Didacna ebersini Fedorov, 1953

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 : 1232-1233

Didacna ebersini Fedorov, 1953

( Fig. 5 : 5).

*1953 Didacna ebersini Fedorov : 125, pl. 14, fig. 2, fig. 5, and fig. 6 (? non figs. 1, 3, 4).

1999 Didacna ebersini Fedorov – Fedorov: pl. 12, fig. 1. 1983 Didacna ebersini Fedorov – Popov: 203, pl. 16, figs. 1–16. 2007 Didacna ebersini Fedorov, 1953 – Nevesskaja: 931, pl. 20, figs. 6–16.

Dimensions – max. L 19.0 mm, H 14.9 mm.

Characterization – Intermediate-sized, flat and thin shelled broad trigonate Didacna with flat ribs; posterodorsal margin is low and in adult stages not well delimited. The posterior ridge is low and subangular and fading during growth. The species have 16–22 posterior ribs. Rib width is somewhat irregular but ribs are about as wide as interspaces. In cross-section they are markedly low. Juvenile outline is trigonate with a distinct often double keel forming the posterior ridge. The base of the juveniles is flat to somewhat concave just before the posterior ridge.

Ecology – Unknown (extinct).

Figures

Fig. 5. Overview of the Cardiidae.(1) Didacna subcrassa; (a) RGM-1309816 LV;(b) RGM-1309815 RV.(2) Didacna subpyramidata; (a) RGM-1309797 LV; (b) RGM-1309814 RV. (3) Didacna subcatillus; (a) RMG-1309819 LV; (b) RMG-1309820 RV. (4) Didacna emendata; (a) RGM-1309799 LV; (b) RGM-1309798 RV. (5) Didacna ebersini; A (a) RGM- 1309817 LV; (b) RGM-1309818 RV. (6) Didacna cristata; (a) RGM.1309800 LV; (b) RGM.1309801 RV. Scale bars = 1 cm.