''Fallicambarus tenuis'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of crayfish in the

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

Fallicambarus ''Fallicambarus'' is a genus of crayfish in the family Cambaridae from the United States and Canada. It includes 12 species, of which one is on the IUCN Red List as a vulnerable species A vulnerable species is a species which has been catego ...

'' in the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Cambaridae The Cambaridae are the largest of the four families of freshwater crayfish, with over 400 Species. Most of the species in the family are native the United States east of the Great Divide and Mexico, but fewer range north to Canada, and south to ...

. It was the only species in the subgenus ''Procambarus (Tenuicambarus)'' before DNA analysis suggested a reclassification. ''Fallicambarus tenuis'' is rare throughout its range, which is restricted to the

Ouachita Mountains The Ouachita Mountains (), simply referred to as the Ouachitas, are a mountain range in western Arkansas and southeastern Oklahoma. They are formed by a thick succession of highly deformed Paleozoic strata constituting the Ouachita Fold and Thru ...

Le Flore County, Oklahoma LeFlore County is a county along the eastern border of the U.S state of Oklahoma. As of the 2010 census, the population was 50,384. Its county seat is Poteau. The county is part of the Fort Smith metropolitan area and the name honors a Choct ...

and Polk County, Arkansas.

References

Cambaridae Endemic fauna of the United States Ouachita Mountains Natural history of Oklahoma Natural history of Arkansas Freshwater crustaceans of North America Crustaceans described in 1950 Taxa named by Horton H. Hobbs Jr. {{Crayfish-stub