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how big does O Hummelincki get?

Sep 8, 2006
www.cephbase.org still lists them as Octopus filosus, and according to cephbase "body to 7cm, arms to 30cm"

That's about 2.5 inch mantle and 12 inch arms. That must be arm tip to arm tip, as the ones we have kept have all had relatively short legs.