The modified arm of male cephalopods (squid, octopus) that is used for transferring sperm to females during reproduction.
From Greek 'hectós' (hundred) and 'kotyle' (cup/sucker), referencing the numerous suckers on this specialized reproductive arm.
The hectocotyl is nature's weirdest delivery system—some male octopuses literally detach this arm and leave it with the female, like a biological love letter!
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