Species: Megomphix hemphilli

D - 1000-5000 square km (about 400-2000 square miles) - D - For Washington, records indicate this species has a low-elevation distribution from Olympia to the Columbia River that does not include any National Forest. For Oregon, it is known from the Coos Bay, Eugene, Roseburg, and Salem Districts and is suspected to occur in the Medford District of the Bureau of Land Management. It is known from the Siuslaw, Umpqua and Willamette National Forests and is suspected to occur in the Mount Hood, Rogue River, and Siskiyou National Forests, and the Columbia River Gorge National Scenic Area. Specimens collected by Branson (1977; 1980) on the Olympic Peninsula have been determined to be immature haplotrematid snails (Applegarth, 2000).