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This Concept Map, created with IHMC CmapTools, has information related to: Vertebrates-Group 1, Vertebrates Derived characteristics include Neural crest tissue, The Evolution of Vertebrates ???? Vertebrates, Hagfish Rows of slime glands secrete a substance that abosorbs water. This repulses other savages., Gnathostomes Derived characteristics include Mineralized/bony skeleton, The Evolution of Vertebrates Some chordates lack vertebrae 4 features of all chordates: notocord, dorsal hollow nerve cord, pharyngeal slits, post anal tail, Osteichthyes Aquatic osteichthyans are called Fishes, Vertebrates Would develop jaws Gnathostomes, Vertebrates Derived characteristics include Skull and development of vertebrae, Osteichthyes Derived characteristics include ????, Gnathostomes Derived characteristics include 4 sets of Hox genes, Vertebrates Derived characteristics include Two or more sets of Hox genes, Lampreys Jaws might have evolved from skeletal supports of pharyngeal slits., Invertebrate Chordates ???? Tunicates, Largest and most diverse groups of chondrichthymas includes sharks, rays, and skates. Chondrichthyes, Gnathostomes Derived characteristics include The evolution of jaws, Mineralized/bony skeleton Some would replace bone with cartilage Chondrichthyes, Gnathostomes Derived characteristics include Enlarged forebrain for enhanced senses, Vertebrates Some early vertebrates lacked jaws Jawless fishes (Cyclostomes), Jawless fishes (Cyclostomes) rudimentary vertebrae Hagfish, Jawless fishes (Cyclostomes) rudimentary vertebrae Lampreys