|Class 9 Biology Diversity In Living Organisms||Protochordata|
Protochordates are generally marine animals.
The organisms belonging to this group are bilaterally symmetrical.
They are triploblastic and have a coelom.
They have a long rod-like support structure called notochord at certain stages during their lives. The notochord is a runs along the back of the animal and separates the nervous tissue from the gut that gives a place for the muscles to attach for an easy and comfortable movement.
Examples of organisms belonging to this group are Balanoglossus, Herdmania and Amphioxus