Species deemed as "Early Detection" are defined as being exotic, invasive species which fit any of the following descriptions:
1. Newly established in Pennsylvania.
2. Thought to be in Pennsylvania but not well documented.
3. Not found in Pennsylvania but expected to arrive and considered moderately invasive.
Alternanthera philoxeroides Photo credit: Melissa McMasters/Flickr
Procambarus clarkii Photo credit: © Ted van den Bergh/Flickr
Cirsium palustre Photo credit: © Rea Brinkhoff/Flickr
Channa micropeltes Photo credit: JW/Flickr
Early Detection Species
View photos and profiles for many of the species listed in this category.
Not present: Species not yet found in Pennsylvania.
Uncommon: Species found in Pennsylvania, but still very rare.
Found only in its PA native range: This species is native to parts of Pennsylvania; if found in other parts of the state, it may be suspected of being an invasive species.
Note: Species list updated in September 2021.