Gracilicutes ( Latin: gracilis, slender, and cutis, skin, referring to the cell wall) is a controversial taxon in bacterial taxonomy.
gram staining results were most commonly used as a classification tool, consequently until the advent of molecular phylogeny, the Kingdom (as the domain Prokaryotae Bacteria was known then) was divided into four phyla, [1 ]
This classification system was abandoned in favour of the
three-domain system based on molecular phylogeny started by C. Woese. [3 ] [4 ]
This taxon was revived in 2006 by
Cavalier-Smith as an infrakindgom containing the phyla Spirochaetae, Sphingobacteria, Planctobacteria, and Proteobacteria. However, this taxon is not generally accepted and the three-domain system is followed. [5 ] [6 ]
It is a gram-negative clade that branched off from other bacteria just before the evolutionary loss of the outer membrane or
capsule, and just after the evolution of flagella. [5 ]
Relationships [ edit ]
The following graph shows
Cavalier-Smith's version of the tree of life, indicating the status of Gracilicutes. [7 ]
References [ edit ]
^ GIBBONS (N.E.) and MURRAY (R.G.E.): Proposals concerning the higher taxa of bacteria. International Journal of Systematic Bacteriology, 1978, 28, 1-6.
^ MURRAY (R.G.E.): The higher taxa, or, a place for everything...? In: N.R. KRIEG and J.G. HOLT (ed.) Bergey's Manual of Systematic Bacteriology, vol. 1, The Williams & Wilkins Co., Baltimore, 1984, p. 31-34
^ Woese, C. R. (1987). "Bacterial evolution". Microbiological reviews 51 (2): 221–271. PMC 373105. PMID 2439888.
^ Don J. Brenner, Noel R. Krieg, James T. Staley (July 26, 2005) [1984(Williams & Wilkins)]. George M. Garrity, ed. . Bergey's Manual of Systematic Bacteriology Introductory Essays 2A (2nd ed.). New York: Springer. p. 304. ISBN 978-0-387-24143-2. British Library no. GBA561951.
^ a b Cavalier-Smith T (2006). "Rooting the tree of life by transition analyses". Biol. Direct 1: 19. doi: 10.1186/1745-6150-1-19. PMC 1586193. PMID 16834776.
^ Krieg, N.R.; Ludwig, W.; Whitman, W.B.; Hedlund, B.P.; Paster, B.J.; Staley, J.T.; Ward, N.; Brown, D.; Parte, A. (November 24, 2010) [1984(Williams & Wilkins)]. George M. Garrity, ed. . Bergey's Manual of Systematic Bacteriology The Bacteroidetes, Spirochaetes, Tenericutes (Mollicutes), Acidobacteria, Fibrobacteres, Fusobacteria, Dictyoglomi, Gemmatimonadetes, Lentisphaerae, Verrucomicrobia, Chlamydiae, and Planctomycetes 4 (2nd ed.). New York: Springer. p. 908. ISBN 978-0-387-95042-6. British Library no. GBA561951.
^ Cavalier-Smith T (2006). "Cell evolution and Earth history: stasis and revolution". Philos Trans R Soc Lond B Biol Sci 361 (1470): 969–1006. doi: 10.1098/rstb.2006.1842. PMC 1578732. PMID 16754610.