Many factors, such as the type of coelom, symmetry, body plan, and existence of segmentation, are used to classify the various animal phyla. Sponges (Porifera) lack tissues and symmetry and exhibit a basic cellular level of organization.
Porifera, Coelenterata, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata, and Chordata are divisions of the animal kingdom.
Based on the existence or lack of a notochord, the animal kingdom has been roughly divided into two groups: Chordata and Non-Chordata. Non-chordates lack the notochord, whereas chordates have one. Non-chordates are creatures from the Phyla Porifera and Phyla Echinoderms.
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