Abstract
Abstract The sibling species Fundulus olivaceus and Fundulus notatus have karyotypes comprised of 48 and 40 chromosomes, respectively. The karyotype of F. notatus is probably derived from one similar to that of F. olivaceus by a Robertsonian change involving centric fusion. A hybrid swarm between F. olivaceus and F. notatus was identified and analyzed using chromosome numbers to distinguish hybrid and backcross individuals.
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