Didacna longipes (Grimm, 1877)

*1877 Cardium longipes Grimm: 54-56, pl. 8, fig. 4 a–c .

1952 Didacna longipes (Grimm, 1877). - Zhadin: 349-350, fig. 326.

1969 Didacna longipes (Grimm). - Logvinenko and Starobogatov: 326, fig. 345.

1973 Didacna longipes Grimm, 1877. - Grossu: 132, text fig. 9, pl. 1, fig. 2.

?2007 Didacna carinata Nevesskaja: 943, pl. 24, figs 15-19.

2013 Didacna longipes (Grimm, 1877). - Kijashko in Bogutskaya et al.: 354, fig. 137, photo 43.

2016 Didacna longipes (Grimm, 1877). - Vinarski and Kantor: 71.

Status. Pontocaspian species, endemic to Caspian Sea.

Type locality. Caspian Sea, offshore Azerbaijan, approximately 40°39'N, 50°26'E.

Distribution. Southern and middle Caspian Sea basins and southern part of the northern Caspian Sea down to 30-40 m water depth. The species often co-occurs with D. barbotdemarnii .

Remarks. We are uncertain about the status of Didacna carinata Nevesskaja, 2007. The overall outline resembles that of D. barbotdemarnii, but the former species appears smaller and thinner. Kijashko in Bogutskaya et al. (2013) considered D. carinata as a synonym of D. longipes .

Conservation status. Not assessed.