Alvania gradatoides

Alvania gradatoides
	Shell of Alvania gradatoides (specimen at the Auckland Museum)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Superfamily:	Rissooidea
Family:	Rissoidae
Genus:	Alvania
Species:	A. gradatoides
Binomial name
	Alvania gradatoides; (Finlay, 1930)
Synonyms
	Alvania (Linemera) gradatoides (H. J. Finlay, 1930) alternate representation; Alvinia (Linemera) gradatoides (Finlay, 1930); Linemera gradatoides Finlay, 1930;

Alvania gradatoides is a species of minute sea snail with an operculum, a marine gastropod mollusk in the family Rissoidae.^[2]

Distribution

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.^[1]

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.