Question

Discuss the affinities, ancestry and evolution of hemichordates and protochordates. Answer

Answer 1

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Characteristic Features of Phylum Hemichordata. Hemichordata have a true body cavity or coelom. The digestive tract is complete with an anus and can be in the form of a U shaped tube or straight. A buccal diverticulum is present in the proboscis

Answer 2

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Characteristic Features of Hemichordata

• Hemichordata is bilaterally symmetrical and triploblastic animal.
• They are exclusively marine animals.
• They can be solitary or in colonies.
• Hemichordata have a true body cavity or coelom.

Characteristics of Protochordata

• They are generally found in marine water.
• Their body is bilaterally symmetrical, triploblastic, and coelomated.
• At a certain stage of their lives, their body develops a long, rod-like structure for support called the notochord.
• They exhibit organ system level of organization.

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