Nine-limbed octopus gives aquarium a leg up - Mainichi Daily News

Looks like the 'extra' arm is a mutation growing about 1/5 of the way up Arm IVR. As Mori said, this could be the result of a regenration/healing site gone awry - I reported a specimen of Onykia (Onykia) robusta in my thesis that also looked like a tiny mutant arm was sprouting from a damaged sucker site (see below - scale bar = 10mm).
 

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