Species: Gyraulus parvus

H - >2,500,000 square km (greater than 1,000,000 square miles) - H - This species is well distributed in North America from Alaska and the north of Canada to the south of the continent and from the Atlantic to the Pacific Coast (Burch, 1989). It was first found in Cuba in a botanical garden in Cienfuegos province but has also been found in diverse water bodies of the central region (Pointier et al., 2005). It also occurs in Mexico as far south at least to Morelos (Thompson, 2008). It has been introduced to Europe - France, Austria, Germany and the Czech Republic (Beran and Horsak, 2002) - and Israel, where it is found in human-dominated habitats (Roll et al., 2009). It was first recorded in the French Upper Rhone in 1994, and has since been recorded as highly abundant (Besacier-Monbertrand et al., 2009).<br>