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".[1]

Anatomy of Phalangium cornutum. d, Sheath of penis. e, penis. f, glans.

This denomination refers to a superficial similarity (analogy) with vertebrate penises and does not have any phylogenetic relationship with it.

References

Ricardo Pinto-da-Rocha, Glauco Machado, Gonzalo Giribet (eds). (2006). "Morphology and Functional Anatomy". Harvestmen: the Biology of Opiliones. Cambridge, MA: Harvard University Press. pp. 59–60. ISBN 0674023439.CS1 maint: uses authors parameter (link)

External links

Opiliones reproductive anatomy- Dr. Jefferey Schultz, University of Maryland
Harvestman Spider penis, Thelbunus mirabilus - Australian Museum

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[1] Ricardo Pinto-da-Rocha, Glauco Machado, Gonzalo Giribet (eds). (2006). "Morphology and Functional Anatomy". Harvestmen: the Biology of Opiliones. Cambridge, MA: Harvard University Press. pp. 59–60. ISBN 0674023439.CS1 maint: uses authors parameter (link)