Turricaspia dimidiata

Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine & Wilke, Thomas, 2019, Mollusc species from the Pontocaspian region - an expert opinion list, ZooKeys 827, pp. 31-124 : 83-84

Turricaspia dimidiata (Eichwald, 1838)

*1838 Rissoa dimidiata Eichwald: 156.

?1947 Turricaspia bakuana Kolesnikov: 108, 112.

2006 Pyrgula dimidiata (Eichwald, 1838). - Kantor and Sysoev: 99, pl. 46, fig. K.

?2006 Pyrgula bakuana (Kolesnikov, 1947). - Kantor and Sysoev: 97, pl. 47, fig. C.

2016 Pyrgula dimidiata (Eichwald, 1838). - Vinarski and Kantor: 238.

2016 Pyrgula bakuana (Kolesnikov, 1947). - Vinarski and Kantor: 236-237.

Status. Accepted Pontocaspian species.

Type locality. In fossil limestone of Dagestan, Russia.

Distribution. Middle and southern Caspian Sea ( Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 500 m in the South Caspian Basin of Azerbaijan ( Mirzoev and Alekperov 2017).

Taxonomic notes. Although there is little doubt about the validity of this species, its true identity and possible synonyms are unclear. Eichwald’s (1838) description clearly indicates a slender shell with median keel. His type material is unfortunately unknown. The high number of keeled species complicates an evaluation what is the “true” T. dimidiata and what are synonyms. We tentatively consider Turricaspia bakuana Kolesnikov, 1947 a junior synonym of this species, based on its slender shell with median keel matching Eichwald’s description as well as the prevailing concept of T. dimidiata (compare Kantor and Sysoev 2006). More data are required to support this view.

Conservation status. Not assessed.