Causey’s Crayfish
A native Colorado crayfish found statewide.
About This Species
Causey's crayfish is a native crustacean, but was not described until fairly recently (1967). Prior to its description specimens were recorded as "atypical O. virilis." Its life history indicates that it has high reproductive potential.
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Physical Characteristics
Causey's crayfish is very similar in appearance to O. virilis, or "northern crayfish," but there are subtle differences. In Causey's crayfish, the outer tip of the mesial projection of the first pleopod (swimmeret) has a leaf-like thickening.
Habitat
Causey's crayfish is a habitat generalist, with an incredible ability to adapt and cope with different aquatic habitats and water qualities. It is also tolerant of temperatures from 33°F to 90°F. It is generally found in relation to a range of substrates including rocks, sand and mud. The most common burrow for Causey's crayfish is a tunnel under rocks embedded in the substrate. Causey's crayfish has been found in reservoirs, ponds, and streams. It inhabits the Rio Grande and the Canadian River. The headwaters of the Canadian are in Colorado, so this species may be present in Lake Dorothy SE of Trinidad. Causey's crayfish has an extensive range including: Colorado (southwest), New Mexico, Texas, Arkansas, Oklahoma, Missouri, and Kansas. However, it has been introduced to New Mexico and Arizona as well, possibly through its use as bait.
Threats to Species
There are no known major threats to Causey’s crayfish, but it is likely that localized declines are occurring from water pollution, diversion and loss through irrigation. In Oklahoma Causey’s crayfish is classified as “critically imperiled”.