Orconectes peruncus[1] Faxonius peruncus, the Big Creek crayfish, is a species of crayfish in the family Cambaridae.

[2] The common name refers to Big Creek, where the original specimens were found.

[3] F. peruncus is limited to the St. Francis River watershed.

[1] The main threat to this species is a related species, F. hylas which was introduced into the area in 1984.

[2] Also, pollution from the Southeast Missouri Lead District affects the water quality in the local area.