Strain MBLB1234(T) was isolated from bentonite samples collected at Guryong mining area located in Pohang, Republic of Korea and was taxonomically characterized by a polyphasic approach. This strain was a Gram-stain-negative, motile, endospore-forming, facultative anaerobic, catalase-positive, oxidase-negative, and rod-shaped bacterium. Strain MBLB1234(T) was able to grow at 2045 degrees C (optimum, 37 degrees C), pH 6.010.0 (optimum, 7.0-8.0), and 05.0% (w/v) NaCl (optimum, 0.5%). Genome size was 6,497,679bp with a G+C content of 46.4mol%. The genome was predicted to contain 5233 protein-coding genes, and 135 rRNA genes consisted of 10 5S rRNAs, 10 16S rRNAs, 10 23S rRNAs, and 105 tRNAs. Phylogenetic analysis based on the 16S rRNA gene sequences revealed that strain MBLB1234(T) clustered with Paenibacillus motobuensis JCM 12774(T) and P. aceti JCM 31170(T) with 98.3-98.5% and 97.2-97.4% sequencing similarity, respectively. The major fatty acids of strain MBLB1234(T) were anteiso-C-15:0 (35.7%), anteiso-C-17:0 (17.8%), iso-C-17:0 (14.5%), and C-16:0 (11.0%). The polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylmethylethanolamine, and one unidentified phospholipid, six unidentified aminophospholipids, and one unidentified lipid. The predominant isoprenoid quinone was menaquinone-7. DNA-DNA hybridization values between strain MBLB1234(T) and P. motobuensis JCM 12774(T) and P. aceti JCM 31170(T) were 34 and 38%, respectively. Average nucleotide identity value between strains MBLB1234(T) and P. aceti L14(T) was 82.3%. Based on characteristics of genomic, phenotypic, chemotaxonomic, and phylogenetic analyses, strain MBLB1234(T) represents a novel species of the genus P. , for which the name P. lutimineralis sp. nov. is proposed. The type strain is MBLB1234(T) (=JCM 32684(T)=KCTC 33978(T)).