What is this circular object

[Lashis]

Hi there

While diving in Mexico I saw a couple of these things, our guide told us it was an animal, but didn't know the name, and I can't manage to get any hits when googling all sort of words =)
So, anyone knows what this is?

br Thomas

 

[mattleach]

Looks like a sand dollar

 

[tbone1004]

sand dollar, part of the same family as sea urchins, sea cucumbers, and starfish. super interesting little critters

 

[undrwater]

That one's dead.

 

[tbone1004]

That one's dead.

which funny enough is what most people recognize them as...
rather uncommon to see them or pictures of them alive picture below where you can see all of the little feet that they use to move food towards their mouths and to get around. Same way a sea urchin does

 

[diversteve]

Sand dollar - Wikipedia

 

[flyboy08]

Actually, that's only 87 cents in today's currency.

 

[RayfromTX]

The female version is only valued at 77 cents.

 

[Lashis]

Thank you for all your answers, that must be it then =)

 

[The Chairman]

Yes, the rare and elusive Sand Dollar that lives for the most part beneath the sand. Another reason to stay off the bottom... even sandy bottoms.