''Algansea'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fishes, is a class of bony fish. They comprise over 50% of living vertebrate species. The ray-finned fishes are so called because their fins are webs of skin supported by bony or hor ...

in the family

Leuciscidae Leuciscinae is a subfamily of the freshwater fish family Cyprinidae, which contains the true minnows. Members of the Old World (OW) clade of minnows within this subfamily are known as European minnows. As the name suggests, most members of the O ...

, distributed in the Lerma– Chapala– Grande de Santiago,

Pátzcuaro Pátzcuaro () is a city and municipality located in the state of Michoacán. The town was founded sometime in the 1320s, at first becoming the capital of the Purépecha Empire and later its ceremonial center. After the Spanish took over, Vasco de ...

, Armería,

Ameca Ameca may refer to: Biology * Ameca (fish), ''Ameca'' (fish), a monotypic ray-finned fish genus in the family Goodeidae, with the only species ''Ameca splendens'' Places in Mexico *Ameca, Jalisco, a city and municipality in central Jalisco *Chiefd ...

, Ayutla and

Tuxpan Tuxpan (or Túxpam, fully Túxpam de Rodríguez Cano) is both a municipality and city located in the Mexican state of Veracruz. The population of the city was 78,523 and of the municipality was 134,394 inhabitants, according to the INEGI census o ...

basins in west-central

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

(mostly

Jalisco Jalisco (, , ; Nahuatl: Xalixco), officially the Free and Sovereign State of Jalisco ( es, Estado Libre y Soberano de Jalisco ; Nahuatl: Tlahtohcayotl Xalixco), is one of the 31 states which, along with Mexico City, comprise the 32 Federal En ...

, but also surrounding states and the

State of Mexico The State of Mexico ( es, Estado de México; ), officially just Mexico ( es, México), is one of the 32 federal entities of the United Mexican States. Commonly known as Edomex (from ) to distinguish it from the name of the whole country, it is ...

). The genus includes both species that are locally numerous, and species that are highly

threatened Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensat ...

. Their closest relative is the longfin dace (''Agosia chrysogaster''). ''Algansea'' are fairly small fish that typically are between in

standard length Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology. Overall length * Standard length (SL) is the length of a fish m ...

, although ''A. lacustris'' and ''A. popoche'' can reach up to . The different species are generally quite similar in their appearance, being yellowish- or

olive The olive, botanical name ''Olea europaea'', meaning 'European olive' in Latin, is a species of small tree or shrub in the family Oleaceae, found traditionally in the Mediterranean Basin. When in shrub form, it is known as ''Olea europaea'' ...

-brown overall; darker on the upperparts and paler, more silvery on the underparts. They have a long blackish line along the side of the body from the

gill cover The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills; it is also used for respiration and feeding. Anatomy The opercular series contains four bon ...

s to the tail base, or a blackish spot at the base of the tail.

Species

There are currently eight recognized species in this genus: * ''

Algansea amecae ''Algansea amecae'', the Ameca chub, is a species of freshwater fish in the family Cyprinidae. It is endemic to the upper Ameca River basin in Jalisco, western Mexico Mexico (Spanish language, Spanish: México), officially the United Mexica ...

'' Pérez-Rodríguez, Pérez-Ponce de León, Domínguez-Domínguez & Doadrio, 2009 (Ameca chub) * ''

Algansea aphanea The riffle chub (''Algansea aphanea'') is a species of freshwater fish in the family Cyprinidae that is endemic to the Armería, Ayutla and Tuxpan river basins in Jalisco and Colima of west-central Mexico. This threatened Threatened specie ...

'' C. D. Barbour &

R. R. Miller Robert Rush Miller (April 23, 1916 – February 10, 2003) "was an important figure in American ichthyology and conservation from 1940 to the 1990s." He was born in Colorado Springs, earned his bachelor's degree at University of California, Berke ...

, 1978 (riffle chub) * '' Algansea avia'' C. D. Barbour &

, 1978 (remote chub) * '' Algansea barbata''

Álvarez Álvarez or Álvares may refer to: People *Álvarez (surname), Spanish surname Places *Alvares (river), a river in northern Spain * Alvares (ski resort), in Iran *Alvares, Iran * Alvares, Portugal *Álvarez, Santa Fe, a town in the province of Sa ...

& Cortés, 1964 (Lerma chub) * '' Algansea lacustris'' Steindachner, 1895 (Pátzcuaro chub) * '' Algansea monticola'' C. D. Barbour & Contreras-Balderas, 1968 (mountain chub) * ''

Algansea popoche The popoche chub (''Algansea popoche'') is a species of freshwater ray-finned fish in the genus ''Algansea'' of the family Cyprinidae. It is endemic to the Lake Chapala and nearby sections of associated rivers in Jalisco of west-central Mexico. T ...

'' ( D. S. Jordan & Snyder, 1899) (popoche chub) * '' Algansea tincella'' (

Valenciennes Valenciennes (, also , , ; nl, label=also Dutch, Valencijn; pcd, Valincyinnes or ; la, Valentianae) is a commune in the Nord department, Hauts-de-France, France. It lies on the Scheldt () river. Although the city and region experienced a s ...

, 1844) (spottail chub)

References

{{Leuciscinae-stub