Chasmistes liorus Jordan, 1878:219

June sucker



Taxonomy & Nomenclature

Synonym/s: Chasmistes liorus liorus Jordan, 1878:219; Chasmistes liorus mictus Miller & Smith, 1981:15


Conservation Status

Extinct (Burkhead, 2012)

Last record: 1800's; 1935 or earlier (Burkhead, 2012); 21 March 1959 (Miller, 1961)

IUCN RedList status: "may be extinct"


Estimated date of extinction: 1935 (Burkhead, 2012)



Utah Lake, Utah, USA


Biology & Ecology










Original scientific description:

Jordan, D. S. (1878). A synopsis of the family Catostomidae. Bull. U.S. Nat. Mus. 12: 97-237.

Other references:

Burkhead, Noel M. (2012). Extinction Rates in North American Freshwater Fishes, 1900–2010. BioScience 62(9): 798-808.

Day, David. (1981). The Doomsday Book of Animals: A Natural History of Vanished Species. New York, N.Y.: The Viking Press.

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.

Jordan, D. S. (1891). Report of explorations in Colorado and Utah during the summer of 1889, with an account of the fishes found in each of the river basins examined. Bulletin of the U.S. Fish Commission 9: 1-40.

Jordan, D. S. and Gilbert, C. H. (1881). Notes on a collection of fishes from Utah Lake. Proc. U. S. Natl. Mus. 3: 459-465.

Miller, Robert Rush. (1961). Man and the changing fish fauna of the American southwest. Papers of the Michigan Academy of Science, Arts, and Letters 46: 365-404.

Miller, Robert Rush and Smith, G. R. (1981). Distribution and evolution of Chasmistes (Pisces: Catostomidae) in western North America. Occas. Pap. Mus. Zool. Univ. Mich. 696: 1-46.

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.

NatureServe. (2013). Chasmistes liorus. The IUCN Red List of Threatened Species. Version 2014.3. ( Downloaded on 26 January 2015.

Tanner, Vasco M. (1936). A study of the Fishes of Utah. Utah Acad. Sci., Arts and Letters 13: 155-184, pls. 1-3.

USFWS. (1986). Final rule determining the june sucker (Chasmistes liorus) to be an endangered species with critical habitat. United States Fish and Wildlife Service, March 31, 1986, 51 FR 10851.

Webb, Molly A. H. et al. (2023). Prioritizing Imperiled Native Aquatic Species for Conservation Propagation. Journal of Fish and Wildlife Management.

Whitney, Mike and Belk, Mark C. (2000). Threatened fishes of the world: Chasmistes liorus Jordan, 1878 (Catostomidae). Environmental Biology of Fishes 57: 362.


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