Rissoa violacea Desmarest, 1814
Arctic to N. Morocco, lusitanian seamounts to Mediterranean. Grazer and detritus feeder in the infralittoral.
 
« Shell oval-pointed; whorls 6-7, with longitudinal ribs and transverse dotted streaks; a purple band on the middle of the last whorl, which continues in darker purple on the inner edge of each of the other whorls; mouth purple, bead of its right margin of a beautiful white. » – A. G. Desmarest: “Description des coquilles univalves du genre Rissoa de M. De Fréminville”,Bulletin des Sciences, par la Société Philomatique de Paris, Paris 1814, p.8 via BHL.

3m deep, in Posidonia meadow, Anse des Fossettes, at the root of the eastern peninsula, Saint-Jean-Cap-Ferrat, Alpes-Maritimes, SE. France. 4,4mm.
Synonym: tricolor Risso.
 
The purple can be missing, but the golden antelabial axial band is a constant feature in fully adult specimens. 3m deep, Brač island, Split-Dalmatia Comitat, S. Croatia. 5,1mm.

Original pictures provided by R. Stanić (HR).
– (CC BY-NC-SA) –
30m deep, Poetto, Cagliari, S. Sardinia. 4,2mm.
Cap Ras, Llançà, Girona, Catalunya, NE. Spain. 3mm.
On Posidonia oceanica, Costa Brava, E. Spain.
Original picture provided by J. Regàs – (CC BY-NC-SA).
8m deep, Liska Slatina beach, western coast of Lošinj island, Primorje-Gorski Kotar comitat, N. Croatia. 3,4mm.
Original pictures provided by A. Nappo (IT).
– (CC BY-NC-SA) –
Another specimen from Croatia, found on Posidonia. 5,3mm. Original picture provided by P. Ugarković (HR).
– (CC BY-NC-SA) –
A specimen from SE. Greece.
12m deep, Vouliagmeni area, Attikí. 3,7mm.

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