Rissoa ventricosa Desmarest, 1814
W. Mediterranean to Adriatic.
Synonym: subventricosa Cantraine, 1842.
Grazer and detritus feeder in the infralittoral.
 
« Shell bulbous, oval-acute, composed of five or six whorls, the last one moderately swollen, presenting onsets of superior longitudinal ribs, and very fine transverse striae; the other ones garnished with longitudinal ribs […] This shell is of a more or less yellowish white, with the peristome violet. » – 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.

12m deep, Vouliagmeni area, Attikí, SE. Greece. 7,8mm.
Same spot. 6,8-7,2mm.
High-spired specimens from Posidonia meadows, SaintTropez, Var, S. France. 7-7,2mm. The shell of the species differs from that of splendida by the size of the apex: minute in ventricosa, slightly larger in splendida. The ranges of the these two species overlap in Adriatic.

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