Question

In chordates, what is the long supporting rod that runs through the body called?

Answer 1

Mesodermal skeletal rod supporting body of chordate, in embryonic stage, is called notochord .

Explanation:

1. Please remember that in most chordates, notochord is partly or fully replaced by vertebral column.
2. Then there are some, which lose the notochord during metamorphosis.
3. And only a single small group, called lancelets, retain the notochord throughout life.

Accordingly, Phylum Chordata is divided in three subphyla:

1. Vertebrata (=Craniata)
2. Tunicata
3. Cephalochordata

Following diagram is of lancelet:

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