Alvania aspera (Philippi, 1844)
Central and Eastern Mediterranean, including Adriatic and Aegean. Grazer in the infralittoral, often in seagrass beds.
 
The shell is stocky, solid, thick, with a paucispiral protoconch. Teleoconch of circa 4 whorls quickly increasing in diameter, very convex, separated from each other by a shallow suture. Sculpture: 7 strong axial ribs, wider than their interspaces, crossed by marked spiral beads (5 above the aperture, the three of the periphery being the strongest); microsculpture made up of rough growth marks that come across the spirals. Pattern: series of red-brownish dots lined up on the beads; background colour whitish; occasional presence of some larger and darker blotches on the spirals.

Above and below: 8m deep, Bozcaada island, Çanakkale province, W. Marmara, NW. Turkey. 3,75mm.
Detail of the microsculpture.
3m deep, Lošinj island, Primorje-Gorski Kotar Comitat, N. Croatia. 3,4mm.
Original pictures provided by A. Nappo (IT).
(CC BY-NC-SA)
Contrasted pattern. 46m deep, southern coast of Mljet island, Dubrovnik-Neretva Comitat, S. Croatia. Size about 4mm.
Original pictures provided by N. Lete (HR).
(CC BY-NC-SA)
2-6m deep, on Posidonia leaves, Uvala Žorljevica, southern coast of Molat island, Zadar Comitat, Croatia. 3,7mm.

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