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Those are fantastic pictures, has she continued to use the same burrow or make a new one each time? How are you sexing them, was Fontanelle male or just a smaller octopus?
The paper that officially describes and names it says that the hectocotylus is much shorter (less than 1/3 the length of other arms) and I believe Thales said this was obvious in Fontanelle, so I'm assuming that's not the case in the new one.
The male dug as well - twice. Then stopped, just like it stopped the interesting displays. He did not however ever dig such a complete den. Sadly, she hasn't seemed interested in the den again, though it is still there. There are some bristleworms in it now, which may or may not have something to do with her using it. I fully expect her not to bother again.
When I get a chance, I'll post a side by side pic so you can see the third arm size difference for male and female.
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