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This Concept Map, created with IHMC CmapTools, has information related to: Vertebrates-Group 2, Lung fishes ???? Only six known species, Two or more sets of Hox genes Other important families of genes That produce transcription factors and signaling molecules are also duplicated, Dorsal Hollow nerve cord Develops Into the central nervous system, Is a longitudinal, flexible rod Location Between the digestive tube and nerve cord, Jawless fishes (Cyclostomes) rudimentary vertebrae Hagfish, Vertebrates Would develop jaws Gnathostomes, Dorsal Hollow nerve cord Develops From a plate of ectoderm that rolls into a neutral tube, Lung fishes ???? Can survive in the mud when there is little water, Notochord Provides Skeletal support, Tetrapods A group of Tetrapods Amniotes, Lateral line Function A series of pores down the body that detect changed in water pressure, Hagfish ???? Lack jaws & vertebrae, Gnathostomes Derived characteristics include Enlarged forebrain for enhanced senses, Lobe-fins ???? 3 lineages survive & include, 3 lineages survive & include ???? Coelacanths, Vertebrates Derived characteristics include Skull and development of vertebrae, Pharyngeal slits Develop Into slits that open the pharynx, 4 features of all chordates: notocord, dorsal hollow nerve cord, pharyngeal slits, post anal tail Feature 3 Pharyngeal slits, Viviparous ???? Embryo develops w/i uterus & is nourished through yolk sac placenta from mother's blood, Osteichthyes ???? Ray-finned fish