Eucheira socialis (Pieridae) is found throughout the Mexican highlands above 1800 meters. Cytogenetic studies of four populations from four Mexican states (Sinaloa, Durango, Mexico, Oaxaca) revealed extreme variation in numerous classes of meiotic abnormalities. These classes included: irregular chromosome pairing during metaphase I, chromosome lagging during anaphase I, the production of micronuclei associated with apparently normal spermatids, and a variable number of chromosomal elements from cell to cell within the same animal. Previously documented biases in the primary sex ratio correlated with the relative degree of meiotic abnormalities.
Species 1: Lepidoptera Pieridae Eucheira socialis (Madrone butterfly)
Keywords: chromosome behavior, cytogenetics
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