D064174Level 6

Cephalochordata

**Definition:** A subphylum of chordates intermediate between the invertebrates and the true vertebrates. It includes the LANCELETS. Its members are characterized by a NOTOCHORD which extends into the adult stage head.

**Tree numbers:** - B01.050.150.200.199 - B01.050.500.272.199

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D064175Lancelets

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