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Gammaridae
gammarids, scuds
Gammaridae is a family of amphipod crustaceans with a distribution centered on Eurasia. The family exhibits euryhaline tolerance as a lineage, inhabiting environments from freshwater to marine waters. Historically, Gammaridae served as a wastebin taxon for numerous gammaridean amphipods, many of which have since been reassigned to separate families including Anisogammaridae, Melitidae, and Niphargidae. In North America, members are commonly referred to as scuds.