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The Tecopa pupfish (Cyprinodon nevadensis calidae), a subspecies of the Saratoga pupfish (Cyprinodon nevadensis) from the family Cyprinodontidae was discovered in 1942 in the Tecopa Hot Springs in California. It was first described by Robert Rush Miller in 1948. Its decline began in the early 1940s when the northern and the southern spring which were about 10 yards apart were canalized and bathhouses were build. The popularity of Tecopa Hot Springs in the 1950s and 1960s led to the building of hotels and trailer parks in that area. By 1981 the fish was officially delisted by the United States Fish and Wildlife Service and it became the first animal which was officially declared extinct according to the provisions of the Endangered Species Act from 1973.
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