In biology a section (Latin: Sectio) is a taxonomic rank that is applied differently between botany and zoology.
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In botany
Within flora (plants), 'section' refers to a botanical rank below the genus, but above the species:
In zoology
Within fauna (animals), 'section' refers to a zoological rank below the order, but above the family:
In bacteriology
The International Code of Nomenclature for Bacteria states that the Section rank is an informal one, between the subgenus and species (as in botany).
References
Section (biology) Wikipedia(Text) CC BY-SA