Jeff Rotman / Symbiotic emperor shrimp (Periclimenes imperator / Zenopontonia rex) living in the gills of a spanish nudibranch (Hexabranchus sanguineus) Red Sea, Egypt
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Magnus Lundgren / Wild Wonders of China / Free swimming juvenile spanish dancer (Hexabranchus sanguineus) in the night, Kenting National Park, Hengchun Peninsula, Taiwan
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Magnus Lundgren / Wild Wonders of China / Free swimming juvenile spanish dancer (Hexabranchus sanguineus) in the night, Kenting National Park, Hengchun Peninsula, Taiwan
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David Fleetham / Imperial commensal shrimp (Periclimenes imperator / Zenopontonia rex) on Spanish dancer nudibranch (Hexabranchus sanguineus) at night. Philippines.
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Tony Wu / Spanish dancer nudibranch (Hexabranchus sanguineus) scavenging the reef at night in Ambon, Indonesia
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Pascal Kobeh / Diver in front of two mating Spanish dancers (Hexabranchus sanguineus) Madagascar. Indian Ocean. September 2012.
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Alex Mustard / Spanish dancer nudibranch (Hexabranchus sanguineus) moves across coral reef in daylight. It is unusually to see this large nudibranch during daylight. Nuweiba, Sinai, Egypt. Gulf of Aqaba, Red Sea.
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Joel Sartore / Photo Ark / Spanish dancer nudibranch (Hexabranchus sanguineus) with an Emperor shrimp (Zenopontonia rex) moving on top of it, Farglory Ocean Park, Hualien. Captive.
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David Fleetham / Spanish dancer nudibranch (Hexabranchus sanguineus) on coral reef at night, Hawaii, Pacific Ocean.
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David Fleetham / Spanish dancer nudibranch (Hexabranchus sanguineus) on a reef at night, portrait, Indonesia, Indo-Pacific Ocean.
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Magnus Lundgren / Wild Wonders of China / Free-swiiming juvenile Spanish dancer, (Hexabranchus sanguineus) Green Island, Taiwan.