Phylogeny and genomic analysis of Shewanella cutis sp. nov., isolated from freshwater pufferfish

Three closely related, aerobic, Gram-stain-negative, motile, rod-shaped bacterial strains (PS-2T, PS-17, and PS-19) were isolated from the skin of freshwater pufferfish (Tetraodon cutcutia). Colonies are pinkish-colored. The optimum growth occurred at 28-30 °C, and the pH was 6.5-7. The major cellular fatty acids were C16:1 ω7c, iso-C15.0, C17:1 ω8c, C18:1 ω7c, and C16:0. The predominant polar lipids were phosphatidylglycerol, phosphatidylethanolamine, and amino lipids. The genome size of strain PS-2T is 4.8 Mbp, and the G + C content was 46.0%. The major fraction of genes were associated with biological processes (45.64%), followed by molecular function (29.86%) and cellular components (24.49%). The unique genes identified in strain PS-2T secreted cyanophycinase, UDP-N-acetylglucosamine 2-epimerase, methyltransferase, kynureninase, ADA regulatory protein, biphenyl degradation, thermostable carboxypeptidase 1, tetrathionate respiration, etc. In addition, alanine and glutamate racemases were present. The 16S rRNA gene sequences shared 98.83-99.24% similarity with the closely related type strains of Shewanella. The ANI and AAI of strain PS-2T with reference type strains of the genus Shewanella were below 95-96%, and the corresponding dDDH values were below 70%. A phylogenetic tree based on 16S rRNA gene sequences and genome-wide core genes revealed that strain PS-2T clustered with Shewanella oneidensis LMG 19005T in both phylogenetic trees. Based on the polyphasic analysis, the new isolates (PS-2T, PS-17, and PS-19) represent a novel species of Shewanella, for which Shewanella cutis sp. nov. is proposed. The type strain is PS-2T (= TBRC 15838T = NBRC 115342T).

Genome analysis deciphered Chryseobacterium indicum is a distinct species associated with freshwater pufferfish

A bacterium, strain PS-8T of the genus Chryseobacterium, was isolated from the skin of freshwater pufferfish (Tetraodon cutcutia). Strain PS-8T is a Gram-negative, aerobic, non-motile, and rod-shaped bacterium. Colonies appear in yellowish-orange colors. The major cellular fatty acids were C15:0 iso, C17:0 iso 3OH, C15:0 iso 3OH, and C11:0 anteiso. The predominant polar lipids were phosphatidylethanolamine and amino lipids. The genome size is 4.83 Mb. The G + C content was 35.6%. The in silico dDDH homology, ANI, and AAI were below the cutoff value, 70% and 95% to 96%, respectively, suggesting that strain PS-8T represents a defined species. The phylogenetic tree based on core and the non-recombinant genes showed the strain PS-8T clustered with Chryseobacterium gambrini DSM 18014T. Genome-wide analysis decodes several virulence factors of the genus Chryseobacterium, including genes for adherence, biofilm and stability, proliferation, resistance to immune response, and host-defense evasion system. The cladogram of the virulence genes showed a phylogenetic relationship among the Chryseobacterium species. Knowledge of the association of Chryseobacterium with freshwater pufferfish adds a new ecological niche to this bacterium.

Marinomonas transparens sp. nov. and Marinomonas sargassi sp. nov., isolated from marine alga

Two Gram-stain-negative, rod-shaped, non-spore-forming, strictly aerobic, motile bacteria with a single polar flagellum, designated strains C1424T and C2222T, were isolated from marine alga collected from the sea shore at Yantai, PR China. Strain C1424T grew at 4-37 °C and in the presence of 1-9 % (w/v) NaCl, while strain C2222T grew at 4-32 °C with 1-6 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences and concatenated amino acid sequences of 120 ubiquitous single-copy proteins showed that both strains C1424T and C2222T belonged to the genus Marinomonas, showing highest 16S rRNA gene sequence similarities to the type strains of Marinomonas primoryensis (98.1 %) and Marinomonas dokdonensis (98.1 %), respectively. The major fatty acids of the two strains were C18 : 1  ω6c and/or C18 : 1  ω7c, C16 : 1  ω6c and/or C16 : 1  ω7c and C16 : 0, their predominant polar lipids were phosphatidylethanolamine and phosphatidylglycerol, and their sole respiratory quinone was Q8. On the basis of polyphasic analyses, strains C1424T and C2222T are considered to represent two novel species within the genus Marinomonas, for which the names Marinomonas transparens sp. nov. and Marinomonas sargassi sp. nov. are proposed. The type strains are C1424T (=KCTC 72119T=MCCC 1K03601T) and C2222T (=KCTC 72120T=MCCC 1K03602T), respectively.

Phylogeny and structural insights of lipase from Halopseudomonas maritima sp. nov., isolated from sea sand

A Gram-negative, aerobic bacterial strain RR6T was isolated from the sea sand to produce lipase and proposed as a novel species of Halopseudomonas. The optimum growth occurred at 28-37 °C, and the pH was 6.0-8.0. The optimum growth occurred at 3.0 -6.5% (w/v) NaCl. The major cellular fatty acids were C10:0 3OH, C12:0, C16:1 ω7c/16:1 ω6c, 18:1 ω7c and/or 18:1 ω6c, and C16:0. The predominant polar lipids were phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, unidentified phospholipid, and unidentified lipids. The genome is 3.93 Mb, and the G + C content is 61.3%. The 16S rRNA gene sequences shared 99.73-99.87% sequence similarity with the closely related type strains of Halopseudomonas. The average nucleotide identity and average amino acid identity of strain RR6T with reference type strains were below 95-96%, and the corresponding in-silico DNA-DNA hybridization values were below 70%. Strain RR6T clustered with Halopseudomonas gallaeciensis V113T and Halopseudomonas pachastrellae CCUG 46540 T in the phylogenetic tree. Further, lipase produced by this bacterium belongs to α/β hydrolase lipase family and exhibits structural similarity to the lactonizing lipase. Based on the polyphasic analysis, the new isolates RR6T represent a novel species of Halopseudomonas for which Halopseudomonas maritima sp. nov. is proposed. The type strain is RR6T (= NBRC 115418 T = TBRC 15628 T).

Moraxella tetraodonis sp. nov., isolated from freshwater pufferfish (Tetraodon cutcutia) skin

A novel aerobic bacterium, strain PS-22 of the genus Moraxella, was isolated from the skin of freshwater pufferfish (Tetraodon cutcutia). Cells were Gram stain negative, aerobic, non-motile, and coccoid. Optimum growth occurred at 28-30 °C and pH 6.5-7.5. The major cellular fatty acids were C_18:1 ω9c, C_10:0, C_16:0, and C_12:0 anteiso. The predominant polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phospholipid, amino lipid, and seven unknown lipids. The genome size is 2.68 Mbp, and the DNA G + C content was 43.3%. A gene ontology study revealed that the major fraction of genes were associated with biological processes (46.81%), followed by molecular function (34.27%) and cellular components (18.8%). Comparisons of 16S rRNA gene sequences revealed 99.11-90% sequence similarity with the closely related type strains of the genus Moraxella. The average nucleotide identity (ANI) and average amino acid identity (AAI) of strain PS-22 with reference type strains of the genus Moraxella were below 95-96%, and the corresponding in silico DNA-DNA hybridization (DDH) values were below 70%. A phylogenetic tree based on genome-wide core genes and 16S rRNA gene sequences revealed that strain PS-22 clustered with Moraxella osloensis CCUG350^T in both the phylogenetic trees. Genotypic and phenotypic characteristics of strain PS-22 represent a novel species for which Moraxella tetraodonis sp. nov. is proposed. The type strain is PS-22^T (= TBRC 15232^T = NBRC 115236^T).

Marinomonas lutimaris sp. nov., isolated from a tidal flat sediment of the East China Sea

A Gram-stain-negative bacterial strain, designated as E165T, was isolated from a tidal flat sediment of the East China Sea. Strain E165T grew optimally at pH 6, at 32 °C and with 1–2 % (w/v) NaCl. The 16S rRNA gene sequence similarity results revealed that strain E165T was most closely related to Marinomonas rhizomae IVIA-Po-145T, Marinomonas polaris CK13T, Marinomonas foliarum IVIA-Po-155T, Marinomonas hwangdonensis HDW-15T, Marinomonas pontica 46-16T, Marinomonas mangrovi B20-1T and Marinomonas shanghaiensis DSL-35T with values of 97.0–98.5 %. The digital DNA–DNA hybridization and average nucleotide identity values between strain E165T and the reference strains were 21.9–34.3 % and 77.6–87.3 %, respectively. The DNA G+C content of the isolate was 42.9 mol%. Strain E165T contained Q-8 as the sole ubiquinone and C16 : 0, summed feature 8 (C18 : 1  ω7c and/or C18 : 1  ω6c) and summed feature 3 (C16 : 1  ω7c and/or C16 : 1  ω6c) as the major fatty acids. The major polar lipids of strain E165T were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, aminolipid and aminophospholipid. On the basis of phenotypic characteristics, phylogenetic analysis and DNA–DNA relatedness, a novel species, Marinomonas lutimaris sp. nov., is proposed with E165T (=MCCC 1K06241T=KCTC 82809T) as the type strain.

Marinomonas profundi sp. nov., isolated from deep seawater of the Mariana Trench

A Gram-stain-negative, aerobic, polarly flagellated, straight or curved rod-shaped bacterium, designated strain M1K-6^T, was isolated from deep seawater samples collected from the Mariana Trench. The strain grew at -4 to 37 °C (optimum, 25-30 °C), at pH 5.5-10.0 (optimum, pH 7.0) and with 0.5-14.0  % (w/v) NaCl (optimum, 2.0 %). It did not reduce nitrate to nitrite nor hydrolyse gelatin or starch. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain M1K-6^T was affiliated with the genus Marinomonas, sharing 93.1-97.0  % sequence similarity with the type strains of recognized Marinomonas species. The major cellular fatty acids were summed feature 3 (C_16 : 1 ω6c/C_16 : 1 ω7c), summed feature 8 (C_18 : 1 ω7c/C_18 : 1 ω6c), C_16 : 0, C_10 : 0 3-OH and C_18 : 0. The predominant respiratory quinone was ubiquinone-8. Polar lipids of strain M1K-6^T included phosphatidylethanolamine, phosphatidylglycerol and two unidentified lipids. The genomic G+C content of strain M1K-6^T was 46.0 mol%. Based on data from the present polyphasic study, strain M1K-6^T was considered to represent a novel species within the genus Marinomonas, for which the name Marinomonas profundi sp. nov. is proposed. The type strain is M1K-6^T (=KCTC 72501^T=MCCC 1K03890^T).

Marinomonas epiphytica sp. nov., isolated from a marine intertidal macroalga

A novel Gram-stain-negative, aerobic marine bacterial strain, SAB-3T, was isolated from brown macroalgae (Dictyota sp.) growing in the Arabian sea, Goa, India. The strain grew optimally at 30 °C, with 2.0-4.0 % (w/v) NaCl and at pH 7.0 on marine agar medium. Strain SAB-3T was unable to hydrolyse aesculin and did not grow in the presence of rifamycin but showed resistance to antibiotics such as cefadroxil and co-trimoxazole. The major fatty acids were summed feature 8 (C18 : 1ω7c/C18 : 1ω6c), summed feature 3 (C16 : 1ω7c/C16 : 1ω6c) and C16 : 0, and Q-8 was the major ubiquinone. The major polar lipids were phosphatidylglycerol and phosphatidylethanolamine. The DNA G+C content was 41.0 mol%. 16S rRNA gene sequencing and phylogenetic analysis indicated that the strain was a member of the genus Marinomonas with Marinomonas aquiplantarum IVIA-Po-159T (97.6 % similarity), Marinomonas posidonica IVIA-Po-181T (97.5 %) and Marinomonas dokdonensis DSM 17202T (97.4 %) as the closest relatives. Whole genome relatedness determined through DNA-DNA hybridization revealed values of 40-50 % (below the 70 % threshold recommended for species delineation) with the above three species, thus confirming it as representing a distinct and novel species of the genus Marinomonas for which the name Marinomonas epiphytica sp. nov. is proposed. The type strain is SAB-3T (=JCM 31365T=KCTC 52293T=MTCC 12569T).

Idiomarina andamanensis sp. nov., an alkalitolerant bacterium isolated from Andaman Sea water

Two closely related aerobic, Gram-negative rod shaped bacteria (strain W5^T and W3) were isolated from Andaman Sea. Heterotrophic growth on marine agar was observed at 15-45 °C and pH 6-10. Strain W5^T showed maximum 16S rRNA sequence similarity of 99.58% with Idiomarina marina JCM 15083^T. DNA fingerprinting analysis by ERIC-REP PCR, PFGE and MLSA revealed differences in banding patterns, also DNA-DNA hybridization values were well below 70% confirming W5^T to be a new species. DNA G+C content was 46.7 mol%. Major fatty acids were iso-C15:0, iso-C17:0, iso-C17:1 ω9c, iso-C13:0 3OH, iso-C11:0 3OH and C16:0. Polar lipids included phosphatidylglycerol (PG) and phosphatidylethanolamine (PE) diphosphatidylglycerol (DPG) phospholipid (PL) two aminolipids (AL) and two unidentified lipids (L1-2). Q-8 is the predominant ubiquinone. On the basis of polyphasic taxonomic study, strain W5^T is considered to be representative of a new species of the genus Idiomarina, for which the name Idiomarina andamanensis sp. nov. is being proposed. The type strain W5^T (= LMG 29773^T = JCM 31645^T) was isolated from Andaman Sea.

Marinomonas blandensis sp. nov., a novel marine gammaproteobacterium

A novel Gram-staining-negative, chemoorganotrophic, moderately halophilic, strictly aerobic bacterium, strain MED121T, was isolated from a seawater sample collected at the Blanes Bay Microbial Observatory in the north-western Mediterranean Sea. Analysis of its 16S rRNA gene sequence, retrieved from the whole-genome sequence, showed that this bacterium was most closely related to Marinomonas dokdonensis and other Marinomonas species (96.3 and 93.3-95.7 % sequence similarities, respectively), within the family Oceanospirillaceae. Strain MED121T was included into a whole-genome sequencing study and, subsequently, it was characterized using a polyphasic taxonomic approach. It was found to be oxidase and catalase positive, its cells are cocci to short rods, it does not ferment carbohydrates and does not reduce nitrate to nitrite or gas and it requires at least 2.5 % (w/v) marine salts and tolerates up to 7 % (w/v) salts. Its major cellular fatty acids in order of abundance are C16 : 1ω7c/C16 : 1ω6c, C18 : 1ω7c, C16 : 0 and C10 : 0 3-OH. Its genome had an approximate length of 5.1 million bases and a DNA G+C content equal to 40.9 mol%. Analysis of the annotated genes reveals the capacity for the synthesis of ubiquinone 8 (Q8) and the polar lipids phosphatidylglycerol and phosphatidylethanolamine, in agreement with other members of the genus. All the data collected supported the creation of a novel species to accommodate this bacterium, for which the name Marinomonas blandensis sp. nov. is proposed. The type strain is MED121T (=CECT 7076T=LMG 29722T).

Sulfitobacter faviae sp. nov., isolated from the coral Faviaveroni

Three closely related, non-sporulating, aerobic, Gram-stain-negative, motile, rod-shaped isolates (S5-53T, S6-62 and S6-64) were obtained from mucus of corals Favia veroni from the Andaman Sea, India. Colonies grown on marine agar were small, circular and cream-coloured. Heterotrophic growth was observed at 10-40 °C and pH 6-10; optimum growth occurred at 25-30 °C and pH 7-8. 16S rRNA gene sequence analysis confirmed the isolates belonged to the genus Sulfitobacter and the three isolates shared more than 99 % pairwise sequence similarity. Strain S5-53T shared highest 16S rRNA gene sequence similarity of 98.43 % with Sulfitobacter dubius KMM 3554T. DNA-DNA relatedness among the three isolates was above 70 % whereas strain S5-53T showed less than 70 % relatedness with the type strains of closely related species. The DNA G+C content of strain S5-53T was 61 mol%. It contained phosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine and diphosphatidylglycerol as major polar lipids. Predominant fatty acids included C18 : 1ω7c, C18 : 1ω7c 11-methyl, C16 : 0 and C10 : 0 3-OH. Q10 was the major respiratory quinone. Based on this polyphasic analysis, the new isolates (S5-53T, S6-62 and S6-64) are considered to represent a novel species of the genus Sulfitobacter, for which the name Sulfitobacter faviae sp. nov. is proposed. The type strain is S5-53T(=JCM 31093T=LMG 29156T).

Marinomonas spartinae sp. nov., a novel species with plant-beneficial properties

Two strains of Gram-stain-negative, chemo-organotrophic, aerobic and halophilic gammaproteobacteria, isolated from within the stem and roots of Spartina maritima in salt marshes from the south Atlantic Spanish coast, were found to represent a novel species in the genus Marinomonas through phylogenetic analysis of their 16S rRNA genes and phenotypic characterization. 16S rRNA gene sequences of the two strains shared < 96.2% similarity with other Marinomonas species, with Marimonas alcarazii being the most similar in sequence. They required sodium ions for growth, were able to thrive at low (4 °C) temperatures and at salinities of 12-15%, were unable to hydrolyse any tested macromolecule except casein, and grew with different monosaccharides, disaccharides, sugar alcohols, organic acids and amino acids. The novel species differed from other Marinomonas species in the use of several sole carbon sources, its temperature and salinity ranges for growth, ion requirements and cellular fatty acid composition, which included C16:0, C16:1 and C18:1 as major components and C10:0 3-OH, C12:0 and C12:0 3-OH as minor components. The name Marinomonas spartinae sp. nov. is proposed, with SMJ19T (=CECT 8886T=KCTC 42958T) as the type strain.

Marinomonas mangrovi sp. nov., isolated from mangrove sediment

A Gram-stain-negative, Na+-requiring bacterial strain, designated B20-1T, was isolated from soil of the root system of mangrove forest. Cells were curved rods and motile by means of a polar flagellum. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain B20-1T belonged to the genus Marinomonas , sharing highest sequence similarities with Marinomonas rhizomae IVIA-Po-145T (97.6 %), Marinomonas dokdonensis DSW10-10T (97.0 %) and Marinomonas foliarum IVIA-Po-155T (96.9 %). The predominant cellular fatty acids of strain B20-1T were C10 : 0 3-OH, C18 : 1ω7c, summed feature 3 (C16 : 1ω7c and/or iso-C15 : 0 2-OH) and C16 : 0. Phosphatidylethanolamine and phosphatidylglycerol were identified as the predominant phospholipids. The predominant ubiquinone was Q-8. The genomic DNA G+C content of strain B20-1T was 46.6 mol%. On the basis of phenotypic characteristics, phylogenetic analysis and DNA–DNA relatedness, a novel species, Marinomonas mangrovi sp. nov., is proposed with B20-1T ( = DSM 28136T = LMG 28077T) as the type strain.

Marinomonas fungiae sp. nov., isolated from the coral Fungia echinata from the Andaman Sea

A novel aerobic marine bacterium, strain AN44T, was isolated from the coral Fungia echinata sampled from the Andaman Sea, India. Cells were Gram-negative, motile and rod-shaped. Oxidase and catalase tests were positive. Heterotrophic growth was observed at pH 5.5–10 and at 16–42 °C, with optimum growth at pH 7–8 and 28 °C. Strain AN44T grew in the presence of 0.5–11 % (w/v) NaCl; the optimal NaCl concentration for growth was 3–5 %. The DNA G+C content was 47.8 mol%. Predominant cellular fatty acids of strain AN44T were C18 : 1ω7c, C16 : 1ω7c/C16 : 1ω6c, C16 : 0, C10 : 0 3-OH, C12 : 0, C10 : 0, C14 : 0 and C18 : 0. The sole isoprenoid ubiquinone was Q-8. The polar lipids were an unidentified phospholipid, an unidentified aminophospholipid and two unidentified glycolipids. 16S rRNA gene sequence comparisons revealed that strain AN44T clustered within the radiation of the genus Marinomonas and showed similarity of 97.9 % with Marinomonas ostreistagni UST010306-043T, 97.8 % with Marinomonas aquimarina 11SM4T, 97.1 % with Marinomonas brasilensis R-40503T and 97.0 % with Marinomonas communis 8T. However, DNA–DNA relatedness between strain AN44T and closely related type strains was well below 70 %. On the basis of the data from the present polyphasic taxonomic study, strain AN44T is considered to represent a novel species of the genus Marinomonas , for which the name Marinomonas fungiae sp. nov. is proposed. The type strain is AN44T ( = JCM 18476T = LMG 27065T).

Anoxybacillus suryakundensis sp. nov, a moderately thermophilic, alkalitolerant bacterium isolated from hot spring at Jharkhand, India

Four closely related facultative anaerobe, moderately thermophilic, Gram positive rods (JS1(T), JS5, JS11, and JS15) were isolated from sediment samples from a hot spring at Suryakund, Jharkhand, India. Colonies were pale yellow, rough surface with uneven edges on TSA after 72 h incubation. Heterotrophic growth was observed at 40-60°C and pH 5.5-11.5; optimum growth occurred at 55°C and pH 7.5. 16S rRNA gene sequence analysis revealed the strains belong to genus Anoxybacillus. DNA-DNA homology values among strains were above 70% and showed distinct ERIC and REP PCR profile. On the basis of morphology and biochemical characteristics, strain JS1(T) was studied further. Strain JS1(T) showed 99.30% sequence similarity with A. flavithermus subsp. yunnanensis, 99.23% with A. mongoliensis, 99.16% with A. eryuanensis, 98.74% with A. flavithermus subsp. flavithermus, 98.54% with A. tengchongensis, 98.51% with A. pushchinoensis, 97.91% with A. thermarum, 97.82% with A. kaynarcensis, 97.77% with A. ayderensis and A. kamchatkensis, 97.63% with A. salavatliensis, 97.55% with A. kestanbolensis, 97.48% with A. contaminans, 97.27% with A. gonensis and 97.17% with A. voinovskiensis. In 16S rRNA secondary structure based phylogenetic comparison, strain JS1(T) was clustered with Anoxybacillus eryuanensis, A. mongoliensis, and A. flavithermus subsp. yunnanensis and showed 15 species specific base substitutions with maximum variability in helix 6. Moreover, DNA-DNA relatedness between JS1(T) and the closely related type strains were well below 70%. The DNA G+C content was 42.1 mol%. The major fatty acids were C(15:0 iso), C(16:0 iso) and C(17:0iso). The polar lipids were a phosphatidylgylycerol, a diphosphatidylglycerol, a phosphatidylethnolamine, a phosphatidylcholine, a phosphatidyl monomethylethanolamine and four unknown lipids. Based on polyphasic approach, strain JS1(T) represent a novel species of the genus Anoxybacillus for which Anoxybacillus suryakundensis sp. nov. is proposed. The type strain is JS1(T) (= DSM 27374(T) = LMG 27616(T) =JCM19211(T)).

Taxonomic study of the genus Tepidiphilus: transfer of Petrobacter succinatimandens to the genus Tepidiphilus as Tepidiphilus succinatimandens comb. nov., emended description of the genus Tepidiphilus and description of Tepidiphilus thermophilus sp. nov., isolated from a terrestrial hot spring

Comparative phenotypic, chemotaxonomic and genetic analysis revealed significant similarities among strains of the genera Tepidiphilus and Petrobacter. Analysis of 16S rRNA gene sequences and DNA-DNA relatedness of the type strains Tepidiphilus margaritifer N2-214(T) and Petrobacter succinatimandens 4BON(T) showed sequence similarity of 98.9 % and less than 40 % relatedness, indicating that these strains represent different species of same genus. Both strains had phosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine and diphosphatidylglycerol as major polar lipids. Their fatty acid profiles were almost identical, with the predominant fatty acids C16 : 0, C17 : 0 cyclo and C19 : 0 cyclo ω8c. In view of this, we propose to transfer the member of the genus Petrobacter to the genus Tepidiphilus as Tepidiphilus succinatimandens comb. nov. and to emend the description of the genus Tepidiphilus. Further, a novel bacterium, strain JHK30(T), was isolated from a terrestrial hot spring located at Jharkhand, India, and was identified following a polyphasic approach. Cells were non-sporulating, aerobic, Gram-stain-negative rods and motile by a single polar flagellum. Optimum temperature for growth was 50-55 °C at pH 6.5-7.0. 16S rRNA gene sequence analysis revealed 99.71 % similarity with P. succinatimandens 4BON(T) ( = DSM 15512(T)) and 98.71 % with T. margaritifer N2-214(T) ( = DSM 15129(T)). However, DNA-DNA relatedness of strain JHK30(T) with these two type strains was well below 70 %. The DNA G+C base composition was 66.1 mol%. Strain JHK30(T) represents a novel species of the genus Tepidiphilus for which the name Tepidiphilus thermophilus sp. nov. is proposed. The type strain is JHK30(T) ( = JCM 19170(T) = LMG 27587(T)= DSM 27220(T)).