Researchers have identified a unique mollusk, described as a “mystery sea slug,” in the ocean’s midnight zone. Known as *Bathydevius caudactylus*, this nudibranch, or sea slug, is the first of its kind discovered in such deep waters. It stands out with a glowing, apple-sized body, a paddle-like tail, and a large, gelatinous hood. Nudibranchs are …

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