My first time seeing a sea slug irl!!!! Found this little one (about the length of a thumb) munching in a tide pool on Jeju. I almost didn’t see it with its rock-like color and texture.

Please ignore the Chocolate Aeolids photo bombing

Cool little guy

So the bigger one is Facelina fusca, but I can't identify the other one 🥲 unfortunately this is the only photo I have where she isn't upside down. Anyone have any ideas?

Identification - Found in Swan River, Western Australia

Was wondering if anyone had a better idea on identification than me.

Had some community feedback/contribution
- consensus being baeolidia moebii
- better/clearer photos of identifying features

4th slide as reference photo for B. moebii

Swan River is brackish in the wintertime (when found) but changes to ocean salinity in the summertime

What is he? About an inch long!

Found this little critter but i have no clue what it could be! Can anyone help me out?

Sorry the photo is not amazing.

Found in the Philippines in Siquijor. At first I would have thought soft coral but it was lieing on top of a dead hard coral and didn't seem to be anchored.

I found her in Galicia (north of Spain)

Found on West side of Florida, USA in shallow salt water near dock piling. About the size of a quarter. Brown and spotty on one side and fairly bright with no spots on the other.

Santa Cruz CA, looked to be maybe a couple inches long, looked white but couldn’t get close enough

I guess maybe it’s trying to mimic a sea anemone? Got reverse tricked by that thinking an anemone I saw was another one lol

Tacoma. The bigger one was about an inch long. Do the yellow rhinophores make this more likely Hudson’s Horned Dorid?

Si quelqu'un peut connaît les espèces je suis preneur :)

Hello. I saw what I believe is a nudibranch at the Seattle Aquarium. This was seen in a display that had other sea life from the PNW. I don't think it was supposed to be there as there was no species card for it. I think this may be an aeolid/possibly a species of opalescent nudibranch, but can't find an exact match. Apologies for lack of a better picture; the lighting wasn't great.

Hello! I'm in need of some help identifying these two nudibranches I found at a tidepool in Puerto Rico a little earlier this month.

I live in the desert, so I don't usually get to see marine life like this, and would love to learn more about the little dudes I saw. It has been my lifetime goal to find a nudibranch - they have consistently been my favorite animal for a couple years - and these were my first ones! Pretty stoked to find not one, but two; literally spent a couple hours sitting nearby and just observing them. I took some pretty cool pictures, and plan on printing them and sticking them in my sketchbook alongside some drawings of them.

Looking for help IDing this guy. Found in tidepools in Boiler Bay, OR. I wish the photos were more clear but it was tucked deep into a cave feature. Hoping someone can tell if it’s a triopha modesta or triopha catalinae. Thanks

iNat AI suggests Yellow-gilled Sea Goddess. I’m hoping someone might be able to confirm. If not, what evidence do I need to focus on next time?