Basis for Former Listing
The Midwest Pleistocene vertigo is a rare landsnail with a limited range in southeastern Minnesota, northeastern Iowa, and southwestern Wisconsin. The majority of known populations in Minnesota are in Fillmore County. This taxon was more widespread during the Wisconsin glacial period (>12,000 years ago), but it now survives only as small relict populations with very specific habitat requirements. The rarity of this species led to its classification as endangered in Minnesota in 1996.
Basis for Delisting
Since its listing in 1996, the known range of the Midwest Pleistocene vertigo has expanded into eastern Wisconsin, Ontario, and also now includes Alaska near Fairbanks and northern Yukon. Field surveys and review of museum collections also have demonstrated the Midwest Pleistocene vertigo's occurrence in a broader range of habitats. Moreover, taxonomic work based on shell morphology and genetic data has determined that V. hubrichti hubrichti cannot be considered a distinct species, but simply a different morphologic shell form of the species V. arthuri, a more widespread species in Minnesota. Therefore, a status of endangered is no longer necessary. The Midwest Pleistocene vertigo was delisted in 2013.