Species: Lymnaea stagnalis

H - >2,500,000 square km (greater than 1,000,000 square miles) - H - Nominal Lymnaea stagnalis extends over almost the whole of Europe and the western part of North Africa; all of Asia with the exception of the most southern regions, and probably also the extreme north-eastern region; extending from Asia Minor, Syria and Iran in the south, to Obdorsk in teh north and Kamchatka in teh east; and is widely distributed in North America, where it inhabits the region of the Great Lakes in a north-westerly direction to the Yukon River in Alaska and the western states to the north of the 37th parallel (largely absent from the east coast of North America and absent from Greenland and Iceland) (Hubendick, 1951). Burch (1989) cites distribution of <i>Lymnaea stagnalis appressa</i> as Great Lakes-St. Lawrence River drainage area, northwest to the Mackenzie and Yukon River drainage areas, west to the Rocky Mountains, some in the Rocky Mountains to Colorado, and in Illinois and Ohio in the Mississippi drainage. Burch (1989) cites distribution of<i> Lymnaea stagnalis sanctaemariae</i> as Lake Superior drainage area and adjacent parts of the Lake Huron, Wisconsin River and Winnipeg River drainage areas. Clarke (1981) lists <i>Lymnaea stagnalis jugularis </i>from Alberta and Saskatchewan.