Neogobius melanostomus Photo credit: © Mauro Hilário/Flickr
Callitriche stagnalis Photo credit: © per.aasen/Flickr
Viviparus georgianus Photo credit: © Thomas Palmer/Flickr
Akebia quinata Photo credit: © Woolbeding Gardens/Paul Gallivan
High Priority Species
Species deemed as "High Priority" are defined as being
exotic, invasive species which are:
1. Found in Pennsylvania but are not yet widespread (occurring in less than 1/3 of Pennsylvania counties).
2. Considered at least moderately invasive.
View photos and profiles for some of the species listed in this category.
Note: Species list updated in September 2021.