Vulcanoctopus hydrothermalis male (top), Benthoctopus female (bottom)
Figure from Cephalopods: A World Guide (amzn/b&n/abe/pwll), by Mark Norman.
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Sepia pharaonis, male on the left, female on the right
Figure from Cephalopods: A World Guide (amzn/b&n/abe/pwll), by Mark Norman.
Octopus cyanea
You may be wondering what they're doing. Here's a hint: that's a male below, and a female above. Here's another hint: that's his specialized third arm, the hectocotyl limb. Third hint: it's in her oviduct.
If you can't figure it out yet, look below the fold for an illustration.…
Euprymna tasmanica mating pair (male on the left)
Figure from Cephalopods: A World Guide (amzn/b&n/abe/pwll), by Mark Norman.
Octopus kaurna(That's one female at the center of a mass of males)
Figure from Cephalopods: A World Guide (amzn/b&n/abe/pwll), by Mark Norman.