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| intromittent organ ： ウィキペディア英語版 |
intromittent organ
An intromittent organ is a general term for an external organ of a male organism that is specialized to deliver sperm during copulation. Intromittent organs are found most often in terrestrial species, as most aquatic species fertilize their eggs externally, although there are exceptions. For many species in the animal kingdom, the male intromittent organ is a hallmark characteristic of internal fertilization.
==Species with intromittent organs==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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