There's a 'spooky' sea creature found only in extreme deep sea conditions that, despite its name, is more closely related to octopi than squids. It features rows of fleshy spines in its inner black 'cloak.' What is the name of this creature?

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1. There's a 'spooky' sea creature found only in extreme deep sea conditions that, despite its name, is more closely related to octopi than squids. It features rows of fleshy spines in its inner black 'cloak.' What is the name of this creature?