| 翻訳と辞書 | Clitellata 
 | image = Earthworm Miñoca 060106GFDL.jpg
 | image_caption = Earthworm
 | subdivision_ranks = Subclasses
 | subdivision =
 Branchiobdellae
 Hirudinea
 "Oligochaeta" (paraphyletic)
 and see text
 }}
 The Clitellata are a class of annelid worms, characterized by having a clitellum - the 'collar' that forms a reproductive cocoon during part of their life cycles. The clitellates comprise around 8,000 species.  Unlike the class of Polychaeta, they do not have parapodia and their heads are less developed.
 == Habitats ==
 Most clitellates live on land, in freshwater or in the ocean.
 
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