different between notochord vs cephalochordate

English

noto- +? chord

notochord (plural notochords)

A flexible rodlike structure that forms the main support of the body in the lowest chordates; a primitive spine
A similar structure found in the embryos of vertebrates from which the spine develops

From New Latin Cephalochordata, cephalo- +? chordate.

cephalochordate (plural cephalochordates)

Any of the primitive fishlike creatures, of the subphylum Cephalochordata, including the lancelets, that lack a true spine but have a notochord which, in the case of cephalochordates, reaches into the head, contrary to the Urochordata

cephalochordate (not comparable)

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