KARYOLOGY OF FOUR NORTH AMERICAN PERCIDS (PERCIFORMES: PERCIDAE)

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Abstract
We have examined the chromosomes of four darter species (Percidae) from Texas and Louisiana: Percina caprodes, P. nigrofasciata, P. sciera and Ammocrypta vivax. All four have diploid complements of 48 chromosomes. Estimates of diploid chromosome arm number among the four species varied from 80 (P. sciera) to 92 (P. caprodes and A. vivax) to 94 (P. nigrofasciata); but between two to five chromosome pairs in each species could not be unequivocally classified as either uni-armed or bi-armed. Percina sciera, which was scored as having the highest number (16) of uni-armed chromosomes, probably differs in gross karyotype from the other three, but the magnitude of difference may be less than indicated by our measurements.