Alvania canariensis is a species of minute sea snail, a marine gastropod or micromollusk in the family Rissoidae.
Description The length of the shell varies between 1 mm and 3 mm.
The imperforate, white shell is solid. It is covered with rounded nodules by the intersection of longitudinal and spiral ribs. The shell contains five whorls, slightly convex, with a rather deep suture. The outer lip is thickened and margined.G.W. Tryon (884), Manual of conchology, structural and systematic : with illustrations of the species; Academy of Natural Sciences ser. 1, vol. 9
About 3 1/2 of the whorls are in the teleoconch, while the other 1 1/2 are in the protoconch.
The protoconch is white, with a black or brown spot at the apex. The teleoconch is usually brown.
Distribution The species has been found off the Canary Islands.
References
External links
Orbigny, A. D. d'. (1836-1842). Mollusques, Echinodermes, Foraminifères et Polypiers recueillis aux Iles Canaries par MM. Webb et Berthelot. In: Barker-Webb, P. & Berthelot, S. (eds) Histoire naturelle des Iles Canaries, volume 2(2): 117 pp., pls 1-7, 7B. pp Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca. in: Costello, M.J. et al. (eds), European Register of Marine Species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Patrimoines Naturels. 50: 180-213