Basics of Protochordates

Protochordata forms the first group of animals in the animal kingdom that possess notochord.

Protochordata is a group under phylum Chordata.

Chordata has been further classified into two groups: 1) Protochordata 2) Vertebrata

Phylum Chordata comprises animals that have notochord at any stage of their life cycle.

The notochord is a long rod-like support structure that runs along the back of the animal separating the nervous tissue from the gut.

Notochord provides a place for muscles to attach and allow them to move easily.

Let us find out more about protochordates.

Proto means 'first formed', so it is the group that comprises the 'first formed chordates'.

All the protochordates are marine organisms.

All the protochordates are triploblastic, having presence of three germ layers - ectoderm, endoderm and mesoderm.

Protochordates have true body cavity or coelom.

All the animals of protochordata are bilaterally symmetrical.

Protochordates have organ system level of organization.

Chordate characters like pharyngeal gill slits, dorsal hollow nerve chord and post anal tail are also observed in protochordates.

Notochord is present at some stage during their lives.

has notochord in the larval stage where as has notochord throughout its life.

, , , are few examples of protochordates.

Revision

Protochordates possess notochord at some stage during their lives.

Protochordates are: 1) triploblastic 2) bilaterally symmetrical 3) have organ-system level organization 4) have coelom

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