Gibbula fanulum (Gmelin, 1791)
Algarve to Mediterranean. Grazer and deposit feeeder in the infralittoral and circalittoral. Original taxon: Trochus fanulum.
5m deep, under stones near Posidonia , Port-Pin, Cassis, Provence, S. France. 17mm.
Synonyms tuberculatus and undulatus Risso.
Specimens without erosion are extremely uncommon.
6m deep, on gravel, Elafonisi, Kissamos, W. Crete. 16mm.
Named variants: albosordida, rubra, varia…
On shallow water bottoms with stones, rough sand and gravel among rocks, Pointe de Rochelongue, Cap d’Agde, S. France. 6-11mm.
The species in H. A. Pilsbry: Manual of conchology, structural and systematic vol. XI, Philadelphia 1889, plate 63.
 
« Shell umbilicate or perforate, conical, solid, whitish, radiately maculated above, dotted beneath with red or rich brown ; spire conical, acuminate, somewhat scalariform ; whorls about 7, very convex, spirally lirate, radiately costate above, bicarinated at the periphery, and encircled by a deep canal ; base convex, bearing about 5 spiral lirae ; aperture oblique, rounded, columella sinuous in the middle […], arcuate above ; umbilicus broad and funnel-shaped, or narrow and almost closed. […] Easily recognized by the turrited, acuminate spire and the deep peripheral groove, […] and lacks the central riblet. Several varieties (lutea, nigra, rubra, albo-sordida and varia, all of Scacchi) have been founded upon color mutations – the shell being subject to the same variations in hue as G. magus. »op. cit. p.199.
90m deeep, off Barcelona, Catalunya, NE. Spain. 7,2-7,3mm.
The species in Dautzenberg (left) and in Risso (right).
39m deep, Skorpidi islet, southeastern coast of Lefkáda island, Ionian archipelago, SW. Greece. 9mm.

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