Slug type creature

[joseflebondwaski]

Hi,
I bought a piece of liverock and got a couple of hitchhikers.
Could someone please help me identify what they are, and if they are safe or of concern.
They look kind of like a slug, or a snail without a shell.
When they move around, they are dark in colour and have a snout.
But sometimes that go into a ball and have a shiny white colour.
The attached pictures are of the same creature!

 

[Smarkow]

First pic sort of looks like a chiton, but the lower pic looks like a cowrie?
Also in the differential would be sea hares or nudis, or even snails that have lost their shells?
No expert, just a few guesses

 

[Smarkow]

Thanks for sharing

I’ll be curious to see what others think

 

[joseflebondwaski]

Thanks!
I have looked up pictures of all the things you mentioned, but nothing seems quite like these.
Perhaps they are just snails that lost their shells.
I actually quite like them - interesting how they change their appearance.

 

[WVNed]

I would say it a cowrie. The white is the shell. At times the cover it with part of their body giving them the dark color.

https://www.melevsreef.com/critter/tiger-cowrie

 

[vetteguy53081]

+1 on cowrie

 

[DeniseAndy]

Cowrie. Really neat creature. Plus now you added to your wealth!

 

[joseflebondwaski]

thanks very much.
Yes I think it is a cowrie, I found this article, which looks identical.

Cowrie snail | Melev's Reef

This tiny Cowrie is the size of an olive. It lived in a display tank at the local fish store for months amongst many corals, and did no harm. Since some cowries are herbivores, I decided to add it to my reef to consume any filamentous algae that it might find. It has a soft skin or mantle that...

www.melevsreef.com