Unimodal Batesian polymorphism in the neotropical swallowtail butterfly Eurytides lysithous (Hbn.)
1994
West, D.A.
The Brazilian swallowtail Eurytides lysithous is evidently a Batesian mimic of several Parides species. It is polymorphic for mimetic patterns in both sexes. Various populations contain from one to three major forms, and these seem to depend on two unlinked loci or supergenes. Samples from natural populations, and one reared brood, suggest that one locus controls two white-marked forms, with incomplete dominance producing a third heterozygous form. The heterozygotes are everywhere deficient from Hardy-Weinberg expectations. The second putative locus has an allele epistatic to the first locus which converts the white-marked forms to black, but epistasis is apparently incomplete in heterozygotes. The incomplete dominance and epistasis result in extraordinarily variable polymorphic populations and would allow a genetic analysis for comparison with those already done in the classic Batesian polymorphic swallowtails of the Old World.
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