钩虾亚目（学名Gammaridea）是一类细小及像虾的端足类。其中包含了约1000属及5700个物种，差不多所有淡水端足类及大部份海洋分支。

Ampeliscoidea

Crangonyctoidea

Dexaminoidea

Eusiroidea

Gammaroidea

Hadzioidea

Iphimedioidea

Kurioidea

Leucothoidea

Liljborgioidea

Lysianassoidea

Melphidippoidea

Oedicerotoidea

Pardaliscoidea

Phoxocephaloidea

Gammaridea is one of the suborders of the order Amphipoda, comprising small, shrimp-like crustaceans. Until recently, in a traditional classification, it encompassed about 7,275 (92%) of the 7,900 species of amphipods described by then, in approximately 1,000 genera, divided among around 125 families. That concept of Gammaridea included almost all freshwater amphipods, while most of the members still were marine.