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Garrity, G.M., Winters, M., Kuo, A.W. & Searles, D.B. 2002. Taxonomic Outline of the Procaryotes. Bergey's Manual of Systematic Bacteriology, Second Edition. Release 2.0. Springer-Verlag, New York/Berlin/Heidelberg, Jan 2002: 1-348. ["New taxa (recently added) are highlighted in red type"] ≡