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nudibranch.bsky.social
Nudibranch ウミウシ Appreciation Society
@nudibranch.bsky.social
1.9K followers 33 following 210 posts
A nudibranch and sea slug fan account, run by @saimihanma.bsky.social

#Nudivember

ウミウシ

Mostly repost nudis that have alt text

https://www.metrofieldguide.com/nas/
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nudibranch.bsky.social
Nudibranch ウミウシ Appreciation Society @nudibranch.bsky.social · Oct 29
Welcome to the 2025 #Nudivember art challenge!

Like last year, here is a list of some lesser known, yet always fabulous, nudibranch species.

Participate as much or as little as you want in any art form you like.

Make sure to use #Nudivember and use alt text!
Nudivember 2025 prompt list 1. Cuthona anulata 2. Cerberilla tanna 3. Halgerda theobroma 4. Glossodoris electra 5. Tambja affinis 6. Diaphorodoris mitsuii 7. Hypselodoris obscura 8. Cerberilla ambonensis 9. Tritonia myrakeenae 10. Chromodoris luteorosea 11. Dendrodoris behrensi 12. Melibe pilosa 13. Doto greenamyeri 14. Cadlinella ornatissima 15. Flabellina ischitana 16. Polycera tricolor 17. Jorunna rubescens 18. Nembrotha cristata 19. Tenellia caerulea 20. Phyllidiopsis sphingis 21. Gymnodoris rubropapulosa 22. Aegires citrinus 23. Okenia mediterranea 24. Mexichromis macropus 25. Hallaxa cryptica 26. Acanthodoris lutea 27. Notodoris minor 28. Favorinus tsuruganus 29. Halgerda brycei 30. Hallaxa fuscescens
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saimihanma.bsky.social
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...
Nudivember 2025: 30 Days of Nudibranchs by Saimi
An art zine featuring watercolor illustrations of 30 different nudibranchs from around the world
saimi.itch.io
December 2, 2025 at 9:07 PM
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michellejonesart.bsky.social
#Nudivember Day 30

(Acrylic gouache, Neocolor 2 crayons and colored pencil)
A yellow green background, with a gray nudibranch. The nudibranch gets more transparent around its edges, and is covered in black spots.
December 2, 2025 at 5:35 PM
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ketrinadrawsalot.bsky.social
#Nudivember concludes with Hallaxa fuscescens, a little black bunny.
Nudibranchs come in all shapes, sizes, and colors! Let them be a reminder that no creature design is too weird to exist.

#nudibranch #polkadots #blackrabbit #art #SciArt
A gray nudibranch with black rhinophores, black gills, and black spots on its mantle
November 30, 2025 at 11:21 PM
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michellejonesart.bsky.social
#Nudivember Day 27

(Posca markers and acrylic gouache on blue pastel paper)
A yellow nudibranch with black lines. The background is red and orange, with blue paper showing through on the edges.
December 1, 2025 at 7:56 PM
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liminalitea.bsky.social
And finally, nothing says #nudivember like December, and we should all marvel at Hallaxa fuscescens, and its perfect little creature energy.
A drawing of a grey nudibranch with black spots, rhinophores, and gills.
December 1, 2025 at 8:16 PM
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saimihanma.bsky.social
It's done!!! 30 days of #Nudivember. 30 glorious nudibranchs. One tired artist.
November 30, 2025 at 7:38 PM
nudibranch.bsky.social
It's the FINAL DAY of #Nudivember! And our last species to end the month is Hallaxa fuscescens.

Thank you to everyone who participated this year! I hope you had fun and enjoyed the nudibranchs and artwork.

Info: www.seaslugforum.net/find/22064
Photos: www.inaturalist.org/taxa/548310-...
November 30, 2025 at 7:35 PM
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ketrinadrawsalot.bsky.social
#Nudivember day 29: Halgerda brycei, the forbidden pineberry
#nudibranch #seaslug #bumpy #art #SciArt
A white nudibranch covered in orange-tipped papillae and sporting black gills and rhinophores
November 30, 2025 at 5:18 AM
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xenomatt.bsky.social
One last #Nudivember post. Here is Doriprismatica atromarginata coming to check you out. Most places seem to call this a black-margined nudibranch (rather boring) but I also saw it referred to as a cheesecake nudibranch, which is a much better name!

#MarineLife #Invertebrates 🌿
A nudibranch moving toward the camera over algae-covered rock. It is white, with a dark brown back and a black marginal band; it has black rhinopores and gills. The mantle is raised at the front so the oral tentacles are visible. #UnderwaterPhotography #MacroPhotography #Macro #Wildlife #WildlifePhotography #Nature #NaturePhotography
November 30, 2025 at 4:38 PM
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federgeistchen.bsky.social
I thought, I’d join in and post a nudibranch for the last day of #Nudivember. Here‘s Aeolidiella sp. I found in Spain in a rock pool
#MarineLife
Aeolidiella sp. against black background. It’s curled up a bit and has two rows of groups of 4 brownish cerata.
November 30, 2025 at 9:01 AM
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arithetonberry.bsky.social
#Nudivember Day 10- Felimida luteorosea

🐡 🐌 🐠🦑 Last one for today, I think :)
fat purple sea slug with big yellow spots
November 30, 2025 at 12:09 AM
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liminalitea.bsky.social
It's the penultimate #nudivember and today is Halgerda brycei, who has a built-in shrub.
A drawing of a white nudibranch with black feathered rhinophores, red-tipped cerata, and black gills that look like a small leafless bush.
November 29, 2025 at 7:02 PM
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arithetonberry.bsky.social
#Nudivember Day 08- Cerberilla ambonensis

🐡 🐌 🐠🦑
Digital illustration of a somewhat eye-searing sea slug with many colors
November 29, 2025 at 8:08 PM
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arithetonberry.bsky.social
#Nudivember Day 09- Tritonicula myrakeenae

🐡 🐌 🐠🦑

I did phone this one in bc drawing nudibranches w this shape is very frustrating for me. And I think I like this result better anyway! Yay for learning to take art shortcuts
Digital drawing of a semi-transparent sea slug with many small branches coming off of its back
November 29, 2025 at 9:28 PM
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michellejonesart.bsky.social
#Nudivember Day 26

So round! 🍊
(Acrylic gouache and posca markers on a background of paint and collage)
An orange nudibranch on a mottled and textured reddish brown and yellow green background.
November 29, 2025 at 10:28 PM
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saimihanma.bsky.social
Day 29 of #Nudivember and I'm so so so tired.
A watercolor illustration of a nudibranch sea slug that's white with orange tipped bumps all over it
November 29, 2025 at 10:34 PM
nudibranch.bsky.social
Our next to last #Nudivember species is Halgerda brycei

Info: www.seaslugforum.net/showall/halg...
More info: slugsite.us/bow/nudwk289...
Photos: nudipixel.net/photo/00012629
museum.wa.gov.au/online-colle...
November 29, 2025 at 6:20 PM
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liminalitea.bsky.social
It was unprecedented. They said it couldn't be done.

Yet, here is a quadruple #nudivember extravaganza featuring the enigma that is Hallaxa cryptica, the living banana chocolate dessert Notodoris minor, the tiniest dragon Favorinus tsuruganus and the glittery orange sugarlump Acanthodoris lutea.
A drawing of a grey blob with a pinkish centre and white spots. It has a tiny smily face drawn next to it. A drawing of a long yellow nudibranch with black rippling stripes. Its body is extremely lumpy and craggy, like it has grown out of a cliff face. A drawing of a nudibranch with a white body and front rhinophores, densely-packed red cerata with black tips, a red head, and black upper rhinophores with many pointed branches. A drawing of a rounded orange nudibranch with reddign rhinophores and pale pink gills. It is covered in very small pointed bumps.
November 28, 2025 at 6:56 PM
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saimihanma.bsky.social
Today's #Nudivember. Only two left!!
A watercolor illustration of a nudibranch sea slug that's got tons of orange cerata all over its back tipped in black
November 28, 2025 at 10:54 PM
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ketrinadrawsalot.bsky.social
#Nudivember day 28: Favorinus tsuruganus, the goat with the golden fleece (check out those rhinophores!)

#nudibranch #seaslug #art #chrysomallos
A white nudibranch with black horn-like rhinophores and black-tipped orange cerata covering its back
November 28, 2025 at 11:52 PM
nudibranch.bsky.social
We're almost to the end of #Nudivember and only have 3 nudibranchs left. Today's species is Favorinus tsuruganus.

Info: www.seaslugforum.net/showall/favo...
Photos: www.inaturalist.org/taxa/389587-...
November 28, 2025 at 5:29 PM
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saimihanma.bsky.social
Today's #Nudivember is the ocean version of the banana slug and manages to be way more banana.
A watercolor and sumi ink illustration of a nudibranch sea slug that's bright yellow with black markings and a weird hood cover for the gills on the back
November 27, 2025 at 8:23 PM
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ketrinadrawsalot.bsky.social
#Nudivember day 27: Notodoris minor, if a witch turned an Electabuzz into a slug
#nudibranch #seaslug #reallifepokemon #art
A bumpy yellow nudibranch with a black pattern resembling cracks
November 28, 2025 at 4:04 AM
nudibranch.bsky.social
It's day 27 of #Nudivember and our species today is Notodoris minor

Info: www.seaslugforum.net/find/notomino
Photos: www.inaturalist.org/taxa/504909-...
November 27, 2025 at 1:00 PM
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saimihanma.bsky.social
Here are 5 more days of #Nudivember. Only 4 left to go!! I need a reward for getting through 30 full days.
A collage of five watercolor illustrations of nudibranchs
November 27, 2025 at 12:39 AM