Phestilla melanobrachia

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Phestilla melanobrachia is a species of sea slug, an aeolid nudibranch in the family Trinchesiidae. It comes in two color forms, black and orange, but both forms are genetically identical. It feeds on corals in the family Dendrophylliidae. The species was first described from the Philippines and has been found in Hong Kong, Japan, Malaysia, and from East Asia to Australia.