Procambarus delicatus 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Malacostraca Decapoda Cambaridae

Scientific Name: Procambarus delicatus Hobbs & Franz, 1986
Common Name(s):
English Big-cheeked Cave Crayfish

Assessment Information [top]

Red List Category & Criteria: Critically Endangered (Possibly Extinct) B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2010
Date Assessed: 2010-06-01
Assessor(s): Crandall, K.A. & Cordeiro, J.
Reviewer(s): Collen, B. & Richman, N.
Contributor(s): Livingston, F., Soulsby, A.-M., Batchelor, A., Dyer, E., Whitton, F., Milligan, H.T., Smith, J., Lutz, M.L., De Silva, R., McGuinness, S., Kasthala, G., Jopling, B., Sullivan, K. & Cryer, G.
Procambarus delicatus has been assessed as Critically Endangered (possibly extinct) B1ab(iii)+B2ab(iii). This species has an extent of occurrence (EOO) less than 100 km², an area of occupancy (AOO) of 0.06 m², and is only known from one location. It has not been seen since 1976, however targeted surveys are required to determine whether it is in fact Extinct. This species habitat is under threat from activities such as snorkelling, SCUBA diving and swimming, and resulting pollution.
Date last seen: 1976
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is known from its type locality, a single spring within Ocala Natural Forest, Lake County, Florida (Hobbs and Franz 1986). This species has a distribution of less than 100 km².
Countries occurrence:
Possibly extinct:
United States (Florida)
Additional data:
Estimated area of occupancy (AOO) - km2:0.060
Number of Locations:1
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:In a study conducted by Relyea et al. (1976), one specimen was found outside of the subterranean system resting on a pile of loose debris and a second specimen was found at the main cave entrance by the main boil (an upheaval of water at the surface). Hobbs and Franz (1986) anticipate that the population of this species is small and that is why so few have been recorded. One more specimen of this species was collected in 1986 while seining the vegetation around a spring pool (P Moler pers. comm. 2010).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species is found in subterranean waters and springs (Hobbs and Franz 1986). This species is found in one pool where the water enters from numerous small openings and cracks, none of which are large enough for a person to enter (Hobb and Franz 1986). The spring is covered by numerous boils (upheaval of water at the surface) (Hobbs and Franz 1986). The substrate varies from sand to limestone rocks and boulders (Hobbs and Franz 1986). It is unknown how P. delicatus receives nutrients, however there is loose debris that accumulates in stagnant areas near the spring boils (Hobbs and Franz 1986).

Threats [top]

Major Threat(s): This species is threatened by disturbance from tourism. The spring is a major tourist attraction which is used for fishing, snorkelling, swimming, and is popular with SCUBA divers (Ocala National Forest Visitor Centre 2008), resulting in degraded habitat.

Conservation Actions [top]

Conservation Actions:

There are no species-specific conservation measures in place for this species. This species has been given a NatureServe Global Heritage Status Rank of G1, and was assigned an American Fisheries Society Status of 'endangered' (Taylor et al. 2007, NatureServe 2009). Surveys are needed to confirm the presence of this species.

Citation: Crandall, K.A. & Cordeiro, J. 2010. Procambarus delicatus. The IUCN Red List of Threatened Species 2010: e.T18196A7774195. . Downloaded on 21 May 2018.
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