How do you tell a boy octopus from a girl octopus?

Oct 25, 2003
My son, John, age 9, is doing a research project on the octopus :grad:, and is having a difficult time coming up with a comprehensible description of how to tell a boy from a girl. Can anyone help him out?
With profound thanks from Maine,
John's mother
Hi John's mum (?Lindsay is it). How much time have you got? If the project can wait two days then I can get back in to work and respond with a couple of photographs of boy/girl characters. Basically the tip of the third right arm (or, rarely third left) of the male octopus is modified into a scoop/shovel (calamus/ligula) - there are no suckers at the end (the female has all 8 arms attenuating to fine, sucker-bearing tips.

There is a section online already that might help ('A guide to frequently used characters, states and measures') that has illustrations of this scoop/shovel (hectocotylus). Please see Figure 4 at Octopus and Squid Measures, Indices and Counts

I'll post additional pics of whole animals in 2 days

Shop Amazon

Shop Amazon
Shop Amazon; support TONMO!
Shop Amazon
We are a participant in the Amazon Services LLC Associates Program, an affiliate program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.