AbstractSpecimens of the lumbriculid genusStyloscolexMICHAELSEN have been found in northern Alaska. They were identified asSt. opisthothecusSOKOLSKAJA 1969, known from Kamchatka. A description of the Alaskan specimens and habitats is given. The genusStyloscolexonce supposed to be a Baikalian endemic has representatives also in Manchukuo and Japan. It is pointed to the fact that bottom‐living organisms of lakes of vast areas are rather unknown. Only Lake Baikal, famous for its size and depth, has attracted special interest and been thoroughly investigated. The genusStyloscolexmay thus be found in more areas. In any case, the present finds show that it is not restricted to eastern Asi