Biology / Unit 10 Bio 2249 short lesson, about 20 seconds
Lophotrochozoa Defined
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The idea
Lophotrochozoa groups protostome, per Bio 2225, animal phyla united by molecular evidence rather than one shared visible structure, including flatworms, mollusks, and annelids.
In practice
A flatworm and an annelid look structurally distinct, yet molecular data places both within Lophotrochozoa alongside mollusks and rotifers.
Where people slip
This grouping rests on molecular support more than shared morphology — it shows why animal phylogeny revises as evidence arrives.
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