Another ID Question

[umbrellacorp]

What are these? At first i thought they were just a piece of the liverock. There are several on there and ive noticed that they move. They look like big sand dollars or something. Thanks for the help.

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[brianjfinn]

Pretty sure those are limpets. Good find!

 

[umbrellacorp]

ive never even heard of a limpet. There are about three or four on one piece of live rock i bought (a beautiful piece.) Ill have to do some reading about these things. Thanks guys!

 

[darcurr]

They are slow moving predecessor to snails. People actually sell them online. Nice bit of biodiversity