lancets
pharyngeal slits
Amphioxus
Tunicates
Lampreys and hagfishes
lancets
buried in the sand
hermaphroditic
gills or lungs
jawless
birds and mammals
hollow nerve tube
fishes, amphibians & reptiles
notochord
nervous system
spine
coldblooded
warm-blooded
exoskeleton
post anal
deuterostomes
urochordates
echinoderms and chordates
invertebrates, like insects
tunicates
muscular tail