湖泊钩虾，节肢动物门-甲壳纲-端足目-钩虾科。维基百科Gammarus is an amphipod crustacean genus in the family Gammaridae. It contains more than 200 described species, making it one of the most speciose genera of crustaceans.[2] Different species have different optimal conditions, particularly in terms of salinity, and different tolerances; Gammarus pulex, for instance, is a purely freshwater species, while Gammarus locusta is estuarine, only living where the salinity is greater than 25‰.[3]Species of Gammarus are the typical "scuds" of North America and range widely throughout the Holarctic. A considerable number are also found southwards into the Northern Hemisphere tropics, particularly in Southeast Asia.[4]External identifiers for GammarusEncyclopedia of Life39782ITIS93773NCBI45625WoRMS101537Also found in: WikispeciesThe following species are included:[5] Gammaridae