Algansea is a genus of ray-finned fish in the family Leuciscidae, distributed in the Lerma River–Lake Chapala–Grande de Santiago, Pátzcuaro, Armería, Ameca River, Ayutla River and Tuxpan basins in west-central Mexico (mostly Jalisco, but also surrounding states and the State of Mexico).[ Their closest relative is the longfin dace ( Agosia chrysogaster).][
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Algansea are fairly small fish that typically are between in standard length, although A. lacustris and A. popoche can reach up to .[ The different species are generally quite similar in their appearance, being yellowish- or olive-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 to the tail base, or a blackish spot at the base of the tail.][
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Species
There are currently eight recognized species in this genus:
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Algansea amecae Pérez-Rodríguez, Pérez-Ponce de León, Domínguez-Domínguez & Doadrio, 2009 (Ameca chub)
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Algansea aphanea C. D. Barbour & R. R. Miller, 1978 (riffle chub)
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Algansea avia C. D. Barbour & R. R. Miller, 1978 (remote chub)
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Algansea barbata Álvarez & Cortés, 1964 (Lerma chub)
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Algansea lacustris Steindachner, 1895 (Pátzcuaro chub)
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Algansea monticola C. D. Barbour & Contreras-Balderas, 1968 (mountain chub)
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Algansea popoche (D. S. Jordan & Snyder, 1899) (popoche chub)
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Algansea tincella (Valenciennes, 1844) (spottail chub)
