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.

References in periodicals archive ?
La mayor densidad fue del phylum Arthropoda, dentro del cual la clase Insecta fue la que presento mayor densidad (65,1%), seguida de la clase Diplopoda (23,5%), Chilopoda (6,1%), Malacostraca (3,3%), Arachnida (1,3%); Clitellata del phylum Annelida (0,4%) y Adenophorea del phylum Nematoda (0,3%) fueron las que presentaron menor densidad.
By analogy, stochastic variation in growth hormone levels across the Clitellata as a consequence of random genetic variance may explain the occasional and punctuated (Eldredge and Gould, 1972) appearance of giant earthworm species in a variety of habitats worldwide.
Papers on selected groups of annelida include non-leech clitellata, hiradina, phyllodocida, cirratuliformia, sabellida, spionida and problematic annelid groups.
Class 4 Clitellata (Freshwater and Terrestrial Bristle Worms, Leeches)
The giant earthworms, as well as the common earthworm, Lumbricus terrestris, taxonomically belong to the Class Clitellata in the Phylum Annelida.