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Definition of Phyla:
(plu. of phylum) In classification, a primary grouping consisting of animals constructed on a similar general plan, and thought to be evolutionarily related. Examples: Porifera (Sponges), Platyhelminthes (flatworms, flukes and tapworms).[1].
This is the common definition for Phyla, other definitions can be discussed in the article


  1. Lawrence, E. (2005). Henderson’s dictionary of biology. Pearson Education Limited, 13th ed., Harlow. 748 p