Alvania gradatoides explained

Alvania gradatoides is a species of minute sea snail with an operculum, a marine gastropod mollusk in the family Rissoidae.^[1]

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.^[2]

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

Notes and References

1. Bouchet, P. (2011). Alvania gradatoides (Finlay, 1930). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=565212 on 2012-07-25
2. [Harold John Finlay|Finlay H. J.]