Lophotrochozoa Defined
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Lophotrochozoa groups protostome, per Bio 2225, animal phyla united by molecular evidence rather than one shared visible structure, including flatworms, mollusks, and annelids.
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A flatworm and an annelid look structurally distinct, yet molecular data places both within Lophotrochozoa alongside mollusks and rotifers.
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This grouping rests on molecular support more than shared morphology — it shows why animal phylogeny revises as evidence arrives.