Algansea
Introduction '''''Algansea''''' is a genus of ray-finned fish in the family Leuciscidae, distributed in the Lerma–Chapala–Grande de Santiago, Pátzcuaro, Armería, Ameca, Ayutla and Tuxpan basins in west-central Mexico (mostly Jalisco, but also surrounding states and the State of Mexico). The genus includes both species that are locally numerous, and species that are highly threatened. Their closest relative is the longfin dace (''Agosia chrysogaster''). ''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 gill covers 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'' Pérez-Rodríguez, Pérez-Ponce de León, Domínguez-Domínguez & Doadrio, 2009 (Ameca chub)* ''Algansea aphanea'' C. D. Barbour & R. R. Miller, 1978 (riffle chub)* ''Algansea avia'' C. D. Barbour & R. R. Miller, 1978 (remote chub)* ''Algansea barbata'' Álvarez & Cortés, 1964 (Lerma chub)* ''Algansea lacustris'' Steindachner, 1895 (Pátzcuaro chub)* ''Algansea monticola'' C. D. Barbour & Contreras-Balderas, 1968 (mountain chub)* ''Algansea popoche'' (D. S. Jordan & Snyder, 1899) (popoche chub)* ''Algansea tincella'' (Valenciennes, 1844) (spottail chub)
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