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Annelid (421 words) |
 | The earliest larval stage, which is lost in some groups, is a ciliated trocophore, similar to those found in other phyla. |
| The arthropods and their kin have long been the closest relatives of the annelids, on account of their common segmented structure, but a number of differences between the two groups suggest this may be convergent evolution. |
| The other major phylum which is of definite relation to the annelids are the molluscs, which share with them the presence of trocophore larvae. |
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