Opisthobranch Collection

Nudibranch (Gymnodoris aurita). Nudibranchs are shell-less marine molluscs that live in seas around the world. Here the external gills (top) can be seen which give the nudibranch its name

Nudibranchs mating
Nudibranchs (Flabellina verrucosa) mating. Nudibranchs are shell-less marine molluscs that live in seas around the world. They have external gills that give the nudibranch its name

An Aeolid nudibranch on an orange sponge, Papua New Guinea
An Aeolid nudibranch (Caloria indica) on an orange sponge, Fathers reef, Kimbe Bay, Papua New Guinea

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Snail eating eggs - Bulakan Slope dive site, Seraya, Karangasem, Bali, Indonesia, Indian Ocean Snail eating eggs - Bulakan Slope dive site, Seraya, Karangasem, Bali, Indonesia, Indian Ocean

Sea Butterfly floating in water column - Blackwater night dive, Seraya, Karangasem, Bali, Indonesia, Indian Ocean Sea Butterfly floating in water column - Blackwater night dive, Seraya, Karangasem

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Sea Butterfly swimming in water column - Blackwater night dive, Seraya, Karangasem, Bali, Indonesia, Indian Ocean Sea Butterfly swimming in water column - Blackwater night dive, Seraya, Karangasem

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Sea Butterfly floating in water column - Blackwater night dive, Seraya, Karangasem, Bali, Indonesia, Indian Ocean Date: 14-Aug-20

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Sea Angel floating in water column - Blackwater night dive, Seraya, Karangasem, Bali, Indonesia, Indian Ocean Sea Angel floating in water column - Blackwater night dive, Seraya, Karangasem, Bali

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Sea Angel floating in water column - Blackwater night dive, Seraya, Karangasem, Bali, Indonesia, Indian Ocean Sea Angel floating in water column - Blackwater night dive, Seraya, Karangasem, Bali

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Reticulated Nudibranch - Keruo Channel dive site, Penemu Island, Dampier Strait, Raja Ampat, Indonesia

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Co's Chromodoris Nudibranch - Dropoff dive site, Tulamben, Kubu district, Karangasem, Bali, Indonesia, Indian Ocean Date: 08-Nov-19

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Orange-barred Mexichromis Nudibranch - Batu Niti dive site, Seraya, Kubu district, Karangasem, Bali, Indonesia, Indian Ocean Date: 24-Mar-16

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Long-cirri Phyllodesmium Nudibranch with cerata - with digestive gland ducts connected to zooxanthellae - Muka Linggua dive site, Bangka Island, north Sulawesi, Indonesia

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Magnificent Chromodoris Nudibranch - Sanggamau dive site, Bangka Island, north Sulawesi, Indonesia, Pacific Ocean Date: 24-03-2016

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Dusky Nembrotha Nudibranch raising itself to smell environment - Tampa Fufu dive site, Bangka Island, north Sulawesi, Indonesia, Pacific Ocean Date: 24-03-2016

A magnificent ceratosoma nudibranch on coral, Solomons
A magnificent ceratosoma (Ceratosoma magnificum) nudibranch on coral, Russell Islands, Solomons

Rainbow Parrotfish swimming in the Carribean Sea

A black-margined glossodoris nudibranch
A black-margined glossodoris (Glossodoris atromarginata) amongst coral at a depth of 12 metres, Florida Islands, Solomons

Chromodoris coi sea slug nudibranch, Pulau Tioman, Pahang, Malaysia

Nudibranch with orange emperor shrimp, Bali, Indonesia
Mexichromis multitubeculata sea slug nudibranch with orange emperor shrimp, Bali, Indonesia

Brown and white discodoris nudibranch, Bali, Indonesia
Brown and white discodoris nudibranch next to orange sponge, Bali, Indonesia

A beautiful nudibranch crawls slowly across a reef
A beautiful nudibranch (Hypselodoris bullocki) crawls slowly across a reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life

Chromodoris Lochi nudibranch, Beqa Lagoon, Fiji

Hypselodoris bullockii nudibranch on coral, Solomon Islands
Bullocks hypselodoris (Hypselodoris bullockii) on coral, Solomon Islands

Phyllodesmium poindimiei nudibranch on red sponge, Indonesia

Nembrotha chamberlaini with feeding appendage extended
Chamberlains Nembrotha (Nembrotha chamberlaini) with feeding appendage extended, Lembeh Strait, North Sulawesi, Indonesia

Head on view of a Chromodoris reticulata nudibranch, Komodo National Park, Indonesia

A red-netted chromodori, Komodo National Park, Indonesia
A red-netted chromodoris (Chromodoris tinctoria), head/side view showing cerata, Komodo National Park, Indonesia

Close-up view of a Risbecia tryoni nudibranch
A Risbecia tryoni nudibranch with white, brown and bright blue markings, Komodo National Park, Indonesia

A colorful nudibranch crawls slowly across a reef
A colorful nudibranch (Nembrotha kubaryana) crawls slowly across a reef near the island of Sulawesi, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life

A yellow nudibranch crawling away from its mass egg ribbon, Papua New Guinea
A Banana Nudibranch (Notodoris minor) crawling away from its mass egg ribbon implanted on the side of an outcropping on the reef in the warm clear ocean waters of Papua New Guinea

Emperor commensal shrimp on a nudibranch, North Sulawesi
Emperor commensal shrimp (Periclimenes imperator) riding on a Ceratosoma gracillimum T-bar nudibranch, Lembeh Strait, North Sulawesi, Indonesia

Lochs chromodoris nudibranch amongst coral. Solomons
Lochs chromodoris (Chromodoris lochi) amongst coral, depth 12 metres, Florida Islands, Solomons

An opisthobranch on volcanic sand, Papua New Guinea
A blue and white opisthobranch on volcanic sand, Papua New Guinea

Blue hypselodoris bulockii sea slug nudibranch, Lembeh Strait, Bitung, North Sulawesi, Indonesia

Head on view showing cerata on an aeolid nudibranch, Pteraeolidia ianthina, in Komodo National Park, Indonesia

A pair of Nembrotha chamberlaini nudibranchs mating, Komodo National Park, Indonesia

Nudibranch, Fiji

Cluster of Hypselodoris maridadilus sea slugs

Flabellina exoptata nudibranch, Pulau Tioman, Pahang, Malaysia
Flabellina exoptata sea slug nudibranch, Pulau Tioman, Pahang, Malaysia

Ruffled nudibranch on coral, Solomons
Nudibranch (Glossodoris hikuerensis) on coral at a depth of 10 metres, Florida Islands, Solomons

A pair of Mexichromis nudibranch circle each other trying to mate
A pair of nudibranchs (Mexichromis sp.) circle each other trying to mate in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity

A flabellina nudibranch amongst coral
A flabellina nudibranch (Flabellina exoptata) amongst coral at a depth of 10 metres, Florida Islands, Solomons

Glossodoris atromarginata nudibranch, Bali, Indonesia
Yellow white and black Glossodoris atromarginata nudibranch sea slug, Bali, Indonesia

Chromodoris coi nudibranch sea slug, Bali, Indonesia

A purple Hypselodoris apolegma nudibranch with large cerata
A bright purple Hypselodoris apolegma nudibranch with very large cerata, Komodo National Park, Indonesia

Pair of nudibranch sea slugs, Bali, Indonesia
Pair of Mexichromis multituberculata and a hypselodoris nigrostriata nudibranch sea slug, Bali, Indonesia

Halgerda batangas nudibranch, North Sulawesi, Indonesia
Halgerda batangas sea slug nudibranch, Lembeh Strait, Bitung, North Sulawesi, Indonesia

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"Opisthobranchs: The Colorful World of Nudibranchs Mating" Witness the mesmerizing dance of opisthobranchs, commonly known as nudibranchs, as they engage in their intricate mating rituals. These fascinating creatures, found in various oceans around the world, display a stunning array of vibrant colors and patterns. In Papua New Guinea's waters, an Aeolid nudibranch gracefully perches on an orange sponge. Its delicate body adorned with striking hues creates a breathtaking sight that showcases nature's artistic prowess. Venturing into the depths of Bali's Seraya during a blackwater night dive reveals another enchanting spectacle - sea butterflies floating effortlessly in the water column. These ethereal beings resemble miniature angels with translucent wings fluttering gently amidst the darkness. Their presence adds an otherworldly charm to this underwater realm. As we explore further into Indonesia's Indian Ocean, more opisthobranch wonders await us. In UW INDO 2030 42 and UW INDO 2030 44, these marine marvels captivate with their intricate patterns and textures that seem like works of art painted by Mother Nature herself. UW INDO 2026 67 and UW INDO 2026 28 showcase yet another aspect diversity - their ability to adapt to different environments. From rocky surfaces to sandy bottoms, these resilient creatures thrive wherever they call home. Traveling back through time to UW INDO 1973 07 and even further to UW INDO1908 O5 reminds us that opisthobranchs have been gracing our oceans for centuries. Their existence is a testament to evolution's brilliance and serves as a reminder of our responsibility towards preserving these fragile ecosystems. So let us immerse ourselves in the captivating world of opisthobranchs – where beauty meets biology, and every encounter with these enchanting creatures leaves us in awe.