- Protochordates are bilaterally symmetrical, triploblastic, and have a coelom. Notochord present at some stages during their lives.
- The notochord is a long rod like support struc¬ture that runs along the back of the animal separating the nervous tissue from the gut.
- Notochord provides a place for muscles to attach for ease of movement.
- Protochordates are marine animals.
Examples : Balanoglossus, Herdmania and Amphioxus.
