Class 11 Biology Animal Kingdom Phylum Aschelminthes

Phylum Aschelminthes

  • The body of the aschelminthes is circular in cross-section, hence, the name roundworms.
  • Roundworms have organ-system level of body organization, bilaterally symmetrical, they are triploblastic and pseudocoelomate animals.
  • Alimentary canal is complete with a well-developed muscular pharynx.
  • An excretory tube removes body wastes through the excretory pore.
  • They are dioecious, but often females are longer than males.
  • Fertilization is internal and development may be direct or indirect.

Examples- Ascaris (Round worm), Wuchereria (Filaria worm).


Fig. Round worm

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