Alvania macandrewi is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Description The length of the shell varies between 2.4 mm and 3 mm.
In some of its forms A. macandrewi greatly resembles some forms of Alvania canariensis. But the spire rises more in steps, the last three whorls are less attenuated, the ribs are wider-set, are broader, and fewer. The spiral scratchings are much more distinct. The heavy white labial rib and the absence of the brown stain either on this rib or on the tip of the apex are very distinctive.Watson, R. B. (1873). On some marine mollusca from Madeira, including a new genus of the Muricinae, a new Eulima and the whole of the Rissoa of the group of islands. Proceedings of the Zoological Society of London. 1873: 361-391
The shell is imperforate, solid and has a yellowish chestnut color. It contains six whorls, turreted or round-shouldered, with close, large, longitudinal ribs, rendered nodulous by spiral impressed lines. The lip is duplicate, the outer lip expanded, with fimbriated edge.G.W. Tryon (1884), Manual of conchology, structural and systematic : with illustrations of the species; Academy of Natural Sciences ser. 1, vol. 9
Distribution This species occurs in the Atlantic Ocean off Madeira and the Canary Islands.
References
External links Manzoni A. (1868). Nouvelles espèces de Rissoa recueillies aux îles Canaries et à Madère par M. Mac-Andrew, en 1852. Journal de Conchyliologie. 16: 164-168 Segers, Willy, Frank Swinnen, and António Domingos Abreu. "An annotated checklist of the marine molluscs from the archipelagos of Madeira and the Selvagens (NE Atlantic Ocean)." (2009). 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