Definition of "amphipod"

Most of these are quite large, made by the small marsh mammals, but some are small and seem to be much used by the amphipods.

1905, Mabel Elizabeth Smallwood, The Salt-marsh Amphipod: Orchestia Palustris, Brooklyn Institute of Arts and Sciences, page 18

Laboratory feeding assays employing the common antarctic planktivorous fish Pagothenia borchgrevinki demonstrated that live amphipods are consumed by fish, while amphipod-sea butterfly pairs are consistently rejected.

2001, James B. McClintock, Bill J. Baker, Deborah K. Steinberg, “5: The Chemical Ecology of Invertebrate Meroplankton and Holoplankton”, in James B. McClintock, Bill J. Baker, editors, Marine Chemical Ecology, CRC Press, page 217

We have managed just once, briefly, to send humans to that depth in a sturdy diving vessel, yet it is home to colonies of amphipods, a type of crustacean similar to shrimp but transparent, which survive without any protection at all.

2003, Bill Bryson, A Short History of Nearly Everything, BCA, page 212