Eoplectodonta sp.

Hints, Linda & Harper, David A. T., 2015, The Hirnantian (Late Ordovician) brachiopod fauna of the East Baltic: Taxonomy of the key species, Acta Palaeontologica Polonica 60 (2), pp. 395-420 : 404

Eoplectodonta sp.

Fig. 8B .

Material.— Eight specimens embedded in rock. Porkuni Regional Stage , Kuldiga Formation , Hirnantian ( Upper Ordovician ); southwestern Estonia and western Latvia. Drill core and depths (in meters) of sample with brachiopod. Collection GIT 542 : Ikla, 534.7, 539.6; Stirnas-18, 911.9, 912.2, Riekstini-15, 861.85; Aispute-41, 983.25 .

Remarks.—Poorly-preserved sowerbyellid brachiopods are tentatively assigned to the genus Eoplectodonta . The shells are relatively small, transversally semioval, up to about 13 mm wide at the hinge line and 6–7 mm long; cardinal angles acute. Ventral valve weakly convex, dorsal one concave. Radial ornament consists of a few strong ribs with about 7 fine costellae between them on the anterior margin of the valve. Interiors, including the occurrence of hinge denticles, unknown. The Baltic specimens are similar to Eoplectodonta (Eoplectodonta) sp. nov. 1 ( Cocks 2005) from the Boda Limestone in Sweden in their small size, however, they differ in having more accentuated costae.

Figures

Fig. 8. Plectambonitoid brachiopods from the Kuldiga Formation of the Porkuni Regional Stage, Hirnantian (Upper Ordovician), East Baltic, western Latvia. A. Leangella sp., shell, GIT 542-222, Riekstini-15, depth 859.3 m, ventral (A1), dorsal (A2), and lateral (A3) views. B. Eoplectodonta sp., incomplete ventral valve, GIT 542-21, Stirnas-18, 911.9 m, ventral view.