Amphistrophia (Amphistrophia) Hall and Clarke, 1892

Musteikis, Petras & Cocks, L. Robin M., 2004, Strophomenide and orthotetide Silurian brachiopods from the Baltic region, with particular reference to Lithuanian boreholes, Acta Palaeontologica Polonica 49 (3), pp. 455-482 : 462

Genus Amphistrophia (Amphistrophia) Hall and Clarke, 1892

Remarks.—The type species, Amphistrophia (A.) striata (Hall), is from the Wenlock of New York State, U.S.A. A common species in Baltica is A. (A.) funiculata ( M’Coy, 1846) , whose type locality is in the Upper Wenlock of England, it is known from the Wenlock Slite and Mulde Beds of Gotland ( Bassett and Cocks 1974: 16) and elswhere. The genus is rare in Lithuania, but one poorly preserved specimen from the Svėdasai−252 borehole of eastern Lithuania shows unequally parvicostellate ribbing different from the more equal parvicostellae of A. (A.) funiculata . We have identified A. (A.) funiculata itself, and the species is figured here ( Fig. 5E), from the Birđtonas Formation (Homerian) in east Lithuania and the Mituva Formation (Ludfordian) in west Lithuania. Nikiforova et al. (1985) reassigned Strophomena podolica Siemiradzki, 1906 , from the Lower Devonian of Podolia, to Amphistrophia : it was also revised by Kozłowski (1929: 101). Rybnikova (1966: 87; 1967: 194) recorded that species from the Ludlow of the Latvian boreholes, but her illustrations appear unidentifiable and we cannot confirm the species as present in the Silurian of Latvia.