
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.
Figure from Cephalopods: A World Guide (amzn/b&n/abe/pwll), by Mark Norman.



