Cephalochordates are Urochordates are marine organisms. • Protochordates have chamber less hearts, but euchordates have hearts with chambers (2 to 4 chambers). Filed Under: Biology Tagged With: Acraniata, Craniata, Craniata and Acraniata, Craniata and Acraniata difference, euchordate, euchordate definition, euchordates, protochordate, protochordate and euchordate, protochordate definition, protochordates. • Unlike in protochordates, notochord is covered or replaced by a vertebral column in euchordates. All rights reserved. The adults are mostly degenerate, sessile forms. The chordates exhibit different gradations of structural organisation from simple to complex. However, they do form a major division of Chordata. These are only found in the organisms belonging to phylum Chordata. Small marine animals, they are found in great numbers throughout the seas of the world. The Chordates are identified by the presence of a notochord. Compare the Difference Between Similar Terms. Terms of Use and Privacy Policy: Legal. (6) Coelomate animals having a true coelom, enterocoelic … So they don't have these chordate characteristics as adults. While in vertebrates, vertebral column replaces the notochord. The body is enveloped by a tunic or test. These organisms are extremely marine and have small sized bodies. 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