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Into which subphyla are the protochordates classified

Into which subphyla are the protochordates classified? Write some representatives of each and every protochordate subphylum?

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Urochordates (that is, tunicates) and cephalochordates are the two subphyla into which protochordates are classified. Ascidians, sessile animals identical to sponges, are illustrations of tunicates. The amphioxus, well-studied in Embryology, is an example of cephalochordate.

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