Biology (NTSE/Olympiad)  

4. Diversity In Living Organism

Sub-phylum : Protochordata

Sub-phylum : Protochordata
The sub-phylum protochordata includes animals which are bilaterally symmetrical, unsegmented, tripolblastic and have a body cavity or coelom.
The animals belonging to protochordata possess a notochord at some stage in the life history. This is flexible rod that lies between the dorsal nerve tube and the gut.
The notochord provides a place for muscles to attach. It increases internal support and locomotory power.
Protochordates are usually marine, soft, have worm-like or vase-like forms.
Examples : Balanoglossus (a corn worm or tongue worm), Herdmania and Amphioxus, etc.

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