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
oral opening (water in)Adult Tunicate
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