A new find of a shrimp, native from "the Black Sea of eastern Europe and western Asia" in Pennsylvania "2 or 3mm" in size.
https://www.pennlive.com/life/2019/10/new-invasive-species-found-in-pennsylvania-waters.html
https://www.pennlive.com/life/2019/10/new-invasive-species-found-in-pennsylvania-waters.html