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Hirudinea are leeches. many are predators that feed on other invertebrates, but some are parasites that suck blood. body usually flat, chaetae(each segment has 4 pairs of chaetae, bristles that provides traction for burrowing) absent, sucker at anterior and posterior ends, parasites, scavengers.

Oligochaeta: freshwater, marine, and terrestrial segmented worms such as earthworms, reduced head, no parapodia, chaetae present. ^_^

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