Abstract
Morphological characteristics common to both sexes in 46 species, including exemplars from six genera and four tribes, of the family Phytoseiidae were compared interspecifically, intergenerically, and intertribally. The relationships between the sexes were quantified in terms of correlation coefficients and model II linear regression analyses, comparing the same set of morphological characters in both sexes. It is shown that there is a high degree of association between the males and females of a species despite their obvious morphological differences and that these relationships vary among some systematic groupings. The quantified differences shown between some taxa permit speculation on the phylogenetic relationships between the species studied. The quantitative relationships between the sexes in most cases are shown to be unique for males and females of the same species, offering a numerical method of identifying unknown male specimens. Many morphological characteristics are shown to be consistently shared by both sexes.
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