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THE VERTEBRATE PEDIGREE
WHOS WHO AMONG THE VERTEBRATES
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adult amphibians ancestral animal appear arch artery associated become birds blood body bone bony brain braincase cartilage cavity cells centers close common comparable complex condition connective containing cord cranial nerves derived dermal Diagrams dorsal duct early elements embryo external fibers Figure fishes forms function further gill glands head heart higher important internal kidney lateral layer limb living lower lungs major mammalian mammals materials membrane mesoderm muscles musculature nerve noted opening organs origin paired plates position posterior present primitive reduced region relatively remain reptiles seen segment sensory separate sharks side similar single skin skull specialized stage structure surface tail teeth teleosts tends termed tetrapods tissue trunk tube typical urodeles usually various vein ventral vertebrates vessels visceral