Full Version: please help identify shell
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I picked the shell in the image below/attached from seabed during a dive in Gulf of Thailand.
I asked both the diver master and a fisherman there and none of them had a clue what this was.

It's so strange a shell. I really wanted to know what it'd looked like when it'd been alive!
attached is how the shell's bottom looked
it's a sea urchin  Smile, but I don't know the species...... .
Kind regards: wolf
thanks for the great tip
I looked up further on internet
and I think they're called heart urchins, FYI!