Nudibranch ウミウシ Appreciation Society (@nudibranch) — Bluesky Profile

1 day ago

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

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

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11 hours ago

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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1 week ago

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.

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 🦑 📷

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1 week ago

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

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.)

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1 week ago

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

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.

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11 hours ago

LOOOOOOOVEEEEEE

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1 week ago

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)

Cookies and cream and sea slug 🍪

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1 week ago

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.

#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). 🦑🦀

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1 week ago

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.

Nudibranchs are so amazing. This orange-tipped nudi caught some nice light underwater for this shot

#nudibranch #nudibranchs #underwaterphotography #omsystem #olympus #wildlife #animals #wildlifephotography

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4 days ago

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.

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

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1 week ago

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.

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...

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1 day ago

The head of a baby Navanax - it is mostly black with some reflective blue patches, orange stripes, and many small yellow polka dots. The head is shaped like a chisel.

I spotted a baby Navanax sea slug (N. inermis) last week #tidepooling - only 2 cm long; very little blue, yellow spots more orange. These are opisthobranch slugs, related to sea hares, and hunt for and eat their nudibranch cousins (completely separate group of sea slugs!). San Diego, CA. #socal 🦑🦀

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6 days ago

Seeing this post about felt nudibranchs reminded me of my daughter's assignment for freshman-level art class: a watercolor painting of an animal you'd find in Monterey Bay. She picked my favorite nudi, the Hopkins Rose. 🦑

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1 day ago

a stack of four half size zines that say 'the little book of nudis' in hand script on a brown handmade watercolor paper background with a watercolor illustration of a black nudibranch

I've had the most traumatic time with my printer, but I finally got a couple of my latest zine printed. These are half size and very cute. I'll have them in my shop later this week and my patrons will get first dibs.

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3 days ago

Shaun the sheep nudibranch is a tiny green sea slug with purple tipped protrusions on its back, it has two black tipped antennae and black eye spots - it resembles the Shaun the sheep cartoon character

Shaun the sheep nudibranch, this cute ~3mm sap sucking slug lives on green algae in the Lembeh Strait #OM1 🦑🌊

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6 days ago

Dive into Wool Creature Lab's World of Vibrant Felted Nudibranchs How artist Arina Bovenich's job at a remote biology research station transformed into a unique craft practice.

Wow, amazing #sciart via @thisiscolossal.com

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3 weeks ago

The cover of the scientific journal the American Malacological Bulletin. It feature a photograph of the green sacoglossan sea slug Elysia chlorotica.

Made the cover of the latest issue of the American Malacological Bulletin. #sluglife

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1 month ago

Pink Sea slug dragon based on Rose's Nudibranch (Ceratodoris rosacea). Sprouting tendrils all over the body and a pair of feathered wings.

For the first time ever, I'll be offering different art postcards each month this year over on Patreon!

Starting things off with a pink sea slug dragon! It's never been in print before, so grab 'em while you can!

Click for more info:
www.patreon.com/posts/new-ar...

#seaslug #seaslugdragon

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1 month ago

a drawing of an anthro "nemesignis banyulensis" species of nudibranch, also known as orange godiva nuidbranch walking through the city. She is older, glamourous and absolutely massive. She has a purse which appears stiff like plastic as she holds it in the air behind her. buildings are destroyed behind where she's walking.

PSA FOR ALL FLORDIANS!!! GET INSIDE NOW!!! Theres a category 3 [nemesignis banyulensis] heading STRAIGHT for Palm Springs!!!!

#furry #nudibranch #furryart #eyestrain

(reference in replies)

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1 month ago

two slug cats sit on a rug drinking resting, they are rugged up in winter clothing. the one of the left looks like a demon with eyes covering their body and metal prongs for legs -their horns are clear and filled with fluid-. they are reading a book as opposed to the one on the right who is drinking a hot chocolate -this one is much brighter and has a tail very similar to a real nudibranch (sea slug).

hope yous are staying warm this winter :)))

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1 month ago

Pencil drawing in a sketch book with some parts smudged. It shows a woman lying on her stomach with the upper part of a nudibranch draped over her like a blanket with odd bumps and rather spectacular feelers. She is smiling and has no hair.

I had some time to draw tonight. So why not show my progress for WIP wednesday.

I am still trying to figure out a nudibranch mermaid. I should attach the rhinophores to her head better, I think.

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1 month ago

He/She glows.

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1 month ago

A digital illustration of a blue galucus nudibranch with multiple eyes along its body, framed by a purple border with eyes all along it and two circular vignettes of a small crab and a brain coral, both with added eyes. The inner background is dark blue.

And last but not least, the late addition to the roster: the print version of the Blue Galucus Nudibranch pin. 💙✨️
www.backerkit.com/c/projects/a...

#illustration #art #pintopia

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1 month ago

We approve this coffee shop.

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1 month ago

A nudibranch Tchotchke Guardian (porcelain, handmade).

🔗 ko-fi.com/summersuzuki

#art #sciart #disabledartist #ceramicart #potteryart

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3 months ago

the cover which says 2025 nudivember: 30 days of nudibranchs with half a nudibranch against a black watercolor background, the nudi is a gradient of purple to pink with yellow spots

a page from the book of nembrotha cristata featuring a watercolor illustration of a black sea slug with green spots, the text reads:
Nudibranchs often match their food, either for camouflage or because their food actively colors them, and this green species feeds on a green compound tunicates on coral reefs in the Indo-West Pacific where they grow up to 50mm long.

Here's the cover and a sample page of my 2025 #Nudivember ebook zine.

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3 months ago

Traditional drawing of a colourful seaslug called Mexichromis macropus. Its body is mostly white. The border of its mantle is decorated with orange stripes. It has purple bumps on its back. The rhinophores, gills, and tail end also have purple accents. The style aims for simple yet realistic.

A terribly late mexichromis macropus for #Nudivember day 24. I love these little sea creatures. They are so cute.

I want to turn this one into a nudibranch mermaid.

Watersoluble markers and waterproof liner. #traditionalart

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3 months ago

Drawing of nudibranch which looks like a fluffy orange blob with a snowflake on top. The species is acanthodoris lutea. It has two orange feelers at the front. At the back, it has a circle of white gills which look like a snow flake. The background is blue.

Another late nudibranch for #Nudivember: Day 26 Acanthodoris lutea, also called the orange peel nudibranch.

Colored pencil on toned paper. #traditionalart

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1 month ago

I'm wondering if this could possibly be the nudibranch Miamira moloch? Found in a rockpool near Mackay, Queensland, Australia after a week of cyclone weather, I'm guessing it may have been washed ashore?

OK, this has me truly stumped: possibly a #nudibranch (WAY out of my area of knowledge). It seems to resemble Miamira moloch, but any expert advice *very* gratefully received @nudibranch.bsky.social! Found in a tidal pool in Mackay, #Queensland. #seaslug #beach #wildlife #nature #sea #marine

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3 months ago

Nudivember 2025: 30 Days of Nudibranchs by Saimi An art zine featuring watercolor illustrations of 30 different nudibranchs from around the world

I've finished the ebook version of my 2025 #Nudivember zine! I put it up on Itch since my webshop is currently closed.

This is my first time listing anything there so I hope I did it right. If I have time this week I'll add my other zines before I leave.

saimi.itch.io/nudivember-2...

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