Binodicopa Schallreuter, 1972

Pour, Mansoureh Ghobadi, Williams, Mark, Vannier, Jean, Meidla, Tõnu & Popov, Leonid E., 2006, Ordovician ostracods from east central Iran, Acta Palaeontologica Polonica 51 (3), pp. 551-560 : 556

Suborder Binodicopa Schallreuter, 1972 Family Aechminidae Bouček, 1936 Genus Aechmina Jones and Holl, 1869

Type species: Aechmina cuspidata Jones and Holl, 1869 ; Wenlock (Silurian), southern Britain .

cf. Aechmina ? ventadorni Vannier, 1986a

Fig. 3I–L.

Discussion.—Specimens of cf. Aechmina ? ventadorni from the Shirgesht Formation are typically 0.5–0.9 mm long (more than 27 specimens, including NMW 2004.22G.311–328, from samples B−D/3, B−D/4, and B−D/5), and have a length to height ratio ranging from 1.35 to 1.5. Whilst these lie in the size range of specimens from western France, they are generally smaller than the largest French specimens, which are over 1 mm long ( Vannier 1986a: 118). Characteristically though, the Iranian specimens possess a pronounced sulcus anterior of the dorsal spine, a feature which is typical of A.? ventadorni, and which clearly distinguishes this taxon from the North American and British Ordovician species of Aechmina (see Williams et al. 2001).