Clitellata is a Class of Annelidworms. Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... Classes and subclasses Class Polychaeta (paraphyletic?) Class Clitellata Oligochaeta - Earthworms and others Acanthobdellida Branchiobdellida Hirudinea - Leeches Class Myzostomida Class Archiannelida (polyphyletic) Class Echiura *Some authors consider the subclasses under Clitellata to be classes The annelids, collectively called Annelida (from Latin annellus little ring), are a large phylum of animals, comprising... A worm is an elongated soft-bodied invertebrate animal. ...
Orders Arhynchobdellida Rhynchobdellida *There is some dispute as to whether Hirudinea should be a class itself, or a subclass of the Clitellata. ... Orders Arhynchobdellida Haplotaxida Rhynchobdellida The Oligochaeta or few-bristled worms (singular Oligochaete, IPA /ˈɒlɪgoʊˌkit/) are well-segmented Annelids, most with a spacious coelom that is used as a hydroskeleton. ...
Traditionally, Oligochaeta and Hirudinea were combined into Clitellata which was considered as a sister group to Polychaeta; both Clitellata and Polychaeta constituted the phylum Annelida, while Echiura and Pogonophora were treated as separate phyla.
Thus the posterior relocation of the brain, which is inferred as having occurred in the phylogeny of the Clitellata, was demonstrated.
Consequently, position of the supraoesophageal ganglion (brain) in the Clitellata, far behind the prostomium, was regarded as a secondary structural adaptation to a life spent burrowing through relatively firm terrestrial substrates.
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