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Crangonyx pseudogracilis
Image courtesy of Naturalis Biodiversity Center via and the CC BY-NC-SA 3.0 license
Crangonyx pseudogracilis
Taxonomic Group: Crustaceans-Amphipods


Crangonyx pseudogracilis is a free-living freshwater amphipod. It was described from Ontario, Canada and is native to Eastern North America. It has been introduced to tidal portions of the Columbia River (Washington/Oregon) and freshwater areas of California and Europe (Ireland to Portugal). It has been intentionally introduced to some areas as a food resource for pond and lake fishes. Other possible vectors include recreational boats, ornamental aquatic plants, and canals (in Europe). There are no reported ecological or economic impacts for this species.

* Content for this species is based on the literature and peer review is pending - if you have comments or feedback please contact Paul Fofonoff at

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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Marine Invasions Lab
Smithsonian Environmental Research Center

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