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An underwater close-up shows the egg ribbon of the Spanish dancer nudibranch (Hexabranchus sanguineus), laid in a distinctive ruffled spiral on a coral reef substrate. This egg mass represents an early and vulnerable life stage of a large dorid nudibranch, making it sensitive to sedimentation, physical disturbance, and declining reef health. Documenting reproductive events like this supports marine biodiversity monitoring and highlights the importance of protecting reef habitats where invertebrate life cycles begin. Location Andaman sea, Thailand.