Species of gastropod
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Alzoniella perrisii is a species of very small aquatic snail, a spring snail, an operculate gastropod mollusc in the family Hydrobiidae.
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.
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