Gambusia georgei Hubbs & Peden, 1969

San Marcos gambusia



Taxonomy & Nomenclature



Conservation Status

Last record: 1983 (Miller et al. 1989:33)

IUCN RedList status: Extinct


Apparently a captive population existed, which also became extinct during the 1980's (that is, within the same decade as the wild population is believed to have gone extinct).



San Marcos Springs, Texas, USA


Biology & Ecology







For a photograph of this species see: [ProBoards account needed to view]



Original scientific description:

Hubbs, Clark and Peden, A. E. (1969). Gambusia georgei sp. nov. from San Marcos, Texas. Copeia 1969: 357-364.


Other references:

Jelks, Howard L., Walsh, Stephen J., Burkhead, Noel M., Contreras-Balderas, Salvador, Díaz-Pardo, Edmundo, Hendrickson, Dean A., Lyons, J., Mandrak, Nicholas E., McCormick, Frank, Nelson, Joseph F., Platania, Steven P., Porter, Brady A., Renaud, Claude B., Schmitter-Soto, Juan Jacabo, Taylor, Eric B. and Warren, Melvin L. Jr. (2008). Conservation status of imperiled North American freshwater and diadromous fishes. Fisheries 33(8): 372-407.

Johnson, J. E. and Hubbs, Clark. (1989). Status and conservation of poeciliid fishes, pp. 301-317. In: Meffe, G. and Snelson, F. (eds.). Ecology and Evolution of Livebearing Fishes (Poeciliidae). New York: Prentice Hall.

Miller, R. R., Williams, J. D. and Williams, J. E. (1989). Extinctions of North American fishes during the past century. Fisheries 14(6): 22-38.

Suckling, Kieran, Slack, Rhiwena and Nowicki, Brian. (2004). Extinct and the Endangered Species Act. Centre For Biological Diversity. 63 pp.

USFWS. 1996. San Marcos and Comal Springs and Associated Aquatic Ecosystems (Revised) Recovery Plan. United States Fish and Wildlife Service, Albuquerque, NM.

World Conservation Monitoring Centre. (1996). Gambusia georgei. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. ( Downloaded on 31 May 2013.


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