Faxonius obscurus is a species of crayfish in the family Cambaridae.

It is an introduced species in adjacent regions, including Massachusetts, Vermont, and Ontario in Canada.

This species lives in slow-moving waterways and pools with rocky substrates, where it hides beneath rocks.

Other threats include water pollution, especially from mine runoff.

[1] It has become an introduced species itself in some areas, often when released from bait buckets.