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cambarus cryptodytes


Scientific Name:  Cambarus (Jugicambarus) cryptodytes Hobbs

Rarity Ranks:  G2G3/S1

State Legal Status:  Threatened

Federal Legal Status:  None

Description:  This is the only albino crayfish known to occur in Georgia.  Eyes are present but not pigmented and the claws and legs are slender and appear fragile.  The antennae are approximately twice as long as the body.  This species reaches a maximum total body length of about 53 mm (2.1 in).

Similar Species:  This is the only known albino crayfish occurring in Georgia.

Habitat:  This species is known only from subterranean habitats.  It has been seen and collected in underwater caves and has also been collected from wells.

Diet:  Nothing is known about the diet of the Dougherty Plain Cave Crayfish.  Like other crayfishes, it is likely an opportunistic omnivore and may even prey on the troglobitic salamander Haideotriton wallacei (Sutton and Relyea 1971)

Life History:  Because this is a troglobitic species, very little is known of its life history.  Males in reproductive condition have been collected in July, September, and October; no females with eggs have been found (Hobbs 1981).  Some researchers hypothesize that cave crayfishes live for several decades.

Survey Recommendations:  Purvis and Opsahl (2005) were able to catch several individuals of this species in study wells with a modified funnel trap.  SCUBA diving in springs along the Flint River has also yielded specimens of this species.

Range:  All records of the Dougherty Plain Cave Crayfish are from the Dougherty Plain physiographic province, a karst topography where springs, seeps, and caves have formed within the limestone geology.  The species is currently known from Dougherty and Decatur counties in southwestern Georgia and Jackson and Washington counties, Florida (Hobbs 1981; 1989).  It almost certainly occurs in Mitchell and Baker counties, Georgia, as they lie between Dougherty County, GA and Decatur County, FL.

Threats:  Small range size makes this species vulnerable to extirpation from the state.  Excessive water withdrawals from the Floridian Aquifer reduce the amount of habitat for the Dougherty Plain Cave Crayfish.  Runoff of pesticides and nutrients from agricultural areas is also a threat.

Georgia Conservation Status:  Because this species inhabits subterranean waters it is virtually impossible to protect specific populations.

Conservation and Management Recommendations:  Restrict access to sensitive cave habitats. Use vegetated buffers around groundwater recharge areas and streams to protect water quality within caves.  Identify levels of groundwater withdrawal that are compatible with aquatic habitat needs for crayfishes and other troglobites.

Selected References:

Hobbs, H. H., Jr. 1981. The crayfishes of Georgia. Smithsonian Contributions to Zoology 318:1-549. 

Hobbs, H. H.,  Jr. 1989. An illustrated checklist of the American crayfishes (Decapoda: Astacidae, Cambaridae, and Parastacidae). Smithsonian Contributions to Zoology 480:1-236.

Purvis, K.M. and S. Opsahl. 2005. A novel technique for invertebrate trapping in groundwater wells identifies new populations of the troglobitic crayfish, Cambarus cryptodytes, in southwest Georgia, USA. Journal of Freshwater Ecology 20:361-365.

Sutton, B. and K. Relyea. 1971. Notes on the Georgia blind cave salamander, Haideotriton wallacei (Amphibia: Plethodontidae). (Abstract) ASB Bulletin 18(2)58.

Taylor, C. A., G. A. Schuster, J. E. Cooper, R. J. DiStefano, A. G. Eversole, P. Hamr, H. H. Hobbs III, H. W. Robison, C. E. Skelton, and R. F. Thoma. 2007.  A reassessment of the conservation status of crayfishes of the United States and Canada after 10+ years of increased awareness. Fisheries 32(8)372-389.

cambarus cryptodytes mapDate Compiled or Updated:  September 2012

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