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How does bilateral symmetry appear in a lamp shell shell?
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lamp shells
Lamp shells on the sea floor off the coast of Massachusetts.
In lamp shells, which belong to the phylum Brachiopoda, bilateral symmetry is defined by the shell's structure. Although the two valves (shells) are of unequal size, the right and left sides of the animal are mirror images of one another.12
This symmetry is a key characteristic of the phylum, with the valves typically oriented dorsally (top) and ventrally (bottom).12