A Gram-stain-negative, motile, rod-shaped, cellulose-degrading bacterial strain, BIO-TAS4-2(T), which belongs to the Betaproteobacteria , was isolated from forest soil from Naejang Mountain, Korea, and its taxonomic position was investigated by using a polyphasic study. Strain BIO-TAS4-2(T) grew optimally at pH 7.0-8.0, at 30 degrees C and in the presence of 0-1.0 % (w/v) NaCl. Phylogenetic trees based on 16S rRNA gene sequences showed that strain BIO-TAS4-2(T) clustered with members of the genera Andreprevotia, Silvimonas and Deefgea of the family Neisseriaceae, with which it exhibited 16S rRNA gene sequence similarities of 93.5-94.2 %. Strain BIO-TAS4-2(T) contained Q-8 as the predominant ubiquinone and summed feature 3 (C(16 : 1)omega7c and/or iso-C(15 : 0) 2-OH) and C(16 : 0) as the major fatty acids. The DNA G+C content was 63.8 mol%. Strain BIO-TAS4-2(T) could be differentiated from members of phylogenetically related genera by differences in fatty acid composition, DNA G+C content and some phenotypic properties. On the basis of phenotypic, chemotaxonomic and phylogenetic data, strain BIO-TAS4-2(T) is considered to represent a novel species in a new genus, for which the name Jeongeupia naejangsanensis gen. nov., sp. nov. is proposed, with BIO-TAS4-2(T) (=KCTC 22633(T)=CCUG 57610(T)) as the type strain.