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Pikachu Nudibranch

Ocean Aquaria

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Pikachu Nudibranch

Black velvet with yellow tips

Costasiella and Thecacera slugs like this one are the size of a grain of rice, which is why divers hunt them with magnifiers. Nicknamed the Pikachu nudibranch for its black body and yellow tips, it is proof that the reef keeps its best jokes very small.