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

1 Answer
Feb 17, 2017

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


  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: