Laevicaspia derzhavini ( Logvinenko & Starobogatov, 1969 ) Anistratenko & Neubauer & Anistratenko & Kijashko & Wesselingh, 2021

Anistratenko, Vitaliy V., Neubauer, Thomas A., Anistratenko, Olga Yu., Kijashko, Pavel V. & Wesselingh, Frank P., 2021, A revision of the Pontocaspian gastropods of the subfamily Caspiinae (Caenogastropoda: Hydrobiidae), Zootaxa 4933 (2), pp. 151-197 : 186

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.

Figures

FIGURE 19. Species no longer considered Caspiinae. (a–e) Laevicaspia obventicia (Anistratenko in Anistratenko & Prisjazhnjuk, 1992), holotype (IZAN, no number). (f, g) Laevicaspia derzhavini (Logvinenko & Starobogatov, 1969), probable paratype, locality 21 (ZIN, no number). (h–k) L. derzhavini, probable paratype, locality 21 (ZIN, no number). Scale bars = 1 mm (a–c, f–j), 100 μm (d, e, k).