Data from: Sperm morph and remating frequency in the Indian meal moth, Plodia interpunctella

Doko-Miles J. Thorburn, Robert J. Knell & Jonathan M. Parrett
All Lepidoptera produce two sperm types: normal, nucleated ‘eupyrene’ sperm and anucleate ‘apyrene’ sperm. One hypothesis for the evolution of apyrene sperm suggests that they act to reduce female remating rate. Apyrene sperm require less resources to produce than do eupyrene sperm, and could delay remating by females by acting as a “cheap filler”, packing the spermatheca and thereby reducing receptivity. This would reduce the risk of sperm competition, giving a potential adaptive advantage to...
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