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  • A tiny nudibranch, Tenellia sibogae, feeding on a hydroid. The hydroid's stinging cells pass unharmed through the digestive tract, eventually ending up at the colorful tips of the nudibranch's cerrata, where they are used for  defense!  Richelieu Rock, Thailand, Andaman Sea
    nb100-3.tif
  • Horned Aeolid Nudibranch, Hermissenda crassicornis, Santa Barbara Island, California, Pacific Ocean
    20150820_conception_0213.tif
  • Hopkin's Rose Nudibranch, Hopkinsia rosacea, Catalina Island, Channel Islands, California, Pacific Ocean
    20150817_conception-70.tif
  • This beautiful nudibranch, Mexichromis porterae, stands out conspicously against its drab surroundings. Catalina Island, Channel Islands, California, Pacific Ocean
    20180829_Vision_0020.tif
  • This Golden Phestilla nudibranch, Phestilla melanobrachia, mimics the stinging tentacles of its prey, Orange Cup Coral, Tubastrea faulkneri. Richelieu Rock, Thailand, Andaman Sea
    nbbb1-2.tif
  • A colorful nudibranch, Chromodoris kuniei, makes its way across a forest of Halimeda algae. Wakatobi Marine Reserve, Tukang Besi Archipelago, Sulawesi, Indonesia, Banda Sea, Pacific Ocean
    nb201.tif
  • As if living on the dining car of a train, a pair of Imperial Shrimp, Periclimenes imperator, lean over the side of their host, a Risbecia tryoni nudibranch, to feed. Milne Bay, Papua New Guinea, Pacific Ocean
    movefeast5.tif
  • This delicate creature resembles a bunch of eggs cooked sunny-side up, prompting a common name of ?Fried Egg? Nudibranch, Chromodoris annulata. The ribbon-like structure is its egg mass, which the animal is depositing on a shallow limestone wall. Mergui Archipelago, Myanmar/Burma, Andaman Sea. filename: nb131
    nb131.tif
  • A tiny nudibranch, Nudibranch, Mexichromis pusilla, browses in a field of filamentous algae. Puerto Galera, Mindoro, Philippines
    20190624_Philippines_0032.tif
  • This slender nudibranch, commonly known as a Purple Dragon, Pteraeolidia ianthina, is thought to derive some of its nutrients from zooxanthellae, which photosynthesize while living within the nudibranch.  Similan Islands Marine National Park, Thailand, Andaman Sea
    nb39.tif
  • Bornella anguilla nudibranch, feeding on hydroids.  Mergui Archipelago, Myanmar, Andaman Sea
    nb388norm.tif
  • Nudibranch, Ardeadoris egretta, Kimbe Bay, Papua New Guinea, Pacific Ocean
    20191103_PNG_0822.tif
  • This colorful nudibranch, Hypselodoris bullockii, deposits an egg ribbon on the branch of a dead gorgonian. Similan Islands Marine National Park, Thailand, Andaman Sea; Indian Ocean. filename: nb134
    nb134.tif
  • This colorful nudibranch, Armina sp., feeds on sea pens. Dumaguete, Negros, Philippines, Pacific Ocean
    20190616_Philippines_0121.tif
  • An example of the considerable color variation within the same species of nudibranch, a pair of Chromodoris geometrica browse among encrusting sponges. Similan Islands Marine National Park, Thailand, Andaman Sea
    nb105norm.tif
  • A colorful nudibranch, Tambja olivaria, browses on a sponge-covered substrate. Malapascua Island, Visayan Sea, Philippines, Pacific Ocean
    20120619_philippines_0028.tif
  • Horned Aeolid Nudibranch, Hermissenda crassicornis, Santa Barbara Island, California, Pacific Ocean
    20150820_conception_0213.tif
  • Sporting a pattern reminiscent of a bunch of fried eggs, a nudibranch, Chromodoris annulata, browses amidst a colony of encrusting sponge.   Mergui Archipelago, Myanmar, Andaman Sea
    nb501_D800.tif
  • This colorful nudibranch, Nembrotha kubaryana, is feeding on a colony of tunicates. Malaysia, South China Sea, Pacific Ocean
    nb321LM-2.tif
  • A colorful Nudibranch, Robastra luteolineata, glides across encrusting sponge. Similan Islands Marine National Park, Andaman Sea, Thailand
    nb20norm.tif
  • Marisla's Chromodorid nudibranch, Chromodoris marislae, Bahia De Los Angeles, Sea of Cortez, Mexico
    20190804_SeaOfCortez-627.tif
  • This colorful nudibranch, Trinchesia sp. or Tenellia sp., is normally found feeding on hydroids.  Dumaguete, Negros, Philippines, Pacific Ocean
    20190620_Philippines_0188.tif
  • This beautiful nudibranch, Mexichromis porterae, stands out conspicously against its drab surroundings. Catalina Island, Channel Islands, California, Pacific Ocean
    20180829_Vision_0020.tif
  • Nudibranch, Pteraeolidia ianthina, sometimes known as Purple Dragon, crawling on a tunicate. Thought to benefit from photosynthsizing symbiotic algae living within its tissues. Raja Ampat Islands, West Papua, Indonesia, Pacific Ocean
    nb376.tif
  • This large, colorful nudibranch, Chromodoris sp., is host to  pair of Imperial Shrimp, Periclimenes imperator. Mergui Archipelago, Myanmar/Burma, Andaman Sea
    nb235.tif
  • This colorful nudibranch, Nembrotha purpureolineata, is feeding on a tunicate. Komodo National Park, Flores Sea, Indonesia
    nb214-2.tif
  • This distinctive nudibranch, Thecacera pacifica, is relatively uncommon but widely distributed, ranging from Africa and the Red Sea to Hawaii. Pulau Sangeang, Nusa Tenggara, Indonesia, Pacific Ocean
    nb210LM-2.tif
  • A colorful nudibranch, Nembrotha kubaryana, stands tall, probably sampling scent trails to locate prey or a mate. Komodo National Park, Indonesia, Pacific Ocean
    nb501norm-2.tif
  • A colorful nudibranch, Chromodoris geminus, deposits eggs on rocky substrate. Mergui Archipelago, Myanmar, Andaman Sea
    nb373norm-2.tif
  • A pair of nudibranchs, Halgerda willeyi, appear to be snuggling.  Mergui Archipelago, Myanmar, Andaman Sea
    nb64norm-2.tif
  • Nudibranch, Aegires serenae, Cenderawasih Bay, West Papua, Indonesia
    20130812_cenderawasih_0131.tif
  • An imperial shrimp, Periclimenes imperator, receives free transportation and shelter thanks to a commensal relationship with its host nudibranch, Ceratosoma tenue. Lembeh Strait, North Sulawesi, Indonesia, Pacific Ocean
    2007MAY11nb163LM.tif
  • A colorful nudibranch, Chromodoris geminus, makes its way across the black sand bottom at Barren Island, Andaman Islands, Andaman Sea, India, Indian Ocean
    16FEB07nb016LM.tif
  • This nudibranch, Phyllidia ocellata, occurs in a wide variety of coloration and markings. Similan Islands Marine National Park, Thailand, Andaman Sea
    nb406norm.tif
  • Nudibranch, Chomodoris kuniei, flapping its mantle, possibly as a defense tactic. Anilao, Philippines, Pacific Ocean
    20110116_Philippines_0185.tif
  • A large, colorful nudibranch, Chromodoris sp., glides over the sea floor. Mergui Archipelago, Myanmar/Burma, Andaman Sea
    nb298.tif
  • This colorful nudibranch, Reticulidia suzanneae, was discovered in the Andaman Sea and recently described scientifically.  Similan Islands, Andaman Sea, Thailand
    nb236-2.tif
  • A colorful nudibranch, Tenellia sp., glides across a twig of Halameda algae. Raja Ampat, West Papua, Indonesia
    20181217_RajaAmpat_0151.tif
  • This striking nudibranch is commonly known as a Spanish Shawl, Flabellina iodinea.  Santa Cruz Island, Channel Islands, California, Pacific Ocean
    20180830_Vision_0002.tif
  • Nudibranch, Jorunna funebris, laying eggs.  Thailand, Andaman Sea
    nb481RF.tif
  • This unusual Rabbit-Ear nudibranch, Thecacera sp., was formerly known only from the Maldives, but has recently been found in Myanmar and Thailand. Mergui Archipelago, Myanmar, Andaman Sea
    nb418.tif
  • This elegant nudibranch, Caloria indica, is relatively common in the Andaman Sea. Similan Islands Marine National Park, Thailand, Andaman Sea; Indian Ocean
    nb234LM.tif
  • Nudibranch, Dermatobranchus ornatus,  Similan Islands Marine National Park, Thailand, Andaman Sea
    nb21.tif
  • A colorful nudibranch, Gymnodoris aurita, traverses the sand bottom at Rinca Island, Komodo Marine National Park, Indonesia, Indian Ocean
    20170730_Komodo_0081.tif
  • A tiny nudibranch, Cuthona sibogae, feeding on stinging hydroids. Namena Marine Reserve, Blight Water, Fiji, Pacific Ocean
    20121019_fiji_0164.tif
  • An imperial shrimp, Periclimenes imperator, receives free transportation and shelter thanks to a commensal relationship with its host nudibranch, Ceratosoma tenue. Lembeh Strait, North Sulawesi, Indonesia, Pacific Ocean
    2007MAY14nb55LM.tif
  • A gaudy looking nudibranch, Gymnodoris rubropapulosa, makes its way across a field of filamentous algae. Similan Islands Marine National Park, Thailand, Andaman Sea
    nb316.tif
  • This colorful nudibranch, Halgerda bacalusia, was discovered by the photographer on the same dive as his namesake, H. stricklandi. Andaman Sea
    nb315CPix.tif
  • A colorful nudibranch, Hypselodoris apolegma, perches on a narrow ledge. Lembeh Strait, North Sulawesi, Indonesia, Celebes Sea, Pacific Ocean
    nb341LM-2.tif
  • Nudibranch, Phyllidia ocellata. This species occurs in many color variations.  Ko Tao, Gulf of Thailand, Thailand
    nb322norm.tif
  • Baumann's Chromodorid nudibranch, Glossodoris baumanni, Midriff Islands, Sea of Cortez, Mexico
    20190804_SeaOfCortez-616.tif
  • These esquisitely colored nudibranchs, Hypselodoris bullockii, are browsing at the deep edge of a sloping drop-off. Similan Islands Marine National Park, Thailand, Andaman Sea. filename: nb135
    nb135.tif
  • A flamboyantly colored nudibranch, Hypselodoris kanga, feeds on a sponge. Lembeh Strait, North Sulawesi, Indonesia
    11MAY07nb40CP.tif
  • This distinctive nudibranch, Dermatobranchus ornatus, is feeding on gorgonian coral. Phang Nga Bay, Phuket, Thailand, Andaman Sea. filename: nb198
    nb198.tif
  • A colorful juvenile nudibranch, Chromodoris hamiltoni, browses on rocky substrate. Andaman Islands, India, Andaman Sea
    20120304_Andamans_0104.tif
  • This colorful nudibranch, Nembrotha kubaryana, is feeding on a colony of tunicates. Malaysia, South China Sea, Pacific Ocean
    nb321.tif
  • A pair of colorful nudibranchs, Chromdoris kuniei, feeding on sponge. West Papua, Indonesia, Pacific Ocean
    20130812_cenderawasih_0107.tif
  • This colorful nudibranch, Halgerda stricklandi, was scientifically described in 1999. Mergui Archipelago, Burma, Andaman Sea
    nb317.tif
  • A colorful nudibranch, Nembrotha purpureolineata, feeding on a cluster of tunicates. Komodo National Park, Banda Sea, Pacific Ocean
    20101019_Indo_0002-2.tif
  • A colorful nudibranch, Ceratosoma sp., browses a current=swept slope. Alor, Banda Sea, Indonesia, Pacific Ocean
    20101028_Indo_0072.tif
  • This attractive nudibranch, Chromodoris naiki, is rarely encountered in the Andaman Sea. Mergui Archipelago, Myanmar/Burma, Andaman Sea. filename: nb172
    nb172.tif
  • Close up of a Spanish Shawl Nudibranch, Flabellina iodinea, Santa Cruz Island, Channel Islands, California, USA, Pacific Ocean
    061102nb83CP.tif
  • These delicate looking nudibranchs, Tenellia sibogae, are mating, surrounded by the stinging hydroids on which they feed. Once ingested, the hydroids' stinging cells are actually kept as live captives by the nudibranchs, transferred to the tips of their colorful cerrata for their own self-defense! Richelieu Rock, Thailand, Andaman Sea
    nb102.tif
  • These colorful nudibranchs, Hypselodoris apolegma, are mating. Raja Ampat, West Papua, Indonesia
    20181215_RajaAmpat_0257.tif
  • A pair of Risbecia pulchella nudibranchs snuggle prior to mating. Surin Islands Marine National Park, Thailand, Andaman Sea
    nb50LM-2.tif
  • Although they differ in coloration, these two nudibranchs, Flabellina sp., are probably the same species. Similan Islands Marine National Park, Thailand, Andaman Sea. filename: nb11
    nb11.tif
  • This pair of Solar Eclipse nudibranchs, Chromodoris leopardus, appear to be snuggling affectionately. In reality, they are probably just sharing the same food source.  Similan Islands Marine National Park, Thailand, Andaman Sea
    nb40.tif
  • These exquisitely colored nudibranchs, Hypselodoris bullockii, are browsing on a sloping reef. Similan Islands Marine National Park, Thailand, Andaman Sea, Indian Ocean
    nb135-2.tif
  • These nudibranchs, Chromodoris annulata, are different color phases of the same species. Mergui Archipelago, Myanmar, Andaman Sea
    nb420norm.tif
  • A trio of nudibranchs, Phyllidia vericosa, snuggle in a rock surface covered with coralline algae. Richelieu Rock, Thailand, Andaman Sea
    nb46LM.tif
  • These attractive nudibranchs, Jorunna funebris, are copulating, surrounded by their favorite food, the blue sponge Haliclona sp.  Ko Tao, Thailand, Gulf of Thailand, South China Sea, Pacific Ocean
    nb250.tif
  • Susan's Flatworm, Pseudoceros susanae, looks similar to certain nudibranchs, but is distinguished by flat body and lack of rhinophores. Misool, Raja Ampat, Indonesia, Pacific Ocean
    2009APR16worm05LM.tif