Group Acraniata Protochordata Group Acraniata Protochordata Subphylum Urochordata
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Group Acraniata (Protochordata) อ. แนต
Group Acraniata (Protochordata) • Subphylum Urochordata • Subphylum Cephalochordata Group Craniata • Subphylum Vertebrata - Superclass Agnatha - Superclass Gnathostomata
Adult Larva
2 cm
Pikaia – 530 million years ago
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