Penis (Arachnida) 5135306 226158353 2008-07-17T02:18:20Z Nsk92 5119758 {{unreferenced}} tag added {{unreferenced|date=July 2008}} 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. {{arthropod-stub}} [[Category:Arthropod anatomy]]