Grimpoteuthis imperator, also known as the Emperor Dumbo octopus, is a species of deep-sea octopus in the family Grimpoteuthidae. The species is known from a single male specimen found in the Emperor Seamounts in the north Pacific off the coast of Japan in 2021. It was found at depths of 3900–4400m. The species was described using non-invasive methods such as CT scan and 3D imaging to preserve the only known specimen but to still be able to describe the species.

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