Procambarus milleri 

Scope: Global
Language: English

Translate page into:

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Malacostraca Decapoda Cambaridae

Scientific Name: Procambarus milleri Hobbs, 1971
Common Name(s):
English Miami Cave Crayfish

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2010
Date Assessed: 2010-06-01
Assessor(s): Cordeiro, J., Moler, P. & Crandall, K.A.
Reviewer(s): Collen, B. & Richman, N.
Contributor(s): Soulsby, A.-M., Batchelor, A., Dyer, E., Whitton, F., Livingston, F., Crandall, K.A., Milligan, H.T., Smith, J., Lutz, M.L., De Silva, R., McGuinness, S., Kasthala, G., Jopling, B., Sullivan, K. & Cryer, G.
Procambarus milleri has been assessed as Endangered under criterion B1ab(iii). This species has an estimated extent of occurrence of 210 km2 and is known from between 1 - 3 locations. This species is threatened across its range as a result of groundwater abstraction and pollution of the aquifer. Urgent measures are needed to assess the population status at each site and required conservation measures.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species was formerly known from two localities in Miami, Dade County, Florida (Franz et al. 1994). These two sites were 24 km apart (Radice and Loftus 1995). This species was recently found again in 1992 (Radice and Loftus 1995), after last being recorded in 1968 and subsequently described three years later (Hobbs 1971). This species is now known from 14 -15 sites in southern Dade County, mostly from man-made groundwater wells (P. Moler pers. comm. 2010). All known occurrences are found within an area of 210 km2 (30 km x 7 km NatureServe 2009).
Countries occurrence:
United States (Florida)
Additional data:
Number of Locations:1-3
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:According to Radice and Loftus (1995), seven individuals have been recorded over a two month period, and several were recorded at the original site, although the exact number was not specified (Hobbs 1971).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:This species is found in subterranean habitats (Radice and Loftus 1995). Nutrients enter the wells, through holes and crevices on the Florida pinelands and marshes, which allow plant and other detritus to filter down into the cave system (Radice and Loftus 1995). Loftus et al. (2001) found that this species inhabits deep geological fomations, greater than 5 m beneath the Rocky Glades, with voids of various dimensions that flood periodically but always contain water. The drilling of groundwater abstraction wells seems to provide suitable habitat for this species (P. Moler pers. comm. 2010).

Use and Trade [top]

Use and Trade: Since this species' rediscovery, seven specimens have been used to establish a captive breeding programme and are now being sold into the aquarium trade due to their suitability to aquarium life and attractive colour (Radice and Loftus 1995).

Threats [top]

Major Threat(s): This species is threatened by groundwater pollution from nearby urban areas, and salt water intrusion due to groundwater abstraction for domestic, agricultural and industrial purposes (Franz et al. 1994). This species is seemingly tolerant of well digging activity (P. Moler pers. comm. 2010).

Conservation Actions [top]

Conservation Actions:

This species has been given a NatureServe Global Heritage Status Rank of G1, and has been assigned an American Fisheries Society Status of 'endangered' based on its restricted range and ongoing habitat degradation (Taylor et al. 2007, NatureServe 2009). Further research is needed on the population status at each site and appropriate conservation measures for each.


Citation: Cordeiro, J., Moler, P. & Crandall, K.A. 2010. Procambarus milleri. The IUCN Red List of Threatened Species 2010: e.T18204A7800206. . Downloaded on 19 June 2018.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please provide us with feedback so that we can correct or extend the information provided