Crommium grignonensis (d’Orbigny, 1850)

Caze, Bruno, Merle, Didier, Meur, Mathieu Le, Pacaud, Jean-Michel, Ledon, Daniel & Martin, Jean-Paul Saint, 2011, Taxonomic implications of the residual colour patterns of ampullinid gastropods and their contribution to the discrimination from naticids, Acta Palaeontologica Polonica 56 (2), pp. 329-347 : 339

Crommium grignonensis (d’Orbigny, 1850)

Fig. 6D .

Stratigraphic and geographic range.—Middle Eocene, Lutetian (PB) Colour pattern description.—This species exhibits three levels of residual colouration. The background is heterogeneous with a slightly fluorescent apical part ( Fig. 6D ). The transition between the two levels of the background is diffuse.

Figures

Fig. 6. Species of the genus Crommium Cossmann, 1888, under UV light. A. Crommium acutum (d’Orbigny, 1850), MNHN B58618 (MNHN coll.), Parnes, Oise, France, Lutetian, in ventral view. B. Crommium acutum (d’Orbigny, 1850), MNHN A30889 (MNHN coll.), Boursault, Marne, France, Lutetian, in ventral view. C. Crommium acutum (d’Orbigny, 1850), MNHN A30861 (MNHN coll.), Fleury−la−rivière, Marne, France, Lutetian, in ventral (C1) and dorsal (C2) views. D. Crommium grignonensis (d’Orbigny, 1850), type of Natica heberti Deshayes, 1864, MNHN J04185 (Hébert coll.), Chaumont−en−Vexin, Oise, France, Lutetian, in ventral view. Scale bars 10 mm. Photographs by C. Lemzaouda and P. Loubry (MNHN).