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Ecdysozoans shed/molt a tough external coat known as a cuticle as they grow up.

Lophotrochozoa do not shed/molt a cuticle. They can either develop a lophophore (a crown of ciliated tentacles used for feeding), or a trochophore larva (a distinctive larval stage). Some don't develop either of these, and there are other morphological features within the group.

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12y ago

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