Neoplanorbis tantillus

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Neoplanorbis tantillus
Neoplanorbis tantillus shell.jpg
Three views of a shell of Neoplanorbis tantillus oriented as if it were a dextral shell. (All planorbids are in fact sinistral.)
Scientific classification
N. tantillus
Binomial name
Neoplanorbis tantillus

Neoplanorbis tantillus is a species of very small air-breathing freshwater snail, an aquatic gastropod mollusk in the family Planorbidae, the ram's horn snails. This species is endemic to the United States. In 2012, it has been declared extinct by the IUCN Red List of Threatened Species.[1]

The shells of this species appear to be dextral in coiling, but as is the case in all planorbids, the shell is actually sinistral. The shell is carried upside down with the aperture on the right, and this makes it appear to be dextral.

Original description[edit]

Species Neoplanorbis tantillus 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:

Note: "preceding species" in the description means Amphigyra alabamensis, because these two species were newly described in the same work.


  1. ^ a b Cordeiro, J. & Perez, K. (2012). "Neoplanorbis tantillus". IUCN Red List of Threatened Species. IUCN. 2012: e. Retrieved 10 November 2017.{{cite iucn}}: error: malformed |page= identifier (help)
  2. ^ a b Pilsbry H. A. (September 1906). "Two new American genera of Basommatophora". The Nautilus 20(5): 49–51.