Kingdom (biology)

Kingdom is the highest rank, after the domain, which is normally used in the biological taxonomy of all organisms. Each kingdom is split into phyla.

There are 5 or 6 kingdoms in taxonomy. Every living thing comes under one of these kingdoms and some symbionts, such as lichen, come under two. There are at least:

Overview

Template:Full biological kingdom classification The kingdom-level classification of life is still widely employed as a useful way of grouping organisms. Sometimes entries in the table, which are next to each other, do not match perfectly. For example, Haeckel placed the red algae (Haeckel's Florideae; modern Rhodophyta) and blue-green algae (Haeckel's Archephyta; modern Cyanobacteria) in his Plantae, but in modern classifications they are considered protists and bacteria respectively. However, despite these differences, the table gives a useful summary.

  • There is no agreement at present on how many kingdoms there are in the Eukarya. In 2009, Andrew Roger and Alastair Simpson said this: "With the current pace of change in our understanding of the eukaryote tree of life, we should proceed with caution".[1]

Related pages

References

  1. Roger, A.J. & Simpson, A.G.B. (2009), "Evolution: Revisiting the root of the eukaryote tree", Current Biology, 19 (4): R165–7, doi:10.1016/j.cub.2008.12.032, PMID 19243692