sp. nov., sp. nov. and sp. nov., three cellulolytic bacteria isolated from intestinal contents of .

Six facultative anaerobic, Gram-stain-positive, oxidase-negative, rod-shaped bacteria (strains zg-B89, zg-B12, zg-Y338, zg-Y138, zg-Y908 and zg-Y766), were isolated from the intestinal contents of in Qinghai Province, PR China. The 16S rRNA gene sequence analysis showed that zg-B89 showed highest similarity to NBRC 101100 (99.5 %), zg-Y338 to DSM 20118 (98.7 %), and zg-Y908 to DSM 20109 (99.0 %). Phylogenetic and phylogenomic analysis based on 16S rRNA gene and 881 core genes revealed that these six strains formed three separate clades in the genus . Average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values between these three novel species and all members of the genus were below species thresholds (95-96 % for ANI and 70 % for dDDH). The DNA G+C contents of zg-B89, zg-Y338 and zg-Y908 were 73.6, 72.9 and 74.5 %, respectively. Strains zg-B89 and zg-Y908 had anteiso-C, C and anteiso-C A, and zg-Y338 had anteiso-C, C and iso-C as the main fatty acids. All novel type strains had MK-9 (H) as the predominant respiratory quinone, diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and phosphatidylinositol mannoside as the major polar lipids, and rhamnose, ribose and glucose as the cell-wall sugars. The peptidoglycan amino acids of zg-B89, zg-Y338 and zg-Y908 contained ornithine, alanine, glutamic acid and aspartic acid (except for zg-Y338). Based on genotypic, phenotypic, phylogenetic and biochemical properties, the six uncharacterized strains represent three novel species in the genus , for which the names sp. nov. (type strain zg-B89=GDMCC 1.2821=KCTC 49756), sp. nov. (type strain zg-Y338=GDMCC 1.2829=KCTC 49754) and sp. nov. (type strain zg-Y908=GDMCC 1.2820=KCTC 49755) are proposed, respectively.