Procytheropteron sp. 1 Franz et al., 2018

Fig. 11: 6

Material.

2 LV in sample He19-24 and from the Geisingen clay pit.

Distribution.

Upper Aalenian, Bradfordensis Zone; SW Germany.

Description.

Very small, ovoidal. Anterior margin almost symmetrically rounded; posterior margin pointed, apex at mid-height. Cardinal angles rounded in the left valve.

Dorsal margin straight to slightly convex, ventral margin convex, medianly partly obscured by a median overhang of the lateral curvature. The complete lateral surface is decorated with vertical, broadly rounded ribs. The ribs in the median part of the valve are irregular, interrupted at about mid-height, and offset laterally against each other. The vertical ribs are framed by a curved ventral rib, which is also rounded, and a similar dorsal rib, which almost touch each-other mid-posteriorly.

Internal details not observed.