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Clitellata

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Clitellata 

a group of annelid worms that includes two classes: Oligochaeta and Hirudinea. The worms are hermaphroditic. They are characterized by a clitellum—a glandular thickening of the skin located in the anterior half of the body. The clitellum forms the cocoon, in which egg fertilization and embryo development occur.



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Papers on selected groups of annelida include non-leech clitellata, hiradina, phyllodocida, cirratuliformia, sabellida, spionida and problematic annelid groups.
 
 
 
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