- International Journal of Systematic and Evolutionary Microbiology
- Volume 47, Issue 2
f Proposal for a New Hierarchic Classification System, Actinobacteria classis nov.
- Authors: ERKO STACKEBRANDT*, FRED A. RAINEY, NAOMI L. WARD-RAINEY
- * Corresponding author. Mailing address: DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg lb, 38124 Soanschweig, Germany. Phone: 49 531 2616 352. Fax: 49 531 2616 418. E-mail: email@example.com.
- First Published Online: 01 April 1997, International Journal of Systematic and Evolutionary Microbiology 47: 479-491, doi: 10.1099/00207713-47-2-479
- Subject: Original Papers Relating To Systematic Bacteriology
- Issue Published:
A new hierarchic classification structure for the taxa between the taxonomic levels of genus and class is Proposed for the actinomycete line of descent as defined by analysis of small subunit (16S) rRNA and genes coding for this molecule (rDNA). While the traditional circumscription of a genus of the actinomycete subphylum is by and large in accord with the 16S rRNA/rDNA-based phylogenetic clustering of these organisms. most of the higher taxa proposed in the past do not take into account the phylogenetic clustering of genera. The rich chemical, morphological and physiological diversity of phylogenetically closely related genera makes the description of families and higher taxa so broad that they become meaningless for the description of the enclosed taxa. Here we present a classification system in which phylogenetically neighboring taxa at the genus level are clustered into families, suborders, orders, subclasses, and a class irrespective of those phenotypec characteristics on which the delineation of taxa has been based in the past. Rather than being based on a listing of a wide array of chemotaxonomic, morphological, and physiological properties, the delineation is based solely on 16S rDNA/rRNA sequence-based phylogenetic clustering and the presence of taxon-specific 16S rDNA RNA signature nucleotides.
Copyright © 1997 International Union of Microbiological Societies | Published by the Microbiology Society
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