Monodacna semipellucida ( Logvinenko and Starobogatov, 1967 )

van de Velde, Sabrina, Yanina, Tamara A., Neubauer, Thomas A. & Wesselingh, Frank P., 2020, The Late Pleistocene mollusk fauna of Selitrennoye (Astrakhan province, Russia): A natural baseline for endemic Caspian Sea faunas, Journal of Great Lakes Research 46 (5), pp. 1227-1239 : 1235-1236

Monodacna semipellucida ( Logvinenko and Starobogatov, 1967)

( Fig. 4 : 3).

*1967 Hypanis semipellucida Logvinenko and Starobogatov : 232 –233.

1973 Hypanis semipellucida Logvinenko and Starobogatov, 1967 – Grossu: 144, fig. 27.

2013 Adacna (Monodacna) semipellucida Logvinenko and Starobogatov, 1967 – Kijashko in Bogutskaya et al.: 384, fig. 161, photo 55.

Dimensions – max. L 23 mm, H 16 mm.

Characterization – This species is relatively thin-walled and low, often has an elliptical outline in adult stages with low, broad and smooth ribs and narrow interspaces. The ribs and interspaces are well visible on the shell’s interior. The most distinct character is the cardinal tooth that is a very narrow but well delimited knob that is located well towards the base of the hinge platform.

Ecology – Monodacna semipellucida lives in the Middle Caspian Sea ( Bogutskaya et al., 2013; Logvinenko and Starobogatov, 1969; Wesselingh et al., 2019), down to 40 m water depth and minimum salinities of 5–8 psu ( Bogutskaya et al., 2013; Logvinenko and Starobogatov, 1969).

Figures

Fig. 4. Cardiidae. (1) Adacna laeviuscula; (a) RGM.1309812 LV; (b) RGM.1309813 RV. (2) Adacna minima; (A) RGM.1309811 LV; (b) RGM.1309810 RV. (3) Monodacna semipellucida, RGM.1309802 RV; (4) Monodacna caspia s.l. (a) RGM.1309803 LV; (b) RGM.1309804 RV. (5) Hypanis plicata; (a) RGM.1309808 LV (b) RGM.1309809 RV. Scale bars = 1 cm.