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In which subphyla are the protochordates separated

In which subphyla are the protochordates separated? Write down some representatives of each protochordate subphylum?

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Urochordates (and also named as tunicates) and cephalochordates are two subphyla in which protochordates are separated.
Ascidians, sessile animals resembling to sponges, are instances of the tunicates. Amphioxus, well-studied in the Embryology, is an instance of the cephalochordate.

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