Comparative morphology of the genital acetabula of aquatic mites (Acari, Prostigmata): Hydrachnoidea, Eylaoidea, Hydryphantoidea and Lebertioidea

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Abstract
The genital acetabula of the more ancestral superfamilies of water mites show basic ultrastructural homologies in the porous acetabular cap and the basal ring sclerite. Morphological differences among the species studied are primarily in the size, shape and number of the acetabula and in their relationship to sclerites in the ventral body wall. The new information suggests two major independent evolutionary lineages among the genera of this study; they are termed here the thyadinelebertioid line and the wandesiine-eylaoid line.