Question

characteristics of phylum hemichordata

Answer 1

Hii

Characteristic Features of Phylum 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.

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.

Body is divided into three regions – Proboscis, Collar and Trunk.

Circulatory system in open type.

Respiration occurs through gills.

The proboscis has a glomerulus, which is the excretory organ.

A primitive nervous system is present.

Sexes are separate or united.

Reproduction is mostly sexual reproduction.

Fertilization is external.

Development is mostly indirect. But a few species exhibit direct development.

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Answer 2

Answer :

Phylum Hemichordata :-

• The phylum hemichordata was considered as a subphylum under chordata previously.
• Now, it has been made a separate phylum including organisms which are worm like.
• These organisms are marine.
• They have organ system level of organisation.
• They are bilaterally symmetrical.
• They are triploblastic.
• They are coelomate animals.
• Their body is cylindrical.
• Their body is composed of anterior proboscis, a collar and a long trunk.
• The circulatory system of these organisms is open.
• The excretory organ is proboscis gland.
• They have separate sexes.
• The respiration in this organisation takes place through gills.
• The fertilization is external and the development is indirect.
• Example includes Balanglossus and Saccogloccus.