The Scariest Monsters of the Deep Sea

We took the spook-tacular celebration to the depths of the ocean, where some of the craziest—and scariest—looking creatures lurk in the dark

Frilled Shark (Wikicommons)

Red Octopus (Stauroteuthis syrtensis)

Red Octopus
(Ocean Portal / David Shale)
This red octopus is eerily beautiful. Found in the deep Atlantic waters off the U.S. Coast, the eight arms of Stauroteuthis syrtensis are connected by webbing that it uses to swim. Rows of glowing bioluminescent suckers trail down its eight arms and glow in the deep-sea. Scientists think these glow-in-the-dark suckers may be used to attract planktonic prey like insects drawn to a light. The species has been recognized for at least 100 years, but it wasn't until 1999 that scientists realized it glowed.

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