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Hourstonius sp.
Image courtesy of University of Bergen, Natural History Collections - via and CC BY-NC-SA. Image is of Gitanopsis arctica, a similar species to the unidentified Hourstonius sp. discussed here.
Hourstonius sp.
Taxonomic Group: Crustaceans-Amphipods


Hourstonius sp. is a small, unidentified estuarine and marine gammarid amphipod. It was reported from marine invertebrate and alga fouling communities in Chesapeake Bay (Virginia and Maryland) in the mid-1990’s and is thought to be established. Historical records show no reports of this species, or any sibling species, in the area prior to the 1970’s. As its full identity is still unknown, so are many of its life history and biogeographical characteristics. We consider its most likely native range to be the West Atlantic south of Cape Hatteras, North Carolina. However, given the global distribution of this genus, other source regions cannot be ruled out until this species is properly identified.

* 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
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