Idaho springsnail (Pyrgulopsis idahoensis)
The Idaho springsnail (Pyrgulopsis idahoensis) is a small aquatic snail 0.2 to 0.25 inches long found in the middle Snake River, Idaho. Its shell is olive-tan in color with up to 6 whorls, and the body is pale with areas of grey/ black and reddish-brown. It occupies various substrates in lake and river habitats of the middle Snake River, where it feeds on diatoms. The Idaho springsnail was listed as endangered in 1992. Reasons for listing the snail were habitat modification, deteriorating water quality, restriction to free-flowing cool water habitats, significant range reduction, the appearance of the invasive New Zealand mudsnail, and the threat of several proposed hydroelectric dams. At the time of listing, the Idaho springsnail was known from only 35 river miles in the middle Snake River. We have learned through genetic studies that the species the Service listed in 1992 is now grouped with a new species, Pyrgulopsis robusta. that is comprised of four groups of freshwater springsnails living in Idaho, Oregon, Washington and Wyoming. This newly-combined species is distributed over a wider geographic area than in the original listing, and is no longer considered to be a separate species in need of protection under the Act. Because the Idaho springsnail is now considered to be a member of the species Pyrgulopsis robusta, it was delisted September 5, 2007.
- States/US Territories in which the Idaho springsnail is known to or is believed to occur: Idaho
- US Counties in which the Idaho springsnail is known to or is believed to occur: View All
|Status||Date Listed||Lead Region||Where Listed|
|12/14/1992||Pacific Region (Region 1)|
» Federal Register Documents
|05/25/2006||Idaho Springsnail 5-Year Review|
» Critical Habitat
No critical habitat rules have been published for the Idaho springsnail.
» Conservation Plans
No conservation plans have been created for Idaho springsnail.
» Life History
No Life History information has been entered into this system for this species.
» Other Resources
NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.
ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.
FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.