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Protochordata are also known as Acraniates.
this sub group has 2 sub-phyllum
which are: 1. urochordata, It's examples are ASCIDIA, SALPA, DOLIOLUM, PYROSOMA,HERDMANIA
 2: cephalochordata It's example is BRANCHIOSTOMA(AMPHIOXUS OR LANCELET)

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Balanoglossus and amphioxus
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