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Nudibranch ウミウシ Appreciation Society @nudibranch.bsky.social · 14/09/2026

I'm so happy to hear that!! I'll make sure to find extra good species this year.

Nudibranch ウミウシ Appreciation Society @nudibranch.bsky.social · 11/09/2026

I'm starting to think about #Nudivember. I think I'm going to do it again this year so dig out your sketchbooks and art supplies!

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💧 Joybilance | Comms Closed! @joybilance.bsky.social · 27/08/2026

FOR: autismmimi A functional pirating outfit for mimi’s OC Circe, inspired by a species of Nudibranch! What they requested: vgen.co/joybilance_a... —- #vgencomm #skeb #outfitdesign

A full-body sketch of Circe Erebus, OC of autismmimi, in an outfit inspired by the Nembrotha Chamberlaini species of Nudibranch.

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Slumber🌠👁️ @thetownnarcoleptic.bsky.social · 29/08/2026

Stonecrop “jellybean” aeolid #Art #DigitalArt #DigitalArtist #Procreate #Nudibranch #Succulents #NatureArt

An aeolid sea slug with “jellybean” stonecrop succulent growths on its back instead of cerata. It’s sat on a cuboid-shaped plant pot with rounded corners. The top of the plant pot is turquoise, and the bottom is a dull brown.

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Phil Saunders @beardybirder.bsky.social · 01/09/2026

We enjoyed some fabulous rockpooling at Wembury Pt y'day, with 4 species of nudibranch encountered (courtesy of @jacob-wood.bsky.social & family), incl'g the tiny Favorinus branchialis; the sponge-like Doris berghi; the vibrantly hefty Gargamella (Discodoris) rosi; & the sublime Calma glaucoides.

A tiny Favorinus branchialis nudibranch faces right as it moves amongst white nudibranch eggs strewn across a brown mottled rock. The animal is covered in thickly-curved white tubercles, & it has obvious brown rhinophores.

A warty, beige-coloured, Doris berghi nudibranch faces the camera (with its stubby rhinophores visible towards the bottom on the image) as it rests on a brown and white rock.

A vibrantly blue & yellow-tubercled Calma glaucoides nudibranch moves towards the camera over a brown algal-covered rock.

A bright orange-red Gargamella (Discodoris) rosi nudibranch faces the camera, viewed briefly within a white plast tub, showing off its subtly white-ringed mantle and large red gill cluster.

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Stephanie Bilodeau, PhD @stephbilodeau.bsky.social · 03/09/2026

Coral bleaching is obviously bad for corals, but what about the things that eat corals? My second dissertation chapter is out now (Open Access, doi.org/10.3354/meps...) and asks how specialist coral-eating nudibranchs find the right corals, if they avoid bleached corals, and whether they should. 🧵

A fuzzy-looking adult nudibranch with a pale body and dark brown cerata crawls on a now-dead Porites rus coral fragment. The coral fragment is also occupied by several pale, rosette-shaped egg masses from the nudibranch.

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NullPointer 🍄 @nuiipointer.bsky.social · 05/09/2026

Most unusual find in the Dutch tide pools: this nudibranch, Doris sp. Found for us by marine biologist Rose Ommering from @goldcrestnt.bsky.social #nudibranchs #naturephotography

A bright yellow sea slug with round bumps on it. The bouquet on the right are the external gills. The two antennas on the left are sensory organs. Either Doris verrucosa or Doris ocelligera. Found in Zeeland, the Netherlands.

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Meg Mindlin @invertebabe.bsky.social · 06/09/2026

Meet a carnivorous sea slug, Melibe leonina or the lions mane nudibranch ✨🧪🐡 🐙 🦑 🧵

Light green graphic featuring an illustration of Melibe leonina, the lions mane nudibranch, with white sparkles surrounding it and text that reads “MEET A CARNIVOROUS SEA SLUG @invertebabe”. Beneath the text is pink and purple eel grass

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Carol Creech @ccreechstudio.bsky.social · 06/09/2026

SciArt September, Day 6: Coral. I thought of the sea and coral reefs and that led me to nudibranches. These are colorful, marine gastropods, and I knew I could find one in coral pinks. This is Verconia alboannulata. 🐡🎨 #sciart #coral #nudibranch #sciartseptember2026

3x4” Bristol paper with a pen illustration of a mud branch gastropod with wavy forms and a beautiful, bright coral pink with purple and white edges and markings.

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Emil @bergylta.bsky.social · 07/09/2026

For this #molluscmonday, we got the Violet sea slug (Edmundsella pedata). 🤿🦑 Taken: 2026-05-14 Camera: Olympus TG-5 #aquaticlife #edmundsellapedata #macrophotography #marinelife #nudibranch #nordicdiving #olympustg5 #scuba #swedishdiving #underwatermacrophotography

Photo of a tiny Violet seaslug (Edmundsella pedata) crawling up a piece of algae. It appears to crawl towards the viewer.

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muddsnapper @muddsnap.bsky.social · 07/09/2026

Frilly Nudibranch on the reef #nudibranch #marine #wildlife #photography muddsnapper.picfair.com

A mid-blue nudibranch (seas slug) with yellow dots and lines with a frilly edge crawls over the algae on a second world war shipwreck

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Saimi Hanma ⚔️ サイミ @saimihanma.northsky.social · 08/09/2026

Here are a few more of my most recent drawings for the Doodl prompts. I'm still managing to turn most of the prompts #invertebrate related, which is a fun side challenge each day. The prompt explanations are in the alt text.

a screenshot of a doodl with the prompt draw a magical pest. it's a night scene with a pentagram and candles and lunar eclipse with moths flying around. drawn in ink and marker

a screenshot of a doodl with the prompt draw your interpretation of head in teh clouds and an illustration of a hoverfly pollinating a cloudberry flower, drawn in ink

a doodl prompt of draw something mid-spill and an ink and marker illustration of a small glass jar spilling out various bugs

a doodl prompt that says draw a hidden design in something mundane and a nudibranch and the spots are actually tiny shellos pokemon, drawn in ink and marker

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Abi Stevens MCM Ldn R-12 @abistevensart.bsky.social · 09/09/2026

After all the stress I had getting these produced, doing this little photo is really helping me appreciate how pretty these pins turned out! 😭❤️❤️

An unedited macro shot of the gold and rainbow plated versions of my Nudibranch enamel pin design. It is a blue glaucus/blue angle nudibranch with stylised eyes at its fin points and on its head. The rainbow one is all shades of blue and the gold one has a mixture of blues and red.

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Neil Banas @neilbanas.bsky.social · 10/09/2026

(slightly) new #origami #nudibranch design. If you're in Glasgow, come by Doors Open Days at The Briggait for many more! waspsstudios.org.uk/open-studios... background: an Anna Atkins cyanotype, as seen recently in the @lrb.co.uk. (Algal cyanotypes are critical habitat for origami nudibranchs.)

A bluebrown nudibranch glides heavenward atop a bluewhite blade of seaweed. The nudibranch is origami designed and folded by Neil (origamiplankton.org) and the seaweed is a cyanotype by Anna Atkins, 1853.

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Jessica Goodheart @mollusksatamnh.bsky.social · 11/09/2026

The Goodheart Lab is seeking a full-time Postdoctoral Fellow on an NSF-funded project to study the process of kleptocnidy, the theft and storage of nematocysts, in nudibranch mollusks. Project link: www.nsf.gov/awardsearch/...). Application here: careers.amnh.org/postings/4908.

nsf.gov

Award Details - NSF Award Search

Find award details and explore award abstracts and publications.

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Bunni 🪷🐇✨ @immabunni.bsky.social · 22/05/2026

sea-bunny and jelly-bunnies 𑣲₍ ᐢ. .ᐢ₎ ‧₊˚ ⋅ ∘ ଳ˙○˚.

A ittle digital drawing of a small white sea shell with long leafy vines floating upward with a sea bunny nudibranch climbing on it. Two pink jellyfish with bunny ears float above with some bubbles.

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NeonSlushie 🔜 MAW @neonslushie.com · 21/05/2026

Anna's magnificent sea slug - Chromodoris annae #myart / #traditionalart / #animalart

A scan of a traditional art piece featuring a blue nudibranch. The sea slug is centered on a white rectangular sheet of paper, with a light blue rounded rectangle behind it. The sea slug has a blobby shape with no defined eyes, it looks very different from other slugs. Its head is marked by two rhinophores; orange protrusions that almost resemble bunny ears. Lower on its back is a feathery bunch of gills that somewhat resemble the tentacles of a sea anemone. The slug is primarily light blue, with bands of black, white, and yellow wrapping around its body.

This art piece was made with prismacolor markers and colored pencils on mixed media paper. 🎨 #myart #invertart

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Sarah Crumb @sarahscrumbs.bsky.social · 18/05/2026

Made it to low tide for a brief moment and found a beautiful nudibranch. 😍 #invertebrate #invert

A white nudibranch with hints of orange on its cerata.

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Nicole 🪲 @fossilforager.bsky.social · 21/05/2026

Sea slug plushie preorders end in 10 days!!! Get yours here: shop.fossilforager.art 💙

A photo of a small plush keychain of a nudibranch/sea slug. It is blue with a lighter blue stripe along the top of the body, and bright yellow stripes to the sides and on the “forehead”. It has a blue beaded keychain attachment and is photographed in my hand in front of a red Japanese maple tree.

A photo of a blue Nudibranch plushie photographed in my hand. It is dark blue with lighter blue “skirt” and stripe on top of the body. It has a bright yellow stripe wrapping around the sides of the body, and dark blue “ears” and “tail”. It is photographed in front of a Japanese maple tree.

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Robert Boessenecker, Dr. of Whaleontology ™️ @coastalpaleo.bsky.social · 26/05/2026

19. The only nudibranch in socal that's more absurdly colored than the California blue: MacFarland's chromodorid, Felimida macfarlandi. 🦑🦀

A light purple nudibranch with three golden yellow stripes and feathery rhinophores - it's climbing through brownish hairy algae.

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Azurine 🔞 Commissions open💚VGen💚read pinned @azurinecryptid.bsky.social · 28/03/2026

This was a design I made for a silkscreen printing class I'm taking. I decided to put it up on INPRNT cause I'm really happy with this particular design :) INPRNT: www.inprnt.com/gallery/idri... Tags: #inprnt #artprint #seaslugs #nudibranch #sacoglossan #seabunny #leafsheep #artsky #design

Digital black and white illustration of four different sea slugs. The sea slugs pictured are: the blue dragon sea slug, glaucus atlanticus. The leaf sheep sea slug, costasiella kuroshimae. The sea bunny, jorunna parva. And chromodoris williani.

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Nicole 🪲 @fossilforager.bsky.social · 28/03/2026

New iron-on patches for invertebrate lovers are now available! 🐛❤️ available here: shop.fossilforager.art Let me know in the comments which invertebrate or creature patches you’d like to see from me next! 🪳

A photo of 4 rectangular shaped embroidered iron-on patches featuring bright colors and different invertebrates + text. From top to bottom, there is a dark blue “Nudibranch Admirer” patch with sea slugs, a teal blue “I Love Jumping Spiders” patch with peacock jumping spiders, a light orange “Awed by Isopods” with different isopods, and light blue “#1 Bug Enthusiast” with true bugs.

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Niki Hubbard, PhD 🐙🦀 @nikihubbard.bsky.social · 26/03/2026

Sydney swell is hitting 7.7m later today, so I hope these little nudis are safely tucked aware somewhere sheltered and clinging on tight. 🦑🐙🌊

An image split into 3 panels. They show the same black and white nudibranch being swept side to side in a surge underwater. Each panel shows the nudibranch's rhinophores swept flat, to the right, then left, then right again, making it look like it is getting pushed around by the wind. The text on the image reads: it heckin WIMDY

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Nudibranch ウミウシ Appreciation Society @nudibranch.bsky.social · 24/03/2026

Thank you!! It's so much fun seeing it out in the wild!

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でんか @k-hermit.com · 24/03/2026

When I post a crab photo, people with crab icons like it. When I post squid, the squid people show up. And for sea slugs… the sea slug people. …am I underwater or something?

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Shane @sharkeee.bsky.social · 21/03/2026

A couple of super cool finds by a member of our monthly #rockpoolproject #bioblitz today. Kilve beach on the #Quantockhills was the location and way out on the low water mark, a nudibranch named, Fuzzy Onchidoris - Onchidoris muricata and a stunning Rose sun star - Crossaster papposus wowed us.

A photo of a tiny white nudibranch (type of sea slug) on a the silty floor of a rockpool. It's main features are the many short blunt blobs covering it.

A photo of an orange coloured starfish laying on a rock. The angle of the photo makes this creature appear as a hand with two thumbs and four fingers wearing a prickly textured glove. This starfish has twelve arms in total, the other six arms are just about showing in the background.

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Robert Boessenecker, Dr. of Whaleontology ™️ @coastalpaleo.bsky.social · 16/03/2026

Short thread of more #tidepooling photos from the last king tides Sunset Cliffs, San Diego. 1. White spotted sea goddess nudibranch, Doriopsilla albopunctata.🦀🦑

A rather round white-spotted sea goddess nudibranch. It looks like a yellow shield with two small rhinophores and many white tubercles.

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Brian G Weber Photography @briangweber.com · 17/03/2026

☘️ St. Patrick's Day has arrived! ☘️ Here's one of our green friends from the underwater world. This is a Costasiella kuroshimae, commonly nicknamed "Shaun the Sheep." Prints: buff.ly/Yye2jdV #macro #nudibranch #underwaterphotography #critters #scuba #scubadiving #philippines #tiny

A green sea slug fills most of the frame despite being incredibly tiny. The slug has translucent protrusions filled with easily visible green plant cells and tipped in white. The "face" of the nudibranch has beady eyes like a Wallace and Gromit character. The animal is crawling on a green piece of algae with individual grains of sand easily visible.

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Ocean Hoptimism @oceanhoptimism.org · 22/03/2026

You know we can’t pass up nudibranch news… These sea slugs don’t build color the usual way—they create it by bending light with tiny crystal structures. No pigment, just optics and built-in shimmer. Nature really said: why paint when you can harness the power of physics? #OceanHoptimism #Nudibranchs

phys.org

Impressionist sea slugs create their patterns by arranging colorful photonic crystals

Nudibranchs are often referred to as the butterflies of the sea. Nudibranchs live worldwide, primarily in warm, shallow marine regions, and stand out for their flamboyant colors and diverse shapes. A ...

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Hey Crystal Smith Illustrates @crystalsmithart.bsky.social · 20/03/2026

Streaked Chromodoris #nudibranch — Oh, what fun to paint these colorful sea slugs! #nudibranches #sciart #illustration #illustrator #kidlit #kidlitart

Streaked chromodoris nudibranch illustration with purple and red background. The nudibranch is white with a yellow border, black stripes (gills), and a red star of tentacles coming out of the butt.

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Abi Stevens MCM Ldn R-12 @abistevensart.bsky.social · 23/03/2026

Lil nudibranch doing its thing #illustration

Digital illustration of a blue angel nudinbranch covered in eyes on a dark blue background with a pattern of eyes, and a purple border full of more eyes, and two circular vignettes featuring a pink crab and brain coral, both with eyes on.

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でんか @k-hermit.com · 09/03/2026

Whenever I see posts like “Instead of going out drinking or doing karaoke, I just want to stay home and play Super Smash Bros.,” I can’t help but think, “Why not just do what you like?” Meanwhile, I’m here enjoying tidepooling, reading them with a completely straight face.

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Rivers @chrisrivers.bsky.social · 11/03/2026

There were gorgeous nudibranchs near my house today. Zoom in to see their little horns!!

Orange-yellow nudibranch (sea slug) barely under the ocean water

Two Orange-yellow nudibranchs (sea slug) barely under the ocean water

Orange-yellow nudibranch (sea slug) out of the ocean water with kelp and rocks exposed by low tide in the background

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Nudibranch ウミウシ Appreciation Society @nudibranch.bsky.social · 12/03/2026

Hat's off to everyone who's sharing nudibranch photos and art with such wonderful alt text. And a reminder that I'd love to share any and all nudis that have descriptive alt text. And yes, I always check before I repost because the glory of sea slugs should be accessible to all.

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Brian G Weber Photography @briangweber.com · 27/02/2026

I had seen Red-tipped Sea Goddess nudibranchs only once or twice before, but I saw probably 10 of them on this trip to the Bahamas. Captured with my Olympus OM-1 + 60mm macro + AOI +20 diopter Prints: buff.ly/Hd7lQco #nudibranchs #underwaterphotography #macro #sand #olympus #om1 #nauticam 🦑 📷

A red-tipped sea goddess nudibranch crawling on the sand. The main body is white with a ribbon of yellow around the edges and a line of red inside that. The rhinophores and gills are both tipped with red.

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New-Cleckit Dominie @ncdominie.bsky.social · 26/02/2026

An origami nudibranch looks itself up in the nudibranch book. (Origami by @neilbanas.bsky.social and others, from an exhibition at the Transmission Gallery, Glasgow.)

A spiny nudibranch (sea slug) made of elaborately folded paper, crawling onto a page with pictures of other sea slugs (nudibranchs).

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Bugz n Slugz @moistmacro.bsky.social · 28/02/2026

So this was the result from this mornings dive in the Abu Dhabi Marina. Very poor visibility and masses of silt did not mar good conditions - but was much better than what was going on up in the sky at the time.

A photo of an undescribed Goniobranchus Nudibranch from Abu Dhabi. It’s mainly white but covered in claret spots

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pikaole @pikaole.bsky.social · 28/02/2026

Cookies and cream and sea slug 🍪

There are similarly colored (black and white) sea slugs on top of the cookies and cream dessert.

Nudibranch species : Phyllidiella annulata, Hallaxa fuscescens, Dotted nudibranch (Jorunna funebris), Striped Phyllidiopsis (Phyllidiopsis xishaensis), Gymnodoris nigricolor, Fellow's Nudibranch (Hiatodoris fellowsi), Black Doris (Dendrodoris nigra), Black Spotted Nudibranch (Ceratophyllidia papilligera), Phyllidia scottjohnsoni, Trapania naeva, Bumpy Paradoris (Paradoris liturata), San Diego Dorid (Diaulula sandiegensis)

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Robert Boessenecker, Dr. of Whaleontology ™️ @coastalpaleo.bsky.social · 04/03/2026

#worldwildlifeday A couple of days ago I tried flipping rocks while #tidepooling... and found my favorite #socal nudibranch (sea slug), MacFarland's chromodorid (Felimida macfarlandi). 🦑🦀

A split image showing the flipped over rock on the left, and on the right, a macro shot of a light purple sea slug with three yellow stripes and a yellow and white stripe around its margins.

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Chelton's Bird and Wildlife Photography @bird-photography.bsky.social · 03/03/2026

Nudibranchs are so amazing. This orange-tipped nudi caught some nice light underwater for this shot #nudibranch #nudibranchs #underwaterphotography #omsystem #olympus #wildlife #animals #wildlifephotography

A crazy-looking sea slug - or nudibranch - crawls on brown seaweed underwater. Its body is a glowing, ghostly white and is covered in soft, wiggly, long spikes. Each spike has a streak of black through the center and is tipped with an orange and white accent. Two horns stick out of its head and have a ribbed texture.

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Gregory Rothman @gregoryrothman.bsky.social · 07/03/2026

#GoniobranchusGeometricus Such a long name for such a diminutive critter. #EastCoastKin #ColorADay #GreenSat #Scuba #OceanLife #PhotographersUnited #NikonZ8

A small sea slug called Goniobranchus geometricus crawls slowly across a sandy seafloor. The animal is about the size of a thumb and shaped like a soft oval with a wide skirt around its body. Its surface is deep violet-purple and covered with many rounded white bumps, giving it a texture similar to a tiny cluster of pearls or a soft pinecone.

The outer edge of the body forms a ruffled white rim that looks like a delicate border around the slug. Rising from the front are two tall sensory organs called rhinophores. They are pale at the base but fade to bright green at the tips, resembling small green antennae. Just behind them is a feathery cluster of gills, also tinted green, standing upright like a tiny underwater plant.

The nudibranch sits on coarse brown sand scattered with bits of rock and algae. The background fades into soft blue and gray tones, suggesting deeper water and making the slug’s vivid colors stand out sharply against the muted seafloor.

Interesting facts:
Toxic warning colors: The bright purple, white, and green coloration warns predators that the slug is chemically defended.
Stolen defenses: It feeds mainly on sea squirts (tunicates) and can store their defensive chemicals in its own tissues.
Shell-less mollusk: Although related to snails, nudibranchs lose their shells as adults.
Sensitive “antennae”: The green rhinophores detect chemicals in the water, helping the animal find food and mates.
Simultaneous hermaphrodite: Each individual has both male and female reproductive organs, allowing two slugs to fertilize each other when they mate.

Despite its striking appearance, this species usually moves slowly and quietly across tropical Indo-Pacific reefs, where it blends surprisingly well among sponges and tunicates it feeds on.

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John R. Platt @johnrplatt.bsky.social · 04/03/2026

The Nudibranch That Broke in Two A colorful sea slug offers @oceanhoptimism.org an opportunity to reflect on science, conservation, taxonomy, and wonder. Today on @therevelator.org therevelator.org/the-nudibran...

therevelator.org

The Nudibranch That Broke in Two • The Revelator

A meditation on observation, revision, and the quiet thrill of being wrong — and what all of that means for conservation.

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