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| phylum comprised of annelids |
| phylum of worms with bilateral symmetry and soft, usually flattened bodies |
antimere an·ti·mere (ān'tĭ-mēr')
n.
A segment of an animal body formed by planes cutting the axis of the body at right angles.
One of the corresponding parts of a bilaterally symmetrical organism.
The right or left half of the body.