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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.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「clitellata」の詳細全文を読む
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