Question

Contrasting characters of protochordata and urochordata

Answer 1

Chordates are known to have a notochord (either at a certain stage of life or throughout the lifespan).

Protochordates are the animals having a notochord at some stage or throughout the life. They have no vertebral column (i.e. an evolved notochord). They are further divided into two:

1.Urochordate

2.Cephalochordate

Urochodates have a notochord during their larval stage. However, they loose it during adulthood (due to metamorphosis). As they do not have a vetebral column and show the presence of notochord at a certain stage of life, they are included under protochordates.

Cephalochordates have a notochord throughout their lifespan. Therefore, known to be under protochordates.

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