Laevicaspia derzhavini (Logvinenko & Starobogatov, 1969) comb. n.

Fig. 19 f–h

Pyrgula (Ulskia) derzhavini Logv. et Star. — Logvinenko & Starobogatov 1969: 379, fig. 367(9).

Pyrgula derzhavini Logvinenko et Starobogatov, 1968 — Kantor & Sysoev 2006: 99, pl. 45, fig. J.

? Ulskia derzhavini (Logvinenko & Starobogatov, 1969) — Wesselingh et al. 2019: 73.

Type material. Kantor & Sysoev (2006: 99) stated that in ZIN no identified material of this species is found. We detected a lot in the ZIN collection of Starobogatov with six specimens and determined as “ Caspia derzhavini ”. Since this material is a single lot that was labelled by Starobogatov himself it is very likely the type material .

Type locality. Caspian Sea, probably near Cheleken Peninsula (Table 1, locality 21).

Other material. None.

Remarks. The shells of this species have a very slender elongate shape, and the protoconch ornamentation differs largely of that found in Caspiinae, showing irregular spiral threads on a smooth surface. Shape and protoconch features strongly remind of Laevicaspia (Neubauer et al. 2018) . The small size and the short shell with only about five whorls suggest L. derzhavini is a juvenile Laevicaspia, and it might well be a synonym of a previously described Laevicaspia species. This problem cannot be properly solved from the material available for the species, which is why we consider L. derzhavini as a nomen dubium.

Distribution. Middle and South Caspian Sea, 45–81 m (Logvinenko & Starobogatov 1969). Tarasov (1996b) mentioned the species from 311– 870 m.