Question

What are Protochordates ? Give example.

Answer 1

Phylum Chordata is sub-divided into the sub-phyla protochordata and vertebrata based on the developmental features of the notochord.

Protochordata
This group includes animals that have a notochord. This feature may not be present at all stages of their life cycle. Further, the notochord may not run the entire length of a protochordate’s body. The word ‘proto’ means ‘primitive’. This indicates that protochordates are the ancestors of the modern-day chordates.

General features of protochordates

They are exclusively marine animals. They often live in burrows.
They show an organ system level of organization and are triploblastic.
The body cavity is enterocoelom.
The body of a protochordate is not segmented and is bilaterally symmetrical.
A notochord is present in some or all stages.
Examples of protochordates: Amphioxus, Herdmania, Balanoglossus
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Answer 2

Explanation:

Protochordates are an informal category of animals (i.e.: not a proper taxonomic group), named mainly for convenience to describe invertebrate animals that are closely related to vertebrates. This group is composed of the Phylum Hemichordata and the Subphyla Urochordata and Cephalochordata.