Freshwater gastropods of the families Amnicolidae, Bithyniidae, Baicaliidae, and Benedictiidae are shown for the first time to harbor spirochetes associated with the crystalline style in the intestinal tract. The examined gastropod species are omnivorous, phyto-detritophagous grazers or filter-feeders. Their habitats are various water bodies and biotopes, including deep water hydrothermal vents and gas hydrate zones in Lake Baikal. ID печат. издания 150