly sulcate.Ventral valve subpyramidal with maximum height at the umbo.Ventral interarea high, triangular, anacline to near catacline with a narrow, triangular, open delthyrium.Dorsal valve gently convex in lateral profile with a shallow, narrow sulcus originating at the umbo.Radial ornament coarsely costate with 12 to 13 rounded ribs.Interior of both valves un − known.

Measurements.—NMW 98.30G.28, complete shell, Lv: 3.8, Ld: 3.4, W: 5.5, T: 2.9.

Remarks.—This unnamed species is somewhat similar to Skenidioides paucicostatus Wright (1964: 212, pl.7: 14–20, 22, 25, 27) from the mid Ashgill Portrane Limestone, of eastern Ireland, in having a coarsely ribbed ornament, but differs in its somewhat less transverse shell outline, acute but not alate cardinal extremities, and in the absence of a ventral median fold.

Occurrence.—Locality 550a.