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Theoretical Parker, comparative Parker et al. The structure and operation of the reproductive organs of the genera Ephestia and Plodia Lepidoptera, Phycitidae. It appears that the spermatheca can eject sperm by such movement. In this scenario, the intermating duration may be determined by 2 factors: The benefits of male ejaculate sex peptide transfer in Drosophila melanogaster. Direct visualization of sperm competition and sperm storage in Drosophila. Data on the number or ratio of apyrene and eupyrene sperm in the spermatophore and spermatheca and copulation duration were analyzed using analysis of variance followed by Tukey's studentized range honestly significance difference test.