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Jeffery
Lindsey3628
It's bad that you can't enlarge the photo, otherwise you can't see it at all.
Alicia5489
impossible to identify, very small photo, take a new photo
Michelle1505
Most likely a nudibranch... however, it wouldn't have stayed on the rock for long, it would have already disappeared from sight... Or maybe it's some kind of isopod, something similar is found in the Black Sea, but there it has little legs that are almost invisible under the hard chitinous shell... Or maybe it's a type of stomatella... in short, it's hard to determine...
Melissa3200
Tomorrow I will try to take a photo again. If it doesn't run away. Although it's suspicious, I noticed it just yesterday, it's been sitting in one place for a day, but it seems alive.
Jennifer9100
There are Igors, I have observed them many times, both at home and in service, they are quick, however, they can often be seen when you lift stones, they often sit under them and quickly crawl away to hide when disturbed. You can be calm about them, they are harmless and are not harbingers of trouble as such... rather the opposite.
Kenneth7331
Examining the creature with a magnifying glass from all sides, I came to a preliminary conclusion that it is some kind of tube worm.
1. It stays in one place.
2. Antennae sometimes extend up to 5-6 mm, and it seems like a head is visible.
3. The only thing that confuses me is that the tube is not calcium-based as usual, but rather leathery.
I will wait until it grows.
Catherine
It resembles a worm of the family Spionidae; if it is, then there is no need to worry, these worms are filter feeders.
Thomas1044
No, this one is different. I have ones like in the photo, but they build a little house out of sand grains, while the one I was asking about has short antennae, and most importantly, the tube is leathery and clearly shows several longitudinal blue stripes. It stays in one place, has grown about 1-1.5 mm. Let it grow a bit more, then the photos will be better. Waiting...