Eucytherura sp. 1 Franz et al., 2018

Fig . 7: 3

Material.

5 RV, 1 LV in samples He19-2-12; 17 C, 1 RV from the Geisingen clay pit; 1 C from the Benken borehole (Switzerland).

Occurrence.

Lower Aalenian, Opalinum Zone; SW Germany, N Switzerland.

Description.

Very small, subrectangular. Left valve slightly larger than right with dorsal overlap. Anterior margin rounded with extremity slightly below mid-height; posterior margin pointed in right and bluntly rounded in left valve, apex above mid-height. Posterior cardinal angle rounded; anterior cardinal angle pronounced in both valves, slightly more rounded in right valve. Dorsal and ventral margins slightly convex in both valves. Greatest height at anterior cardinal angle; greatest length above mid-height. Shell ornamentation reduced to a regular reticulation with rounded meshes of uniform size. Hemispherical eye-tubercle well developed. Internal details not observed.