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A bacterial strain, designated GAU11T, was isolated from soil in Japan. Cells of the strain were Gram-stain-negative, aerobic, non-motile rods. The 16S rRNA gene sequence of strain GAU11T showed high similarity to those of Comamonas zonglianii BF-3T (98.8 %), Pseudacidovorax intermedius CC21T (96.4 %), Acidovorax caeni R-24608T (96.2 %), Alicycliphilus denitrificans K601T (96.2 %), Pseudorhodoferax soli TBEA3T (95.9 %) and Comamonas terrigena LMG 1253T (95.9 %). Strain GAU11T contained ubiquinone 8 as the sole ubiquinone and diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylglycerol as major polar lipids. Its major cellular fatty acids were C16 : 0, C18 : 1ω7c and summed feature 3 (C16 : 1ω7c and/or iso-C15 : 0 2-OH). The DNA G+C content of strain GAU11T was 68.2 mol%. The DNA–DNA relatedness between strain GAU11T and C. zonglianii DSM 22523T was 52 or 68 % (reciprocal value). Phenotypic characterization indicated that strain GAU11T represents a member of the genus Comamonas , but at the same time distinguished it from C. zonglianii DSM 22523T. From polyphasic characterization, this strain should be classified as representing a novel species of the genus Comamonas , for which the name Comamonas humi sp. nov. (type strain GAU11T = JCM 19903T = DSM 28451T) is proposed.
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