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During maturation, the penis grows until it can extend out of the mantle cavity. [4] The spermatophores of H. heteropsis have short sperm masses and are stored in a looped Needham's sac. [7] Female H. heteropsis squids have a singular ovary where the oocytes are developed. [9]
Some male squids, mainly deep-water species, have instead evolved a penis longer than their own body length, the longest penis in any free-living animals. It is assumed these males simply attach a spermatophore anywhere on a female's body. [115] An indication of sexual maturity of females is the development of brachial photophores to attract mates.
Penis elongation has been observed in this species; when erect, the penis may be as long as the mantle, head and arms combined. [5] [6] As such, deep water squid like M. ingens have the greatest known penis length relative to body size of all mobile animals, second in the entire animal kingdom only to certain sessile barnacles. [5]
Depending on the species, the male may use it merely as a conduit to the female, analogously to a penis in other animals, or he may wrench it off and present it to the female. The hectocotyl arm was first described in Aristotle's biological works. Although Aristotle knew of its use in mating, he was doubtful that a tentacle could deliver sperm.
The squid digs hooks in one of its arms into a predator and jets away, leaving the arm in the predator's skin. [3] The male O. deletron has a penis, which is unusual among squids. Males find it difficult to detect the sex of other individuals they encounter in the dark depths, so they have adopted a strategy of attaching sperm packets to all ...
Extreme penis elongation has been observed in the deep water squid Onykia ingens. When erect, the penis may be as long as the mantle, head, and arms combined. [181] As such, deep water squids have the greatest known penis length relative to body size of all mobile animals, second in the entire animal kingdom only to certain sessile barnacles. [182]
Gladius, showing measurement of rachis and vane. The gladius (pl.: gladii), or pen, is a hard internal bodypart found in many cephalopods of the superorder Decapodiformes (particularly squids) and in a single extant member of the Octopodiformes, the vampire squid (Vampyroteuthis infernalis). [1]
Adult squid in the Pterygioteuthis genera lack hooks on their tentacular clubs, but do have some hooks on the arms. Male squid have a specialized arm used to transfer sperm to females called hectocotyli. Females do not have suckers on their ventral arms and only have one oviduct developed. [4]