Thermosphaeroma thermophilum Richardson, 1897

Socorro isopod



Taxonomy & Nomenclature



Conservation Status

Extinct in the wild

Last record: August 1988 or September 1988

IUCN RedList status: Extinct in the Wild



Baja California, Mexico & Socorro County, New Mexico, USA


Biology & Ecology




USNM 86450 (40 specimens)

USNM 86451 (90 specimens)

USNM 108862 (632 specimens)

USNM 108863 (437 specimens)


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Original scientific description:

Richardson, H. (1897). Description of a new crustacean of the genus Sphaeroma from a warm spring in New Mexico. Proceedings of the U. S. National Museum 20: 465-466.


Other references:

Inland Water Crustacean Specialist Group. (1996). Thermosphaeroma thermophilum. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. ( Downloaded on 26 May 2013.

Jormalainen V. and Shuster S. M. (1997). Microhabitat segregation and cannibalism in an endangered freshwater isopod, Thermosphaeroma thermophilum. Oecologia 111: 271–279.

Jormalainen V. and Shuster S. M. (1999). Female reproductive cycles and sexual conflict over precopulatory mate-guarding in Thermosphaeroma isopods. Ethology 105: 233–246.

Jormalainen V., Shuster S. M. and Wildey H. C. (1999). Reproductive anatomy, precopulatory mate guarding, and paternity in the Socorro isopod, Thermosphaeroma thermophilum. Mar. Freshwater Behav. Physiol. 32: 39–56.

Ketner R. L., Shuster S. M. and Lang B. K. (2002). The effects of cannibalism on life history characteristics in the endangered Socorro Isopod, Thermosphaeroma thermophilum (Crustacea: Isopoda). J. Arizona-Nevada Acad. Sci. 37: 6–7.

Lang, B. K., D. A. Kelt, and S. M. Shuster. (2006). The role of controlled propagation on an endangered species: demographic effects of habitat heterogeneity among captive and native populations of the Socorro isopod (Crustacea: Flabellifera). Biodiversity and Conservation 2006: (pagination?).

Shuster, S. M. (1981a). Life history characteristics of Thermosphaeroma thermophilum, the Socorro isopod (Crustacea: Peracarida). Biol. Bull. 161: 291–302.

Shuster S. M. (1981b). Sexual Selection in the Socorro isopod, Thermosphaeroma thermophilum (Cole) (Crustacea: Peracarida). Anim. Behav. 29: 698-707.

Shuster S.M., Miller M.P., Lang B.K., Zorich N., Huynh L. and Keim P. (2005). The effects of controlled propagation on an endangered species: genetic differentiation and divergence in body size among native and captive populations of the Socorro isopod (Crustacea: Flabellifera). Conserv. Genet. 6: 355–368.

United States Fish and Wildlife Service. (1982). Socorro Isopod ([i]Thermosphaeroma thermophilum[/i]) Recovery Plan. Albuquerque, New Mexico.


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