Dolomedes /dɒləˈmiːdiːz/ is a genus of large spiders of the family Pisauridae. They are also known as fishing spiders, raft spiders, dock spiders or wharf spiders. Almost all Dolomedes species are semi-aquatic, with the exception of the tree-dwelling D. albineus of the southwestern United States. Many species have a striking pale stripe down each side of the body.