12 November 1999
Echinoderm locomotion
Water-vascular system
locomtion
foodgetting
Protochordates and chordates
salps--pharyngial basket
tunicates-adults are sessile, but larval stages show all the chordate  characteristics
pharyngeal gill basket, dhnc, notochord, and paired segmentally arranged myotomes
cephalochordates--amphioxus--fish-like, but lacks vertebral column
vertebrates--have vertebral column