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Karyology of the Cyprinodontoid Fishes of the Mexican Family Goodeidae

Teruya Uyeno, Robert Rush Miller and John Michael Fitzsimons
Copeia
Vol. 1983, No. 2 (May 6, 1983), pp. 497-510
DOI: 10.2307/1444395
Stable URL: http://www.jstor.org/stable/1444395
Page Count: 14
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Karyology of the Cyprinodontoid Fishes of the Mexican Family Goodeidae
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Abstract

Karyotypes from 60 populations classified in 17 genera and 35 species of Mexican fishes of the autochthonous family Goodeidae vary from 24 metacentric to 48 subtelocentric-telocentric chromosomes in the diploid complement. About two-thirds of the family have 2n = 48 with terminal or near-terminal centromere positions, a condition regarded as ancestral for goodeids. Reduction of chromosome number has occurred solely by the formation of metacentric elements by Robertsonian fusion of pairs of (probably subtelocentric or acrocentric) chromosomes. It is not possible to determine relationships of the Goodeidae totally on the basis of karyotypes.

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