Fig. 9C
ITALY – Emilia-Romagna • 1 spec.; Casola; MGGC 22312 (L = 7 mm).
Small, little inflated, sub-triangular shell, surface with distinct, irregular growth increments, umbones elevated, pointed, slightly prosogyrate; posterior sulcus present, widening posteriorly, bordered by indistinct ridge; anterodorsal margin very long, slightly concave.
Lower Miocene (lower Burdigalian), northern Italy.