Brachiopods
Shell where the valve is symmetrical in itself. The two valves are not symmetrical to each other. This animal lived connected to the sea floor, filtering foodparticles from the seawater. They occur in sediments since the Cambrian period until recent. They where most numerous in the Paleozoic.

Example of the brachiopod. The shell itself is symmetrical, but the two valves of the shell are not symmetrical.
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