Ecological Risk Screening Summary - Pontogammarus palmatus (an amphipod, no common name) - Uncertain Risk

Species that are considered uncertain risk need a more in-depth assessment beyond the Risk Summary to better define the species’ risk to U.S. environments.

Pontogammarus palmatus is an amphipod reportedly from the Caspian Sea basin. Little information is available for this species, and georeferenced occurrences are currently lacking. No introductions were found for P. palmatus. The history of invasiveness is classified as No Known Nonnative Population. The climate match for the contiguous United States was categorically high with the highest matches occurring in the Intermountain West and Upper Midwest. The certainty of this assessment is low due to a lack of information, potential taxonomic uncertainty, lack of georeferenced observations to use in the climate match, and unknown salinity requirements. The overall risk assessment category for P. palmatus is Uncertain.