Phylum XIV. Bacteroidetes phyl. nov.

Abstract

Bac.te.ro.i.de′tes. N.L. fem. pl. n. Bacteroidales type order of the phylum; N.L. fem. pl. n. Bacteroidetes the phylum of Bacteroidales. The phylum Bacteroidetes is a phenotypically diverse group of Gram-stain-negative rods that do not form endospores. They are circumscribed for this volume on the basis of phylogenetic analysis of 16S rRNA gene sequences. The phylum contains four classes, Bacteroidia, Cytophagia, Flavobacteriia, and Sphin-gobacteria. In addition, the genera Rhodothermus, Salinibacter, and Thermonema appear to represent deep groups of the phylum that can not be readily assigned to any of the four classes. Type order: Bacteroidales ord. nov. Class I. Bacteroidia class. nov. Noel R. KRieg Bac.te.ro.i.di¢a. N.L. masc. n. Bacteroides type genus of the type order Bacteroidales; suff.-ia ending proposed by Gibbons and Murray and by Stackebrandt et al. to denote a class; N.L. neut. pl. n. Bacteroidia the Bacteroidales class. The class presently contains one order, Bacteroidales. The description of the class is the same as that given for the order. Type order: Bacteroidales ord. nov. Order I. Bacteroidales ord. nov. Noel R. KRieg Bac.te.ro.i.da¢les. N.L. masc. n. Bacteroides type genus of the order; suff.-ales ending to denote an order; N.L. fem. pl. n. Bacteroidales the Bacteroides order. The order presently includes the families Bacteroidaceae, Marini-labiliaceae, Porphyromonadaceae, Prevotellaceae, and Rikenellaceae. Straight, fusiform or thin rods and coccobacilli that stain Gram-negative. Nonsporeforming. Mostly anaerobic, although some are facultatively anaerobic, and saccharolytic, although proteins and other substrates may be utilized. Nonmotile or motile by gliding.