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Opiliones penis : ウィキペディア英語版 | Opiliones penis
The penis of the Opiliones (harvestmen) is an intromittent organ that is not present in other arachnids. It consists of a long shaft (the truncus) and a terminal capsule called a glans, containing a stylus and ejaculatory duct. It may have from one to three muscles, or none as in the specialized lineage Grassatores, where the penis is operated by haemolymph pressure. In some members of the Cyphophthalmi, the structure has been termed a "spermatopositor". This denomination refers to a superficial similarity (analogy) with vertebrate penises and does not have any phylogenetic relationship with it. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Opiliones penis」の詳細全文を読む
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