Chinese mitten crab
Chinese mitten crab

Eriocheir sinensis Photo credit: Neil Cummings/Flickr

Bloody red shrimp
Bloody red shrimp

Hemimysis anomala Photo credit: © Jean-François Cart/Flickr

Asian Clam
Asian Clam

Corbicula fluminea Photo credit: Illinois State Museum

Calico crayfish
Calico crayfish

Orconectes immunis Photo credit: © Mark Lethaby/Flickr

Invertebrates

Common: Species found in at least 1/3 of Pennsylvania counties.

Uncommon: Species found in Pennsylvania, but not widespread (i.e., found in less than 1/3 of Pennsylvania counties.)

Not present: Species not yet found in Pennsylvania.

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.

*Status column last updated in August 2016.