Hectocotylus

A hectocotylus (plural: hectocotyli) is one of the arms of male cephalopods that is particular to store and move spermatophores to the female. Structurally, hectocotyli are solid hydrostats. Contingent upon the species, the male may utilize it only as a conductor to the female, or he may torque it off and present it to the female. 

The hectocotyl arm was first depicted in Aristotle's organic works. In spite of the fact that Aristotle knew about its utilization in mating, he was far fetched that a limb could convey sperm. The name hectocotylus was devis 

Hectocotyli are formed from multiple points of view, and shift significantly between species. The state of the tip of the hectocotylus has been greatly utilized in octopus systematics. 

Numerous coleoids need hectocotyli altogether.

Among Decapodiformes (ten-limbed cephalopods), for the most part it is possible that either of arms IV are hectocotylized. 

In incirrate octopuses it is one of arm pair III. Rare instances of twofold and two-sided hectocotylization have additionally been recorded in incirrate octopuses.

In male Seven-arm Octopuses (Haliphron atlanticus), the hectocotylus creates in a subtle sac before the correct eye that gives the male the presence of having just seven arms. 

In argonauts, the male exchanges the spermatophores to the female by putting its hectocotylus into a depression in the mantle of the female, called the pallial cavity. This is the main contact the male and female have with one another during sexual intercourse, and it tends to be a ways off. During sex, the hectocotylus severs from the male. The pipe mantle locking contraption on the hectocotylus keeps it held up in the pallial hole of the female.