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This Concept Map, created with IHMC CmapTools, has information related to: Untitled, Gnathostomes Derived characteristics include Enlarged forebrain for enhanced senses, Vertebrates Would develop jaws Gnathostomes, Ray-finned fishes (Actinopterygii) ???? The fins supported by rays and have rigid skeletons. their body has morphed over years and the fin structure that affects the maneuvering, defence, and other functions., Invertebrate Chordates ???? Tunicates, Fishes ???? Ray-finned fishes (Actinopterygii), The Evolution of Vertebrates ???? Vertebrates, Gnathostomes Derived characteristics include Mineralized/bony skeleton, Lobe-finned fishes (Sarcopterygii) d the key diverse features are the presents of the rod-shaped bones surrounded by a thick layer of muscle in their pectoral and pelvic fins., Ray-finned fishes (Actinopterygii) ???? They can obtain the food and interferes with migratory pathways and sprawling grounds., Gnathostomes Developed lung or lung derivative Osteichthyes, Mineralized/bony skeleton Some would replace bone with cartilage Chondrichthyes, Jawless fishes (Cyclostomes) rudimentary vertebrae Lampreys, Vertebrates Derived characteristics include Two or more sets of Hox genes, The Evolution of Vertebrates Some chordates lack vertebrae 4 features of all Chordates: notochord, Dorsal hollow nerve cord, pharygeal slits, post-anal-tail., Gnathostomes Derived characteristics include The evolution of jaws, Lobe-finned fishes (Sarcopterygii) ???? they may have used their lobed fins to help them move across logs or the muddy bottom., Ray-finned fishes (Actinopterygii) ???? thy have a Swim bladder which enables them to maintain buoyancy as they move up or down in the water., The Evolution of Vertebrates Some chordates lack vertebrae Invertebrate Chordates, Gnathostomes Derived characteristics include 4 sets of Hox genes, Jawless fishes (Cyclostomes) rudimentary vertebrae Hagfish