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No, leeches do not have setae and that is one of the major differences that sets them apart from organisms such as earthworms or other marine worms when categorizing them in classes. So leeches/earthworms/and marine worms are all in the same Phylum - Phylum Annelids (Segmented Worms) but they're all in separate classes.

So Polychaeta (Marine Worms) and Oligochaeta (Earthworms) - have many setae but Hirudinea (Leeches), do not.

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15y ago

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