Observation of penis elongation in Onykia ingens: implications for spermatophore transfer in deep-water squid.

The article reports a sighting of penis enlargement in a deep-water squid. The study involves a mature moribund male of the greater hooked squid which was count on the Patagonian slope south of the Falkland Islands. According to the authors, during the maturity assessment for which the mantle of the squid was opened, the penis of the squid suddenly started to erect. It notes that several spermatophores were ejaculated from the penis tip following the elongation.