Class 11 Biology Animal Kingdom Phylum Arthropoda

Phylum Arthropoda

  • Phylum Arthropoda is the largest phylum of Animalia which includes insects.
  • They have organ-system level of organization, they are bilaterally symmetrical, triploblastic, segmented and coelomate animals.
  • The body is covered by chitinous exoskeleton.
  • The body consists of head, thorax and abdomen and have jointed appendages.
  • Respiratory organs are gills, book gills, book lungs or tracheal system.
  • Circulatory system is of open type, sensory organs like antennae, eyes, statocysts are present, and excretion takes place through Malpighian tubules.
  • They are mostly dioecious, fertilization is internal, mostly oviparous, and development may be direct or indirect.


Economically important insects – Apis (Honey bee), Bombyx (Silkworm).


Vectors – Anopheles, Culex mosquito.


Living fossil – Limulus (King crab).


Gregarious pest – Locusta (Locust)


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