{{Short description|Genus of gastropods}} {{Italic title}} {{Automatic_taxobox | image = Amphigyra alabamensis shell.jpg | image_caption = shells of ''Amphigyra alabamensis'' | taxon = Amphigyra | authority = Pilsbry, 1906<ref name="Pilsbry">Pilsbry H. A. (1906). "Two new American genera of Basommatophora". ''The Nautilus'' '''20'''(5): [https://archive.org/stream/nautilus20amer#page/n67/mode/2up 49]–50.</ref> }}
'''''Amphigyra''''' is a genus of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.
== Species == The genus ''Amphigyra'' contains the following species: * shoal sprite (''Amphigyra alabamensis'') - type species <!--Bot notice: new species go here-->
== Original description == Genus ''Amphigyra'' was originally described by Henry Augustus Pilsbry in 1906.<ref name="Pilsbry"/>
Pilsbry's original text (the original description) reads as follows:
{{Cquote| Genus AMPHIGYRA nov.
The shell is minute, Neritoid or Crepidula-like, with a small depressed lateral spire, apparently dextral, composed of about 1<math>\begin{matrix} \frac{1}{2} \end{matrix}</math> very rapidly enlarging whorls, the last very convex dorsally, imperforate; the apex is smooth, and the last whorl is spirally striate. The aperture is very large, oblique, transversely oval, the peristome continuous and free, thin. Carity of the spire very small, a thin, broad, concave columellar plate projecting across the end next the spire, as in ''Crepidula'' or ''Latia''.
The soft parts are sinistral, externally Limnaeoid, with large black eyes near the inner bases of the short blunt cylindric tentacles.
Two adductor muscles, kidney-shaped in section, one on each side, replace the usual columellar muscle.
[[File:Amphigyra alabamensis radula.jpg|right|thumb|radula of ''Amphigyra alabamensis'']] The radula has 18, 1, 18 teeth, arranged about as in ''Lymnaea''. Centrals with a single cusp, the laterals bicuspid, the outer cusp smaller. The transition teeth have four or five cusps. The marginal teeth are low, wide and separated, with four or five cusps. PI. III, fig. 6, teeth of ''A. alabamensis''.
There is a short false gill hanging in the pallial cavity.
The shell has some resemblance to ''Crepidula'' and ''Latia''. ''Lepyrium'' and ''Pompholyx'' are also slightly similar; but the resemblance is no doubt superficial. ''Pompholyx'', like ''Amphigyra'', is sinistral with an ultrasinistral shell. It has no plate or lamina across the visceral cavity. The soft anatomy of ''Amphigyra'', so far as worked out, seems to show most affinity with the Ancylidae.
The deck of ''Amphigyra'' is present at all stages of growth observed, in young as well as mature shells. In ''Gundlachia'' no septum is developed until a period of hybernation<!-- ORIGINAL SPELLING--> or aestivation is reached. The shell is more solid than that of ''Ancylus'' or ''Gundlachia''. }}
== References == {{Reflist}}
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Category:Planorbidae Category:Taxonomy articles created by Polbot Category:Taxa named by Henry Augustus Pilsbry