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The egg sack of the Spanish dancer nudibranch (Hexabranchus sanguineus) is captured resting on a degraded reef surface, its delicate structure contrasting with the surrounding coral rubble. As nudibranchs rely on stable reef ecosystems for feeding and reproduction, the presence of egg ribbons can serve as an indicator of local ecological conditions. Filming these moments contributes to conservation-focused records of invertebrate reproduction in tropical marine environments. Location Andaman sea, Thailand.