Shoal sprite
| Shoal sprite | |
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| Shells of Amphigyra alabamensis | |
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| Species: | † A. alabamensis
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| Binomial name | |
| † Amphigyra alabamensis | |
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| Location of the Coosa River, in green | |
The shoal sprite (Amphigyra alabamensis) was a species of minute, air-breathing, freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. This species was endemic to Alabama, but it is now extinct.
Original description
Species Amphigyra alabamensis was originally described by Henry Augustus Pilsbry in 1906.[2]
Type locality is Coosa River near or in Wetumpka, Alabama.
Pilsbry's original text (the type description) reads as follows:
Amphigyra alabamensis n. sp. PI. III, figs. 1, 2.
The shell is shaped like a convex Crepidula, closely, finely and sharply striate spirally, and of a pale yellowish-corneous tint. The last whorl flares in a raised ledge at the baso-columellar region, the back being very convex. The spire is slightly sunken, depressed. The raised parietal margin of the lip is abruptly kinked where it passes across the preceding whorl. The columellar plate or deck extends over nearly one-third the total transverse length of the aperture. Alt. 1.1, diam. 2 mm.
Wetumpka, Alabama, on the under surfaces of rocks in swift water.
References
- ^ Bogan, A.E. (2000). "Amphigyra alabamensis". The IUCN Red List of Threatened Species. 2000. IUCN: e.T1168A3301341. doi:10.2305/IUCN.UK.2000.RLTS.T1168A3301341.en. Retrieved 11 January 2018.
- ^ a b Pilsbry H. A. September 1906. Two new American genera of Basommatophora. The Nautilus, volume 20, number 5, pages 49–50.