Cyprinodon is a genus of pupfishes found in waters that range from fresh to hypersaline. The genus is primarily found in Mexico, the Caribbean Islands and southern United States, but C. variegatus occurs as far north as Massachusetts and along the entire Gulf of Mexico coastline, and C. dearborni and C. variegatus are found in northern South America. Many species have tiny ranges and are highly threatened, in some cases already extinct. Cyprinodon are small; the largest reaches 10 cm (3.9 in) in length and most other species only reach about half that size.
The largemouth shiner is a critically endangered species of cyprinid fish. It is found only in the Guzmán Basin in northwestern Chihuahua, Mexico, where it is called sardinita bocagrande. In 2012, it only survived in a single spring, which also was the last remaining habitat for the Carbonera pupfish and the dwarf crayfish Cambarellus chihuahuae. As this single spring was declining, it was decided to move some individuals of all three species to a nearby refuge in 2014 as a safeguard. The largemouth shiner grows to a standard length of 4.1 cm (1.6 in).
Potosi pupfish is a species of fish in the family Cyprinodontidae. It is endemic to Mexico, but is now extinct in the wild, only surviving in captivity.
Blackfin pupfish is a species of fish in the family Cyprinodontidae. This pupfish is endemic to Lake Chichancanab in Quintana Roo, Mexico. In almost all places, different Cyprinodon species do not overlap in their range, but there are two notable exceptions and one of these is Lake Chichancanab, which is inhabited by C. beltrani, C. esconditus, C. labiosus, C. maya, C. simus, C. suavium and C. verecundus. Among the endemic Cyprinodon species in Lake Chichancanab, only C. beltrani and C. labiosus still occur in some numbers in their habitat, while the remaining are virtually—if not fully—extinct in the wild. This species feeds on detritus. Compared to the other species of pupfish mentioned previously, the C. beltrani prefer a different feeding substrate. In regards to mating, the female Blackfin pupfish seems to not mate with other species of pupfish and not just the C. beltrani. The male blackfin pupfish have similar markings and courting behaviors to other pupfish in their habitat. The person honored in the specific name of this pupfish is the Mexican biologist Enrique Beltrán Castillo (1903-1994) to mark his quarter century of being a biologist.
The Leon Springs pupfish is a species of fish in the family Cyprinodontidae. It is endemic to Pecos County, Texas in the United States. It is a federally listed endangered species.
Cyprinodon ceciliae is an extinct species of pupfish. It was endemic to the Ojo de Agua la Presa in southwestern Nuevo Leon state in Mexico, but disappeared in 1990 due to habitat loss. The same freshwater spring system was the home of three other pupfish: Cyprinodon inmemoriam (extinct), Cyprinodon longidorsalis and Cyprinodon veronicae. Although these were from the same spring system, each was restricted to its own individual spring and associated waters. The exact spring and associated waters inhabited by the Villa Lopez pupfish were also the home of a now-extinct, undescribed species of Cambarellus crayfish. The specific name honours the daughter of María de Lourdes Lozano-Vilano and niece of Salvador Contreras-Balderas, Cecilia Contreras Lozano, who assisted on the trip on which the type was collected.
The Carbonera pupfish, also known as the Perrito de carbonera, is a small, endangered species of pupfish in the family Cyprinodontidae. It is endemic to springs and associated waters at Bolsón de los Muertos in northwestern Chihuahua, Mexico. It was last rated by the IUCN in 1996 where considered endangered, but most subpopulations now appear to be extirpated, while a few are extinct in the wild. In 2012, it only survived in the wild in a single spring, which also was the last remaining habitat for the largemouth shiner and the dwarf crayfish Cambarellus chihuahuae. As this single spring was declining, it was decided to move some individuals of all three species to a nearby refuge in 2014 as a safeguard.
The Cachorrito de la Trinidad, also known in English as the Charco Azul pupfish, was a small species of fish in the family Cyprinodontidae. It was endemic to Ojo de Agua la Presa in southwestern Nuevo Leon state in Mexico, but became extinct in 1985 due to habitat loss. The same freshwater spring system was the home of three other pupfish: Cyprinodon ceciliae (extinct), Cyprinodon longidorsalis and Cyprinodon veronicae. Although these were from the same spring system, each was restricted to its own individual spring pool. The spring pond inhabited by the Charco Azul pupfish was also the home of a now-extinct, undescribed species of Cambarellus crayfish. The specific name inmemoriam means "in memory" and signifies the extinction of the species due to its native spring being dried out by groundwater extraction soon after the discovery of this fish in 1983.
The thicklip pupfish, known is Spanish as Cachorrito cangrejero, is a species of fish in the family Cyprinodontidae. This pupfish is endemic to Lake Chichancanab in Quintana Roo, Mexico. In almost all places, different Cyprinodon species do not overlap in their range, but there are two notable exceptions and one of these is Lake Chichancanab, which is inhabited by C. labiosus, C. beltrani, C. esconditus, C. maya, C. simus, C. suavium and C. verecundus. Among the endemic Cyprinodon species in Lake Chichancanab, only C. beltrani and C. labiosus still occur in some numbers in their habitat, while the remaining are virtually—if not fully—extinct in the wild.
The Parras pupfish is a small species of freshwater pupfish in the family Cyprinodontidae. It is endemic to the Laguna de Mayrán basin in southern Coahuila, Mexico. This species was widely thought to be extinct, 1903 being the date of the last recorded observation and it was declared to be extinct in 1930 until a single specimen was accidentally collected from an irrigation canal, in the town of Parras de la Fuente in 2012.
Cyprinodon longidorsalis, the cachorrito de charco palmal or La Palma pupfish, is a species of fish in the family Cyprinodontidae. It was endemic to the Ojo de Agua la Presa in southwestern Nuevo Leon state in Mexico, but became extinct in the wild in 1994 due to habitat loss. The same freshwater spring system was the home of three other pupfish: Cyprinodon ceciliae (extinct), Cyprinodon inmemoriam (extinct) and Cyprinodon veronicae. Although these were from the same spring system, each was restricted to its own individual spring pool. The Charco La Palma pool and its spring had a combined area of about 10 m2 (110 sq ft) and was no more than 1.4 m at the deepest point, making the range of the La Palma pupfish perhaps the smallest known for any vertebrate species. This tiny spring pond also was the home of a now-extinct, undescribed species of Cambarellus crayfish.
The Maya pupfish, known in Spanish as cachorrito gigante, is a highly threatened species of fish in the family Cyprinodontidae. It is endemic to Lake Chichancanab in Quintana Roo, Mexico. In almost all places, different Cyprinodon species do not overlap in their range, but there are two notable exceptions and one of these is Lake Chichancanab, which is inhabited by C. maya, C. beltrani, C. esconditus, C. labiosus, C. simus, C. suavium and C. verecundus. Living together, the Cyprinodon species in Lake Chichancanab have diverged into different niches. Pupfish typically feed on algae and detritus. In Lake Chichancanab, however, C. maya has become not only the largest species in the genus Cyprinodon, up to 10 cm (3.9 in) long, but also the only that catches and eats whole fish. In smaller quantities it eats ostracods and freshwater snails.
The Mezquital pupfish is a species of pupfish in the family Cyprinodontidae. It is endemic to Durango in Mexico. This species was described by Robert Rush Miller in 1976 from a pond which was fed by hot springs within the basin of the Río del Tunal, approximately 9 kilometres (5.6 mi) east of Durango City at an altitude of about 1,880 metres (6,170 ft). The specific name honors the American ichthyologist Seth Eugene Meek (1859-1914), a pioneer of the study of the freshwater fish of Mexico.
The boxer pupfish is a small species of pupfish in the family Cyprinodontidae. It is endemic to Lake Chichancanab in Quintana Roo, Mexico.
The perritos de sandia was an undescribed species of fish in the family Cyprinodontidae, which is now considered extinct. It was endemic to Mexico.
The largefin pupfish, also known as cachorrito de dorsal larga, is a small species of pupfish in the family Cyprinodontidae. It is endemic to Lake Chichancanab in Quintana Roo, Mexico. In almost all places, different Cyprinodon species do not overlap in their range, but there are two notable exceptions and one of these is Lake Chichancanab, which is inhabited by C. verecundus, C. beltrani, C. esconditus, C. labiosus, C. maya, C. simus and C. suavium. Living together, the Cyprinodon species in Lake Chichancanab have diverged into different niches. Pupfish typically feed on algae and detritus. In Lake Chichancanab, however, C. verecundus has become an amphipod- and bivalve-eater.
The Catarina pupfish was a diminutive species of fish in the family Cyprinodontidae, first described in 1972. It was endemic to a spring in Nuevo León, Mexico. In an attempt of saving the rapidly declining species, some were brought into captivity in the late 1980s and early 1990s, but it proved very difficult to maintain. In 1994 it became extinct in the wild. Gradually the captive populations also perished. The last male died in 2014 and the species became extinct.
Cambarellus is a genus of small freshwater crayfish in the family Cambaridae. The 19 species are found in Mexico and the Gulf States of the United States. Among the Mexican species, C. areolatus, C. patzcuarensis, and C. prolixus are considered seriously threatened by the IUCN, and C. alvarezi is already extinct. C. chihuahuae was also believed to be extinct until rediscovered in 2012. C. alvarezi and four undescribed, extinct Cambarellus species were restricted to desert spring systems in southwestern Nuevo León; each one shared its habitat with a Cyprinodon pupfish.
The Julimes pupfish is a species of killifish in the family Cyprinodontidae. This pupfish is endemic to El Pandeño, a hot spring in Julimes, Chihuahua, Mexico, and it is adapted to life in water that reaches temperatures as high as 46 °C (114 °F). Consequently, it has been referred to as the "hottest fish in the world", although the closely related Cyprinodon pachycephalus can occur in somewhat warmer waters. Cyprinodon julimes was scientifically described in 2009 as similar to Cyprinodon eximius, but it has a bigger head, nearly one-third of its standard length.
Edwin Philip Pister is a fishery biologist who worked for California Department of Fish and Game. He was a pioneer of desert fish conservation, and is credited with saving the Owens pupfish by transferring the entire remaining population into several buckets and transporting them to a safe location.
