This subject contains information from the Expanded Cthulhu Mythos, and not based on H.P. Lovecraft's works directly. They are the twin daughters of Cthulhu, hence they are called the Twin spawn of Cthulhu. They are currently imprisoned in the Great Red Spot of the planet Jupiter. They both appear as huge shell-endowed beings, with eight segmented limbs, and six long arms ending with claws, vaguely resembling their half-sister, Cthylla.

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