Biology and immature stages of snail-killing flies belonging to the genus Tetanocera (Insecta : Diptera : Sciomyzidae). III. Life histories of the predators of aquatic snails

The geographic distribution. life history, and larval feeding habits of ten species of Tetanocera that prey on aquatic pulmonate snails are presented. All species are generalist predators of a broad mix of aquatic pulmonate s nails. Differences in phenologies are apparent. Seven species are univoltin e, whereas three are multivoltine. Three species overwinter as pupae, one s pecies overwinters as partially grown larvae, and four species pass the win ter months as diapausing first-instar larvae within eggs.