Class 11 Biology Animal Kingdom Phylum Hemichordata

Phylum Hemichordata

  • Phylum hemichordata consists of a small group of worm-like marine animals.
  • They have organ-system level of organization, bilaterally symmetrical, triploblastic and coelomate animals.
  • The body is cylindrical and is composed of an anterior proboscis, a collar and a long trunk.
  • Circulatory system is of open type, respiration takes place through gills and excretory organ is proboscis gland.
  • Sexes are separate, fertilization is external and development is indirect.


Example- Balanoglossus and Saccoglossus.

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