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Gammaridea was one of the of the order Amphipoda, comprising small, shrimp-like . In a traditional classification, it encompassed about 7,275 (92%) of the 7,900 species of amphipods described by then, in approximately 1,000 genus, divided among around 125 families. (2025). 9781402082771, Springer. ISBN 9781402082771 That concept of Gammaridea included almost all fresh water amphipods, while most of the members still were marine.
The group is however considered paraphyly, and was deconstructed in a series of papers by the amphipod taxonomists James K. Lowry and Alan A. Myers. In 2003 they moved several families from Gammaridea to join members of the former Caprellidea in a new suborder Corophiidea.A. A. Myers & J. K. Lowry (2003). "A phylogeny and a new classification of the Corophiidea Leach, 1814 (Amphipoda)". Journal of Crustacean Biology 23 (2): 443–485. doi:10.1651/0278-0372 Further, in 2013 another large suborder Senticaudata was established, which would encompass much of the original Gammaridea, particularly its freshwater families, and into which also the Corophiidea was merged.Lowry, J.K. & Myers, A.A. (2013) A Phylogeny and Classification of the Senticaudata subord. nov. (Crustacea: Amphipoda). Zootaxa 3610 (1): 1-80. Senticaudata WoRMS The remaining 85 Gammaridea families, of superfamilies Liljeborgioidea, Lysianassoidea and Eusiridae were rearranged to the new suborder Amphilochoidea in the final subordinal revision (2017), which no longer recognizes Gammaridea as a taxon.
The subgroups that were included in this suborder were:
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