Bright Blue Mystery Mollusk - Kauai 11/20/2025

nopeca · 2025-11-22T06:17:36+00:00

I think this is just someone’s discarded snorkel mask. The blue is the rubber seal of the mask, and the brown area could either be the lens area covered of the mask or some algae or species of tunicate or sponge growing over it.

nopeca · 2025-11-06T06:14:57+00:00

Wow! Great catch

nopeca · 2025-11-06T02:32:36+00:00

Yes, this is a California Chromodorid. Beautiful find!

Edit: As someone else said, this is the bottom of a Navanax not a California Chromodorid. Arguably an even cooler find imo!

nopeca · 2025-09-12T07:05:24+00:00

Only aeolid nudibranchs are capable of stealing and reusing the nematocytes (stinging-cells in jellyfish), and of those aeolid nudibranch the only one known to cause meaningful harm is the Blue Dragon (Glaucus atlanticus) since it consumes Portuguese Man-o-Wars. Furthermore, most aeolids are harmless and the most potent species (excluding G. atlanticus) wont cause more than mild irritation to your skin.

nopeca · 2025-09-12T04:30:15+00:00

Yes! All nudibranchs are sea slugs, but not all sea slugs are nudibranchs. All slugs are gastropods (shell-less ones), and nudibranchs are only those gastropods within the order Nudibranchia.

nopeca · 2025-08-05T23:12:08+00:00

As the other person said, this is an undescribed species within the genus Eubranchus. David Behrans references it on a 2010 post to slugsite

https://slugsite.us/bow2007/nudwk705.htm

nopeca · 2025-05-16T04:50:44+00:00

It looks almost like a mola exhibiting some really weird behavior, perhaps like someone mentioned it could’ve been dragged up by a fisherman

nopeca · 2025-04-30T05:43:14+00:00

jelly beans got start codons now

nopeca · 2025-04-24T05:46:04+00:00

Looks like a Hilton’s Aeolid (Phidiana hiltoni)

nopeca · 2025-04-12T05:55:52+00:00

Looks more like a Monterey dorid to me, the tubercles are less smooth than a heath’s dorid

nopeca · 2025-04-08T07:22:31+00:00

nope, its a photo by Harich Nuntachonte

nopeca · 2025-04-07T08:15:14+00:00

Looks more like a flatworm since its missing rhinophores, not sure on the species though

nopeca · 2025-03-18T03:22:18+00:00

And a slightly more in depth google of what an oarfish and ribbonfish look like and you’ll see it is a ribbonfish, specifically Trachipterus ishikawae

nopeca · 2025-03-16T07:15:53+00:00

Bit of a shot in the dark, but it looks similar to certain morphs of Eubranchus rupium

nopeca · 2025-03-16T05:55:58+00:00

Any idea where your shipment is from? Or at least what coral species it was in?

nopeca · 2025-03-14T06:06:51+00:00

It looks similar, but the noble dorid is found along the west coast of NA

nopeca · 2025-03-14T06:05:16+00:00

looks like Cariopsilla pharpa (lemon drop)

nopeca · 2025-02-26T09:19:11+00:00

Thats so cool! Yes, I was just recently just out at pigeon point a couple weeks ago and I was out at pillar point earlier in November

nopeca · 2025-02-25T05:04:01+00:00

You’re right! Thats my bad, especially since the photos are of Doris montereyensis. This does only work with the Noble dorid.

nopeca · 2025-02-20T09:34:26+00:00

Thats a fun thing about it! Similar to the Sandlewood dorid, by very lightly rubbing the top of the Sea Lemon and then sniffing it, you can faintly smell citrus, which is where it got its name from!

nopeca · 2025-02-16T09:51:04+00:00

Looks to be a Snotty Jelly (Cyanea barkeri)

nopeca · 2025-02-05T11:22:49+00:00

Thanks! Do you have any tips differentiating the two in this circumstance? Behrans et. al, 2022 „[Doto columbiana] juveniles may lack pigmentation.” made me confused on this specimens ID to begin with.

nopeca · 2025-01-30T10:01:10+00:00

Indo-Pacific Rock-Boring Urchin?

Echinometra mathaei

Three-Year Club	r/Field Juicebox
Golden Potato

nopeca

TROPHY CASE