Nudibranchs & Sea Slugs
Welcome to our stunning photo gallery, “Tropical Nudibranch”!
Whether you’re a marine enthusiast or simply appreciate the wonders of the ocean, this collection is a must-see. Get ready to be enchanted by the extraordinary beauty of Indo-Pacific nudibranchs!
The more pictures of these wonderful creatures you can find in the book Nudibranchs of the Coral Triangle
Donut Nudibranch
Name - Donut Nudibranch, Indonesia, PNG, 15 mm.
Nudibranch identification: body with a brown midlateral stripe mimicking the branch of hydroid it feeds on. Cerata with grey and orange rings.
Spanish Dancer Nudibranch
Spanish Dancer Nudibranch, Indo-Pacific, 600 mm. Capable of swimming by body flexions and mantle undulations. Nudibranch identification: six separate gill branches that can not retract into a gill pouch.
Red Spot Nudibranch
Name - Red Spot Nudibranch, Western Pacific, 55 mm.
Nudibranch identification: yellow marginal band, red spots.
Paperbubble Sea Slug
Sea slug name - Paperbubble Sea Slug. Circumtropical, 60 mm. Sea slug identification: red with bluish edges, striated shell.
Barbara’s Sea Slug
Sea slug name - Barbara’s Sea Slug. Western Central Paific, 30 mm. Sea slug identification: yellow-orange and green marginal bands.
Blotched Nudibranch
Nudibranch name - Blotched Nudibranch, Western Pacific, 30 mm. Nudibranch identification: yellow spots on mantle margin, gills red with white dots.
Leaf Sheep Sea Slug
Name - Leaf Sheep Sea Slug, Indo-West Pacific, 7 mm. Found green alga. Variable coloration. Nudibranch identification: sandglass-shaped brownish patch behind the eyes, dark-tipped rhinophores.
Pink Nudibranch
Name - Pink Nudibranch Indonesia, Philippines, 12 mm. Nudibranch identification: pink cerata with inflated white apices.
Desirable Nudibranch
Name - Desirable Nudibranch, Indo-Pacific, 20 mm. Nudibranch identification: papillate orange rhinophores, white-tipped
Psychodelic Nudibranch
Nudibranch name - Psychodelic Nudibranch
Western Pacific, 50 mm.
Nudibranch identification: transparent, with white lines. Cerata mimics Xenia soft corals it lives on.
Ringed Nudibranch
Name - Ringed Nudibranch Indonesia, 20 mm. Nudibranch identification: oral tentacles and rhinophores reddish, cerata with a bigger blue and smaller yellow ring and a whitish apex.
Three-Teeth Sea Butterfly
Name - Three-Teeth Sea Butterfly Pelagic opistobranch, swimming, feeding on phytoplankton. Cosmopolitan, 20 mm. Nudibranch identification : transparent, posterior shell w/three spines.
Dark-Margined Nudibranch
Name - Dark-Margined Nudibranch Indo-Pacific, 100 mm. Nudibranch identification: black marginal line.
Brown-Stripe Nudibranch
Name - Brown-Stripe Nudibranch Indonesia, 17 mm. Nudibranch identification: white with brown lines. Translucent cerata with white apical parts.
Zebra Sea Slug
Name - Zebra Sea Slug, Indo-Pacific, 5 mm. Bivalve gastropods, their shell consists of two separate pieces. Nudibranch identification: body with white and reddish spots, shell with bands.
Dark Butterfly Sea Slug
Sea slug name - Dark Butterfly Slug, Western Pacific, 15 mm.
Sea slug identofocation: yellow-orange with black lines and opaque white pigment. Cerata with concentric yellow lines and yellow spots.
Great Nudibranch
Name - Great Nudibranch, Indo-Pacific, 150 mm. Feeds on leather corals. Nudibranch identification: flattened brownish or bluish to purple cerata with curved tips. Blue tint is noticeable even on brownish specimens.
Brilliant Nudibranch
Name - Brilliant Nudibranch, Western Pacific, 100 mm. Nudibranch identification: translucent white, curved cerata with visible pinkish-yellow digestive glands, feeds on octocorals.
Japanese Nudibranch
Name - Japanese Nudibranch, Indo-Pacific, 20 mm. Feeds on eggs of other sea slugs, color of the cerata changes as the color of food changes. Nudibranch identification:: white markings on the notum, rhinophores with 2-3 swellings.
Brown-Margin Nudibranch
Nudibranch name - Brown-Margin Nudibranch, Indo-Pacific, 40 mm. Nudibranch identification: brown with brown marginal band.
Kikutaro’s Butterfly Sea Slug
Name - Kikutaro’s Butterfly Sea Slug, Western Pacific,
15 mm. Nudibranch identification: cerata with orange apex line.
Strawberry Nudibranch
Nudibranch name - Strawberry Nudibranch Indo-West Pacific, 100 mm. Like other Gymnodoris species, feeds on opistobranchs. NUdibranch identification: red with large yellow pustule. Left photo: feeding on Marionia arborescens.
Pumpkin Nudibranch
Name - Pumpkin Nudibranch, Indo-West Pacific, 60
mm. Nudibranch identification: grainy yellow mantle.
Chamberlan's Nudibranch
Name - Chamberlan's Nudibranch, Indo-Pacific, 60 mm. Nudibranch identification: white or pale-bluish with dark patches, rhinophores and gills red.
Pink-Face Nudibranch
Pink-Face Nudibranch, Japan, China, Philippines, 50 mm. Nudibranch identification: pink mantle and oral veil.
Green Sea Slug
Name - Green Sea Slug, Indo-Pacific, 20 mm. Feeds on green alga Caulerpa. Sea slug identification: thin blue lines on the shell.
Green Sea Slug
Name - Green Sea Slug, Indo-Pacific, 20 mm. Feeds on
green alga Caulerpa. Nudbranch identification: thin blue lines on the shell.
Yellow Umbrella Sea Slug
Name - Yellow Umbrella Sea Slug, Philippines, 20 mm. Sea slug identification: gills under the shell.
Ornate Nudibranch
Name - Ornate Nudibranch, Indo-West Pacific, 80 mm. Nudibrhanch identification: notum with pink-tipped tubercles.
Knobby Nudibranch
Nudibranch name - Knobby Nudibranch Indo-Pacific, 40 mm.
Nudibranch identification: margin w/blue and yellow spots, large conical tubercles.
Magnificent Nudibranch
Nudibranch name - Magnificent Nudibranch Indo-Pacifica, 70 mm. Nudibranch identification: central ridge with 3 bright-red elevations, rhinophores and gills red.
Adam's Nudibranch
Nudibranch name - Adam's Nudibranch Indonesia, Malaysia, Thailand, 50 mm. Nudibranch identification: opaque white with red marking.
Golden Nudibranch
Nudibranch name - Golden Nudibranch, Western Pacific, 50 mm. Nudibranch identification: border lines: outermost bluish, dark blue, bold yellow.