Alvania gradatoides
Introduction '''''Alvania gradatoides''''' is a species of minute sea snail with an operculum, a marine gastropod mollusk in the family Rissoidae.
Distribution * New Zealand (off Oamaru)* Tasmania
Description The length of the shell attains 3 mm, its diameter 1.6 mm. ''Alvania gradatoides'' was originally discovered and described as ''Linemera gradatoides'' by Harold John Finlay in 1930.
References * Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland * Ponder, W.F. 1985 A review of the genera of the Rissoidae (Mollusca: Mesogastropoda: Rissoacea), Records of the Australian Museum (* Spencer, H.G., Marshall, B.A. & Willan, R.C. (2009). Checklist of New Zealand living Mollusca. Pp 196-219.in: Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch. * Liu, J.Y. Ruiyu (ed.). (2008). Checklist of marine biota of China seas. China Science Press. 1267 pp.
External links * http://www.mollusca.co.nz/speciesdetail.php?speciesid=620&species=Alvinia%20(Linemera)%20gradatoides