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.
Juvenile.
Playa de las Higuericas, El Mojón, Pilar de la Horadada, Alicante Province, SE. Spain. Original picture provided by M. Zonneveld for iNaturalist – (CC BY). Size: 0,9mm.

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