hectocotylus

American  

[hek-tuh-kot-l-uhs] / ˌhɛk təˈkɒt l əs /

noun

Zoology.

PLURAL

hectocotyli

1. a modified arm of the male of certain cephalopods that is used to transfer sperm to the female.

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hectocotylus British  

/ ˌhɛktəʊˈkɒtɪləs /

noun

1. a tentacle in certain male cephalopod molluscs, such as the octopus, that is specialized for transferring spermatozoa to the female

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Etymology

Origin of hectocotylus

1850–55; < New Latin, equivalent to hecto- hecto- + -cotylus < Greek kotýlē cup

Example Sentences

One of the octopus’ eight limbs is a “hectocotylus,” we learn, which is used to “transfer sperm packets from the male to inside the cavity of the female.”

From The Verge

The hectocotylus, like many other genitals, is made of soft tissues which are unlikely to be fossilised.

From The Guardian

In each of these cases the male had the standard third right arm hectocotylus as well as an additional one somewhere else.

From Scientific American

Many species mate from afar—to avoid being eaten—with the male reaching his specialized hectocotylus arm into a female’s mantel cavity.

From Scientific American

The male still makes use of his hectocotylus arm, but in this case, he does it from an otherwise risky position right near the female’s mouth.

From Scientific American