Urochordata
Vertebrata
Hemichordata
Echinodermata
blastopore becomes anus
skull
Cephalochordata
pharyngeal slits
tripartite coelom
water-
vascular
system
CaCO3
plate
skeleton
dual nervous system
segmented muscle blocks
notochord; post-anal tail
dorsal nerve cord
sessile
stage
true heart
neural crest; etc.
endostyle
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