Alvania subcalathus is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae. Description The length of the shell varies between 2.5 mm and 4.3 mm. Distribution This species occurs in the Atlantic Ocean off the Canary Islands. References Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213 (l External links Rissoidae Gastropods described in 1906