Fig. 2

Acesta clypeiformis (d’Orbigny, 1847) with adductor muscle scars retaining phosphatized muscle remains. Cenomanian, Falaises des Vaches Noires, France. B taken under UV-light, A, B adductor muscle of the right valve (marked with a rectangle in D). C–F Photos of the entire specimen. C Anterior; D right; E posterior; F left view. G Adductor muscle of the left valve (marked with a rectangle in F)