Which taxonomic class consists of fish that have the following: • Cartilaginous skeleton • No jaws and no scales • No paired appendages Petromyzontida Actinopterygii Chondrichthyes
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The fish has a cartilaginous skeleton, no jaws, no scales, and no paired appendages. Show more…
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Adi S.
Match the following fish or fish-like Vertebrate classes to their descriptions below. Class Myxini Class Chondrichthyes SuperClass Osteichthyes Class Cephalaspidomorphi These "fish" lack jaws, ossified bones, scales, and paired fins, and have seven or more pore-like gill openings. They lack any vertebrae (not true vertebrates). They retain the notochord as adults. They are scavengers or predators of mollusks and other fish. These "fish" lack jaws, ossified bones, scales, and paired fins, and have seven pore-like gill openings. They have cartilaginous vertebrae, and a toothed mouth which is used in some species to bore into the flesh of other fish and suck blood. These jawed fish have paired fins with rays, paired nares, a heavy internal skeleton made completely of bone, a swim bladder, and gills with opercula. These jawed fish have paired fleshy fins, paired nares, scales, vertebrae, skeletons made of cartilage, and 5-7 gill slits.
This phylogenetic hypothesis shows the relationships among major clades of vertebrates. Derived characters are listed for some clades; for example, only gnathostomes have a jaw. In some lineages, derived traits have been lost over time or occur in reduced form; for example, hagfishes and lampreys are vertebrates with highly reduced vertebrae. Based on the phylogeny in the figure, which vertebrate group would have jaws and a mineralized skeleton, lungs or lung derivatives, and lobed fins but no limbs with digits? Tetrapoda Dipnoi Actinopterygii Chondrichthyes
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