what is the difference between Non-chordates and Protochordates?
Kingdom Animalia is divided into chordates and non-chordates on the basis of the presence or absence of notochord. Non-chordates do not possess a notochord, whereas all members of phylum Chordata possess notochord. Protochordata is the subphyla of the phylum Chordata.
@ Sayantani: Good answer! Keep Posting!!