Phyla

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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

References

  1. Lawrence E. and Henderson W. D. (2005), Henderson’s dictionary of biology, Eleanor Lawrence. 748 p.