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List the characteristic features that distinguish cartilaginous fishes with living jawless fi shes |
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Answer» chthyes is a class that contains the CARTILAGINOUS fishes: they are jawed vertebrates with paired fins, paired nares, scales, a HEART with its CHAMBERS in series, and skeletons made of CARTILAGE rather than bone. The class is divided into two subclasses: Elasmobranchii and Holocephali.Agnatha is a superclass of jawless fish in the phylum CHORDATA, subphylum Vertebrata, consisting of both present and extinct species. The group is sister to all vertebrates with jaws, known as gnathostomes. |
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