Cambarus subterraneus
Cambarus subterraneus, the Delaware County cave crayfish, is a species of crayfish in the family Cambaridae. It has been found only in three caves in Delaware County, Oklahoma. The IUCN conservation status of Cambarus subterraneus is "CR", critically endangered. The species faces an extremely high risk of extinction in the immediate future. The IUCN status was reviewed in 2010. References

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Cambaridae
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Crustaceans described in 1993
Cave crayfish
Endemic fauna of Oklahoma
Endemic crustaceans of the United States