In biological classification, family (Latin: familia) is a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the prefix sub-: subfamily (Latin: subfamilia). a taxonomic unit, a taxon, in that rank. In that case the plural is families (Latin familiae). Example: Walnuts and hickories belong to Juglandaceae, the walnut family. What does and does not belong to each family is determined by a taxonomist. Similarly for the question if a particular family should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing a family. Some taxa are accepted almost universally, while others are recognised only rarely.
Created: 2019-06-24 10:13:25 CDT (-0500)
Last modified: 2019-06-24 10:13:25 CDT (-0500)