Catalog Number: USNM 211263
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): R. Miller & R. Schultz
Year Collected: 1959
Locality: Mexico: Arroyo Del Azufre At Banos De Azufre, 10 km W. of Teapa, Tabasco. Elev. 150 m, Tabasco, Mexico, North America
- Paratype: Miller, R. R. 1975. Occasional Papers of the Museum of Zoology, University of Michigan. No. 672: 19.
Habitat and Ecology
IUCN Red List Assessment
Red List Category
Red List Criteria
- Needs updating
- 1994Rare (R)
- 1990Rare (R)
The widemouth gambusia (Gambusia eurystoma) is a species of fish in the family Poeciliidae of the order Cyprinodontiformes. It is endemic to Mexico, specifically to the Baños del Azufre (Grijalva River basin) near Teapa, Tabasco. The Baños del Azufre are sulfidic springs that contain high concentrations of toxic hydrogen sulfide (H
2S). This prevents most animals from living in them; the only other fish found in the toxic sections of Baños del Azufre is the sulphur molly (Poecilia sulphuraria).
This species reaches a maximum overall length around 3.5 cm (1.4 in).
Little is known about G. eurystoma, but the IUCN classifies it as Critically Endangered on the basis of a very small (less than 250 individuals) and rapidly falling population and a small, localized, and diminishing geographical distribution.
- Tobler; Riesch; García de León; Schlupp; & Plath (2008). Two endemic and endangered fishes, Poecilia sulphuraria (Alvarez, 1948) and Gambusia eurystoma Miller, 1975 (Poeciliidae, Teleostei) as only survivors in a small sulphidic habitat. Journal of Fish Biology 72: 523–533.
- Contreras-Balderas, S. & Almada-Villela, P. (1996). "''Gambusia eurystoma". IUCN Red List of Threatened Species. Version 2.3. International Union for Conservation of Nature.
- Froese, Rainer and Pauly, Daniel, eds. (2004). "Gambusia eurystoma" in FishBase. October 2004 version.
- "Gambusia eurystoma". Integrated Taxonomic Information System. Retrieved 12 December 2004.