Hemichordata

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Hem·i·chor·da·ta

(hem'ē-kōr-dā'tă),
A phylum composed of soft-bodied, bilaterally symmetric wormlike marine animals with gill-slits to the pharynx and a conical proboscis; a ciliated larval stage resembles that of echinoderms.
Synonym(s): Hemichorda
[hemi- + Mod. L. chordata, having a notochord, fr. G. chordē, string]