Alzoniella perrisii is a species of very small aquatic snail, a spring snail, an operculate gastropod mollusc in the family Hydrobiidae.
Subspecies Alzoniella perrisii irubensis Boeters, 2000 Alzoniella perrisii perrisii (Dupuy, 1851)
Description (Original description in Latin) The very small shell is imperforate, with a blunt protoconch and a slightly elongated cylindrical shape, remarkably smooth. The aperture is somewhat ovate-pyriform, with a slightly obtuse angle at the top, and features a continuous, straight, simple, and sharp peristome. The shell contains 4 whorls, gradually increasing in size, slightly convex, and separated by a faintly visible suture. The body whorl accounts for at least half of the shell's total length.
The shell is thin, horn-colored, translucent, and glossy, though often obscured by a dark coating of mud.
The operculum is very thin, translucent, and horn-yellow, and is slightly recessed into the body whorl.
Distribution This species occurs in France.
References