Williamia gussonii (O.G. Costa, 1829)
Azores to Mediterranean, to Canarias.
Grazer in the infralittoral and the circalittoral.
Original taxon: Ancylus gussonii.
Synonyms: curvissior, gibbosus, vitrea…
4m deep, at the foot of the citadel, south of the harbour, Methóni, Messinia, Peloponnese, SW. Greece. 3,7mm.
3-6m deep, offshore gardens made of small Posidonia patches in rough sand pockets on granitic substract, southwestern end of Ghjunchitu Bay, Isola Rossa, NW. Corsica. 3,7mm.
Protoconch dextral-hyperstrophic, typical of Siphonariids.
Shallow grit, El Forat (al Fourat), Paulilles, Port-Vendres, Eastern Pyrenees, S. France. 3,9mm.
55m deep, Ognina, Catania, E. Sicilia. 3,8mm.

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