Kingdom Animalia has been classified into 11 major phylums.

These are:

1. Phylum Porifera: These are the simplest, multicellular, diploblastic, asymmetrical or radially symmetrical animals.

Example: Sycon.

2. Phylum Cnidaria or Coelenterata: These are diploblastic, radially symmetrical organisms with tissue level of organisation.

Example: Hydra.

3. Phylum Ctenophora: They are bilaterally symmetrical, triploblastic animals with eight longitudinal rows of ciliary comb-plates for locomotion.

Example: Pleurobrachia.

4. Phylum Platyhelminthes: They are bilaterally symmetrical, triploblastic, acoelomate and hermaphrodite animals.

Example: Taenia solium.

5. Phylum Nematoda: They are bilaterally symmetrical, triploblastic, pseudocoelomate and unsegmented animals.

Example: Ascaris.

6. Phylum Annelida: They are bilaterally symmetrical, triploblastic, true coelomate animals.

Example: Hirudinaria.

7. Phylum Arthropoda: They are triploblastic, bilaterally symmetrical, haemocoelomate animals with metamerically segmented body.

Example: Palaemon.

8. Phylum Mollusca: They are bilaterally symmetrical, haemocoelomate animals with little segmentation.

Example: Chiton.

9. Phylum Echinodermata: They are triploblastic, coelomate, radially symmetrical animals with spiny hard calcareous endoskeleton.

Example: Antedon.

10. Phylum Hemichordata: They are bilaterally symmetrical animals with unsegmented body and have gill slits for respiration.

Example: Balanoglossus.

11. Phylum Chordata: They possess dorsal, hollow, tubular nerve cord with a presence of notochord and paired gill-slits in the pharynx.

Example: Herdmania.