Crommium Cossmann, 1888

Islamoğğlu, Yeşşim, Dominio, Stefano & Kowalke, Thorsten, 2011, Early Eocene Caenogastropods (Mollusca, Gastropoda) from Haymana-Polatl Basin, Central Anatolia (Turkey): taxonomy and palaeoecology, Geodiversitas 33 (2), pp. 303-330 : 310

Genus Crommium Cossmann, 1888

TYPE SPECIES. — Natica willemeti Deshayes, 1824 . Middle Eocene: Paris Basin.

Crommium has moderately large to medium size, thick, globular shell. The most characteristic prominent features are the short, sharp, and concave spire, arched or somewhat flattened, stepped teleococh whorls separated by deep suture lines. The shell surface is smooth or ornamented very fine spiral lines and its last whorl very large, usually more or less flattened above, umbilicus slightly open or covered in part by the overthrow of the columellar edge and aperture narrow, ovate-elongated ovate

Crommium was described from Late Cretaceous- Miocene deposits from Europe, Iran, North and South America ( Wenz 1938).

In previous studies Crommium was included in subfamily Globulariinae Wenz, 1941 of the family Naticidae Guilding, 1834 considering the general shape of the teleoconch ( Cossmann 1888; Wenz 1938). Recently, the genus has been assigned to Ampullospiridae Cox, 1930 (= Ampullospirinae Marincovich, 1977 ), based on morphological similarities of the teloconch and protoconch features to the “living ampullospirid species” Cernina fluctuata ( Kase & Ishikawa 2003). Following the latter we include this genus in Ampullinidae .