Potamopyrgus antipodarum is an invasive freshwater snail.
Right side view of the live snail in the laboratory. The width of the shell of this specimen is 3 mm and the height of the shell is 5 mm:
There are visible the following features on the photo: light brown shell, the white foot, dark snout, long tentacles and the small white dot near the eye. Detailed information about Potamopyrgus antipodarum are available at the Conchological Society of Great Britain and Ireland website.
Smith I. (last revision 13 May 2013, accessed 25 October 2014) Potamopyrgus antipodarum (J E Gray, 1843). Conchological Society of Great Britain and Ireland. (This freshwater and brackish water snail is incorrectly placed among marine snails there.)