Nudibranchs & Sea Slugs

Name - Green Sea Slug, Indo-Pacific, 20 mm. Feeds on green alga Caulerpa. Nudbranch identification: thin blue lines on the shell.

Name - Coleman's Nudibranch, Western Pacific, 25 mm. Nudibranch identification: yellow pigment between black lines.

Name - Ornate Nudibranch, Indo-West Pacific, 80 mm. Nudibrhanch identification: notum with pink-tipped tubercles.

Name - Ridged Nudibranch, Indo-Western Pacific, 40 mm. Nudibranch Identification: black rhinophores.

Name - Yellow Umbrella Sea Slug, Philippines, 20 mm. Sea slug identification: gills under the shell.

Sea slug name - Paperbubble Sea Slug. Circumtropical, 60 mm. Sea slug identification: red with bluish edges, striated shell.

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.

Name - Scarlet Nudibranch, Indonesia, 12 mm. Nudibranch identification: red-orange with several large lateral papillae.

Name - Desirable Nudibranch, Indo-Pacific, 20 mm. Nudibranch identification: papillate orange rhinophores, white-tipped

Name - Pale Nudibranch Indo-Pacific, 20 mm. Nudibranch identification: orange with numerous dark spots.

Name - Freckled Nudibranch, Circumtropical, 70 mm. Nudibranch identification: parapodial flaps with dark margin.

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.

Name - Brown-Stripe Nudibranch Indonesia, 17 mm. Nudibranch identification: white with brown lines. Translucent cerata with white apical parts.

Nudibranch name - Adam's Nudibranch Indonesia, Malaysia, Thailand, 50 mm. Nudibranch identification: opaque white with red marking.

Name - Salaamica Nudibranch, Indo-Pacific, 20 mm. Nudibranch identification:: translucent body, head and notum with white patches, cerata with white markings, white or orange subapically.

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.

Name - Red Spot Nudibranch, Western Pacific, 55 mm. Nudibranch identification: yellow marginal band, red spots.

Nudibranch name - Psychodelic Nudibranch Western Pacific, 50 mm. Nudibranch identification: transparent, with white lines. Cerata mimics Xenia soft corals it lives on.

Name - Wavy Nudibranch, Indonesia, Philippines, 20 mm. Nudibranch identification: white or brown with black-tipped appendages.

Sea slug name - Barbara’s Sea Slug. Western Central Paific, 30 mm. Sea slug identification: yellow-orange and green marginal bands.

Nudibranch name - Golden Nudibranch, Western Pacific, 50 mm. Nudibranch identification: border lines: outermost bluish, dark blue, bold yellow.

Name - Three-Teeth Sea Butterfly Pelagic opistobranch, swimming, feeding on phytoplankton. Cosmopolitan, 20 mm. Nudibranch identification : transparent, posterior shell w/three spines.

Name - Nippled Sea Slug, Indo-West Pacific, 500 mm

Name - Pink Nudibranch Indonesia, Philippines, 12 mm. Nudibranch identification: pink cerata with inflated white apices.

Name - Kikutaro’s Butterfly Sea Slug, Western Pacific, 15 mm. Nudibranch identification: cerata with orange apex line.

Name - White-Spotted Nudibranch, Indo-West Pacific 66 mm. Nudibranch identification: yellowish marginal band, white blotches.

Nudibranch name - Lumpy Nudibranch Indo-Pacific, 750 mm. Nudibranch identification: dark-brown with paler tubercles, white marginal band.

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.

Nudibranch name - Magnificent Nudibranch Indo-Pacifica, 70 mm. Nudibranch identification: central ridge with 3 bright-red elevations, rhinophores and gills red.

Name - Gutter Nudibranch, Western Central Pacific, 10 mm. Nudibranch identification: network of fine white lines, three pairs of lobes

Name - Green Sea Slug, Indo-Pacific, 20 mm. Feeds on green alga Caulerpa. Sea slug identification: thin blue lines on the shell.

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.

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.

Nudibranch name - Knobby Nudibranch Indo-Pacific, 40 mm. Nudibranch identification: margin w/blue and yellow spots, large conical tubercles.

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.

Nudibranch name - Blotched Nudibranch, Western Pacific, 30 mm. Nudibranch identification: yellow spots on mantle margin, gills red with white dots.

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.

Name - Lined Neon Sea Slug, Indo-Pacific, 40 mm. Nudibranch identification: white with dark-brown lines, rhinophores and gills bases with yellow and blue pigment.

Name - Dark-Margined Nudibranch Indo-Pacific, 100 mm. Nudibranch identification: black marginal line.

Pink-Face Nudibranch, Japan, China, Philippines, 50 mm. Nudibranch identification: pink mantle and oral veil.

Nudibranch name - Brown-Margin Nudibranch, Indo-Pacific, 40 mm. Nudibranch identification: brown with brown marginal band.

Name - Geographic Sea Hare Nudibranch, circumtropical, 100 mm. Nudibranch identification: closely set rhinophores, map-like pattern of dark-green lines and pale “islands”.

Name - Pumpkin Nudibranch, Indo-West Pacific, 60 mm. Nudibranch identification: grainy yellow mantle.

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.

Name - Chamberlan's Nudibranch, Indo-Pacific, 60 mm. Nudibranch identification: white or pale-bluish with dark patches, rhinophores and gills red.

Name - Brilliant Nudibranch, Western Pacific, 100 mm. Nudibranch identification: translucent white, curved cerata with visible pinkish-yellow digestive glands, feeds on octocorals.