Animal Evolution – The Vertebrates. Chapter 23. Chordates. Most are coelomate, bilateral animals All share four features: Notochord supports body Nervous system develops from dorsal nerve cord Embryos have pharynx with slits Embryos have tail that extends past anus. Lancelet Body Plan.
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DORSAL, TUBULAR NERVE CORD
TAIL EXTENDING PAST ANUS
PHARYNX WITH GILL SLITS
gill slits (twelve pairs)
lungs or swim bladder
Four orders made it to the present day:
Snakes and lizards
“Uniquely” human traits evolved through modification of traits that evolved earlier, in ancestral forms