Neoplanorbis tantillus
Neoplanorbis tantillus was a species of very small air-breathing freshwater snail, an aquatic gastropod mollusk in the family Planorbidae, the ram's horn snails. This species was endemic to the United States. In 2012, it was declared extinct by the IUCN Red List of Threatened Species.
The shell of this species appeared to be dextral in coiling, but as is the case in all planorbids, the shell was actually sinistral. The shell was carried upside down with the aperture on the right, and this made it appear to be dextral.
Original description
Species Neoplanorbis tantillus was originally described by Henry Augustus Pilsbry in 1906.Type locality is Coosa River near or in Wetumpka, Alabama.
Pilsbry's original text reads as follows:
Note: "preceding species" in the description means Amphigyra alabamensis, because these two species were newly described in the same work.