In 1885 WILLIAM BATESON proposed closer affinites with chordata and non-chordata.The resemblances shows on the presence of a notochord,nerve chord, and pharyngeal gill-slits(pharyngotremy).In cephalochordata and urochordatd the structure and function of pharynx and branchial apparatus are similar.In Branchiostoma the origin of coelom is enterocoelic.soHemichordata had been considered as subphylum of the chordata.
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