Editing Amphipoda (section)

{{short description|Order of malacostracan crustaceans}}
{{redirect|Sea flea|the Jacques Cousteau diving saucers|SP-350 Denise#SP-500 Sea Fleas}}
{{Automatic taxobox
| fossil_range = {{fossil range|Hauterivian|Recent}}
| image = Gammarus roeselii.jpg
| image_caption = ''[[Gammarus roeselii]]''
| display_parents = 2
| taxon = Amphipoda
| authority = [[Pierre André Latreille|Latreille]], 1816
| subdivision_ranks = Suborders
| subdivision =
Revised division (2017)<ref name=WoRMS>{{cite WoRMS |year=2025 |title=Amphipoda |id=1135 |access-date=2025-04-21 |db=amphipoda}}</ref>
*[[Amphilochidea]]
*[[Colomastigidea]]
*[[Hyperiidea]]
*[[Hyperiopsidea]]
*[[Pseudingolfiellidea]]
*[[Senticaudata]]
Former division<ref name="M&D"/>
*[[Gammaridea]]
*[[Caprellidea]]
*[[Hyperiidea]]
*[[Ingolfiellidea]] (currently separate order)
}}

'''Amphipoda''' ({{IPAc-en|æ|m|ˈ|f|ɪ|p|ə|d|ə}}) is an [[order (biology)|order]] of [[malacostraca]]n [[crustacean]]s with no [[carapace]] and generally with laterally compressed bodies. Amphipods ({{IPAc-en|ˈ|æ|m|f|ɪ|p|ɒ|d|z}}) range in size from {{convert|1|to|340|mm|sigfig=2}} and are mostly [[detritivore]]s or [[scavenger]]s. There are more than 10,700 amphipod species currently recognized. They are mostly marine animals, but are found in almost all aquatic environments. Some 2,250 species live in fresh water, and the order also includes the terrestrial [[Talitridae|sandhoppers]] such as ''[[Talitrus saltator]]'' and ''[[Arcitalitrus sylvaticus]]''.