Abstract
Field specimens ofEuseius mesembrinus (Dean) from Florida and Texas were found to be morphologically similar regardless of differences in the lengths of dorsal shield setae or the St IV macroseta. Populations from both states were reproductively compatible. Taxonomic characters ofE. mesembrinus were illustrated using both light and scanning electron microscopy. Lengths of dorsal shield setae and the macroseta on the tarsus of leg IV of field-collected specimens from Florida and Texas, laboratory cultures, and their crosses (F1) showed inconsistent variance. Multivariate analysis of variance and canonical discriminate analysis revealed that the source of variance can be attributed to ecological factors. The results suggest that the two populations are the same species and support the possibility that the Florida population originated from Texas.
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