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All life stages of Gamasellodes vermivorax n. sp. (Mesostigmata: Ascidae), a predator of mites, collembolans, and nematodes in semiarid grassland soils, are described. Female to female generation time is 10 days on a diet of rhabditid nematodes at 24 °C. Each adult female may produce one to three eggs daily for at least 2 weeks. Female deutonymphs are guarded by adult males. Isolated female deutonymphs molt to adults which begin laying eggs within 48 h of emergence. All eggs laid by unfertilized females develop into males, indicating a haplodiploid sex determination mechanism. In a microcosm experiment, nematode densities were negatively correlated with G. vermivorax densities.
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David Evans Walter (1987) studied this question.
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