The sperm pump of the hangingfly Bittacus planus Cheng (Mecoptera: Bittacidae)
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文摘

The male of Bittacus uses a sperm pump to transfer liquid sperm to the female.

The sperm pump mainly consists of a piston, a pumping chamber, and associated muscles.

The ejaculatory mechanism of the sperm pump is briefly discussed.

The phylogenetic significance of the sperm pump is briefly discussed.

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