Penis (Arachnida)
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The '''penis''' of the [[Arachnida]] is an intromitent organ, present exclusively in the order [[Opiliones]]. It consists of a long shaft, the [[truncus]], and a terminal capsule called [[glans]], containing the [[stylus]] and ejaculatory duct. It may have from one to three muscles, or none in the specialized lineage [[Grassatores]], where the penis is operated by [[haemolymph]] pressure.
This denomination refers to a superficial similarity ([[analogy]]) with [[vertebrate]] [[penis]]es and does not have any [[phylogenetic]] relationship with it.
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[[Category:Arthropod anatomy]]