Cambarus monongalensis

{{Short description|Species of crayfish}}

{{Speciesbox

| image = Blue Crayfish - Cambarus monongalensis (165812772).jpg

| image_caption =

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Cordeiro, J.|author2= Jones, T. |author3= Thoma, R.F. |name-list-style=amp |year= 2010 |title=Cambarus monongalensis |page= e.T153730A4537504 |doi=10.2305/IUCN.UK.2010-3.RLTS.T153730A4537504.en|access-date=29 January 2023}}

| status2 = G4

| status2_system = TNC

| status2_ref = {{cite web |title=Cambarus monongalensis |url=https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.1163458/Cambarus_monongalensis |website=NatureServe Explorer An online encyclopedia of life |version=7.1|publisher=NatureServe|access-date=29 January 2023}}

| genus = Cambarus

| species = monongalensis

| authority = Ortmann, 1905

|

}}

Cambarus monongalensis, the blue crayfish or Monongahela crayfish, is a species of burrowing crayfish native to Pennsylvania and West Virginia.Loughman, Lieb, Scott, Dillard & Sadecky (2017). Historical and current distribution of Appalachian primary burrowing crayfishes (Decapoda: Astacoidea: Cambaridae) in western Pennsylvania: a century of change or stasis? Journal of Crustacean Biology 37(5):1-9.Foltz II, Damis, Sadecky, Cyprych & Loughman (2016). The crayfish of Tomlinson Run State Park, Hancock County, West Virginia, USA. Freshwater Crayfish 2016: 1–8. It has also been found recently in Ohio.{{Cite journal|author=Mael G. Glon |author2= Laura S. Hughes |author3=Heather E. Glon |author4=Kelly M. Capuzzi |author5=Zachary J. Loughman |author6= Roger F. Thoma |name-list-style=amp |title= First Record of the Blue Crawfish, Cambarus monongalensis Ortmann, 1905 (Decapoda: Cambaridae), from Ohio, USA|date=2020-09-17 |journal=The Ohio Journal of Science |volume= 120 |issue= 2 |page= 57 |doi=10.18061/ojs.v120i2.7693|s2cid= 224824806 |doi-access=free }} The common name refers to the Monongahela River, with the first specimens being collected from Edgewood Park, Allegheny County, Pennsylvania.{{cite web |url=https://academic.oup.com/jcb/article/37/5/615/4060680?login=false |work=The Crayfish and Lobster Taxonomy Browser |title=An updated classification of the freshwater crayfishes (Decapoda: Astacidea) of the world, with a complete species list |author1=Keith A Crandall |author-link1=Keith A. Crandall |author2=Sammy De Grave. |publisher=Oxford University Press}} It is included on the IUCN Red List as a species of Least Concern.

It should not be confused with Procambarus alleni, also known as the blue crayfish, which is endemic to Florida and a popular aquarium crustacean.