Nanuca smaugi is a species of sea slug, specifically an aeolid nudibranch. It is a marine gastropod mollusc in the family Myrrhinidae, and is endemic to Brazil.
Etymology Nanuca smaugi was named after Smaug, the dragon from The Hobbit. The name alludes to the dragon's red and gold wings, which are reminiscent of the species' dragon-like body shape and its vivid orange coloration.
Distribution This species is known from the Cabo Frio region in southeastern Brazil, at 3–15 m depths.
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