The heirachy of biological classification's eight major taxonomic ranks. Intermediate minor rankings are not shown.

In biology, a phylum (plural: phyla) is a taxonomic rank below kingdom and above class. "Phylum" is equivalent to the botanical term division.[1] Phylum is one of the major biological divisions called Taxa. Although "phylum" is often used as if it were a clearly defined term, no satisfactory definition of it exists.


  1. Retrieved 2008-10-04. Life sciences. The American Heritage New Dictionary of Cultural Literacy (third ed.). Houghton Mifflin Company. 2005. "Phyla in the plant kingdom are frequently called divisions."
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