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Gammarus

Food
Gammarus is an amphipod crustacean genus in the family Gammaridae. It contains more than 200 described species, making it one of the most species-rich genera of crustaceans. Wikipedia
Scientific name: Gammarus
Phylum: Arthropoda
Domain: Eukaryota
Family: Gammaridae
Genus: Gammarus; Fabricius, 1775