- Volume 73, Issue 3, 2023
Volume 73, Issue 3, 2023
- New Taxa
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- Pseudomonadota
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Chelativorans petroleitrophicus sp. nov., a paraffin oil-degrading bacterium isolated from a mixture of oil-based drill cuttings and paddy soil
We isolated a paraffin oil-degrading bacterial strain from a mixture of oil-based drill cutting and paddy soil, and characterized the strain using a polyphasic approach. The Gram-positive, aerobic, rod-shaped and non-spore-forming strain (SCAU 2101T) grew optimally at 50 °C, pH 7.0 and 0.5 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequence indicated that the strain represented a distinct clade in the genus Chelativorans, neighbouring Chelativorans intermedius LMG 28482T (97.1 %). The genome size and DNA G+C content of the strain were 3 969 430 bp and 63.1 mol%, respectively. Whole genome based phylogenomic analyses showed that the average nucleotide identity and digital DNA–DNA hybridization values between strain SCAU 2101T and C. intermedius LMG 28482T were 77.5 and 21.2 %, respectively. The major respiratory quinone was Q-10. The dominant fatty acids were C19 : 0 cyclo ω8c (50.6 %), summed feature 8 (C18 : 1 ω7c and/or C18 : 1 ω6c; 22.5 %) and C18 : 0 (13.8 %). The polar lipids of the strain included phosphatidylethanolamine, phosphatidylmonomethylethanolamine, phosphatidylglycerol, phosphatidylcholine and diphosphatidylglycerol. Based on the results, strain SCAU 2101T was considered to represent a novel species in the genus Chelativorans , for which the name Chelativorans petroleitrophicus sp. nov. is proposed. The type strain is SCAU 2101T (= CCTCC AB 2021125T=KCTC 92067T).
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Phylogenomic analysis of the genus Rosenbergiella and description of Rosenbergiella gaditana sp. nov., Rosenbergiella metrosideri sp. nov., Rosenbergiella epipactidis subsp. epipactidis subsp. nov., Rosenbergiella epipactidis subsp. californiensis subsp. nov., Rosenbergiella epipactidis subsp. japonicus subsp. nov., Rosenbergiella nectarea subsp. nectarea subsp. nov. and Rosenbergiella nectarea subsp. apis subsp. nov., isolated from floral nectar and insects
The genus Rosenbergiella is one of the most frequent bacterial inhabitants of flowers and a usual member of the insect microbiota worldwide. To date, there is only one publicly available Rosenbergiella genome, corresponding to the type strain of Rosenbergiella nectarea (8N4T), which precludes a detailed analysis of intra-genus phylogenetic relationships. In this study, we obtained draft genomes of the type strains of the other Rosenbergiella species validly published to date ( R. australiborealis , R. collisarenosi and R. epipactidis ) and 23 additional isolates of flower and insect origin. Isolate S61T, retrieved from the nectar of an Antirrhinum sp. flower collected in southern Spain, displayed low average nucleotide identity (ANI) and in silico DNA–DNA hybridization (isDDH) values when compared with other Rosenbergiella members (≤86.5 and ≤29.8 %, respectively). Similarly, isolate JB07T, which was obtained from the floral nectar of Metrosideros polymorpha plants in Hawaii (USA) had ≤95.7 % ANI and ≤64.1 % isDDH with other Rosenbergiella isolates. Therefore, our results support the description of two new Rosenbergiella species for which we propose the names Rosenbergiella gaditana sp. nov. (type strain: S61T=NCCB 100789T=DSM 111181T) and Rosenbergiella metrosideri sp. nov. (JB07T=NCCB 100888T=LMG 32616T). Additionally, some R. epipactidis and R. nectarea isolates showed isDDH values<79 % with other conspecific isolates, which suggests that these species include subspecies for which we propose the names Rosenbergiella epipactidis subsp. epipactidis subsp. nov. (S256T=CECT 8502T=LMG 27956T), Rosenbergiella epipactidis subsp. californiensis subsp. nov. (FR72T=NCCB 100898T=LMG 32786T), Rosenbergiella epipactidis subsp. japonicus subsp. nov. (K24T=NCCB 100924T=LMG 32785T), Rosenbergiella nectarea subsp. nectarea subsp. nov. (8N4T = DSM 24150T = LMG 26121T) and Rosenbergiella nectarea subsp. apis subsp. nov. (B1AT=NCCB 100810T= DSM 111763T), respectively. Finally, we present the first phylogenomic analysis of the genus Rosenbergiella and update the formal description of the species R. australiborealis , R. collisarenosi , R. epipactidis and R. nectarea based on new genomic and phenotypic information.
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Tsuneonella litorea sp. nov., a novel carotenoid-producing bacterium isolated from coastal sediment
More LessA Gram-stain-negative, aerobic, non-motile and pleomorphic bacterium designated as YG55T was isolated from a coastal sediment sample. Growth was found to occur at 10–37 °C (optimum, 28 °C), at pH 6–9 (optimum, pH 8) and in 0–6 % NaCl (optimum, 1 %). The results of 16S rRNA gene-based analysis showed that strain YG55T was related to the members of the genus Tsuneonella and shared the highest identity of 99.4 % with Tsuneonella dongtanensis GDMCC 1.2307T, followed by Tsuneonella troitsensis JCM 17037T (98.4 %). The phylogenomic results indicated that strain YG55T formed an independent branch distinct from the reference type strains. The 22.7 and 21.8 % digital DNA–DNA hybridization (dDDH) values and 83.0 and 81.8 % average nucleotide identity (ANI) values between strain YG55T and the two relatives were below the species definition thresholds of 70 % (dDDH) and 95–96 % (ANI), indicating that the strain represents a novel genospecies. The results of chemotaxonomic characterization indicated that the major cellular fatty acids of strain YG55T were summed feature 8 (C18 : 1 ω6c and/or C18 : 1 ω7c), C14 : 0 2OH and C16 : 0; the main polar lipids comprised diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine and sphingoglycolipid; the respiratory quinone was ubiquinone-10. The genomic size and DNA G+C contents were 3.03 Mbp and 66.98 %. The strain contained carotenoid biosynthesis genes and could produce carotenoids. Based on its genotypic and phenotypic characteristics, strain YG55T is concluded to represent a novel species of the genus Tsuneonella , for which the name Tsuneonella litorea sp. nov. is proposed. The type strain is YG55T (=GDMCC 1.2590 T=KCTC 82812T).
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Scleromatobacter humisilvae gen. nov., sp. nov., a novel bacterium isolated from oak forest soil
More LessA novel bacterial strain, designated BS-T2-15T, isolated from forest soil in close proximity to decaying oak wood, was characterized using a polyphasic taxonomic approach. Phylogenetic analyses based on 16S rRNA gene sequences as well as phylogenomic analyses based on coding sequences of 340 concatenated core proteins indicated that strain BS-T2-15T forms a distinct and robust lineage in the Rubrivivax–Roseateles –Leptothrix–Azohydromonas –Aquincola–Ideonella branch of the order Burkholderiales . The amino acid identity and the percentage of conserved proteins between the genome of strain BS-T2-15T and genomes of closely related type strains ranged from 64.27 to 66.57% and from 40.89 to 49.27 %, respectively, providing genomic evidence that strain BS-T2-15T represents a new genus. Its cells are Gram-stain-negative, aerobic, motile by a polar flagellum, rod-shaped and form incrusted white to ivory colonies. Optimal growth is observed at 20–22 °C, pH 6 and 0% NaCl. The predominant fatty acids of strain BS-T2-15T are C16 : 1 ω7c, C16 : 0 and C14 : 0 2-OH. Its polar lipid profile consists of a mixture of phosphatidylethanolamine, diphosphatidylglycerol and phosphatidylglycerol and its main respiratory quinone is ubiquinone 8. The estimated size of its genome is 6.28 Mb with a DNA G+C content of 69.56 mol%. Therefore, on the basis of phenotypic and genotypic properties, the new strain BS-T2-15T represents a novel genus and species for which the name Scleromatobacter humisilvae gen. nov., sp. nov., is proposed. The type strain is BS-T2-15T (DSM 113115T=UBOCC-M-3373T).
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Roseobacter insulae sp. nov. and Loktanella gaetbuli sp. nov., isolated from tidal flats in the Yellow Sea in Korea
More LessTwo bacterial strains (designated as YSTF-M11T and TSTF-M6T) were isolated from tidal flat sediments of the Yellow Sea, Republic of Korea, and taxonomically characterized. A neighbour-joining phylogenetic tree based on 16S rRNA gene sequences showed that strain YSTF-M11T clusters with the type strains of Roseobacter species and strain TSTF-M6T clusters with the type strains of Loktanella salsilacus , Loktanella fryxellensis and Loktanella atrilutea . Strains YSTF-M11T and TSTF-M6T exhibited 16S rRNA gene sequence similarity values of 97.5–98.9 % and 94.1–97.2 % to the type strains of four Roseobacter species and to the type strains of four Loktanella species, respectively. An UBCG tree based on genomic sequences and a tree based on AAI showed that strains YSTF-M11T and TSTF-M6T form a cluster with the type strains of Roseobacter species and with the type strains of L. salsilacus , L. fryxellensis and L. atrilutea , respectively. The ANI and dDDH values between genomic sequences of strain YSTF-M11T and the type strains of four Roseobacter species and between those of strain TSTF-M6T and the type strains of the three Loktanella species were in ranges of 74.0–75.9 and 18.2–19.7 % and 74.7–75.5 and 18.8–19.3 %, respectively. The DNA G+C contents of strains YSTF-M11T and TSTF-M6T were 60.3 and 61.9 % based on their genomic sequences. Both strains contained Q-10 as the predominant ubiquinone and C18 : 1 ω7c as the major fatty acid. Strains YSTF-M11T and TSTF-M6T were separated from recognized Roseobacter species and L. salsilacus , L. fryxellensis and L. atrilutea , respectively, by their phenotypic properties together with the phylogenetic and genetic distinctiveness. Based on data presented in this study, strains YSTF-M11T (=KACC 21642T =NBRC 115155T) and TSTF-M6T (=KACC 21643T =NBRC 115154T) are considered to represent novel species of the genera Roseobacter and Loktanella , respectively, for which the names Roseobacter insulae sp. nov. and Loktanella gaetbuli sp. nov. are proposed.
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Alcanivorax xiamenensis sp. nov., a novel marine hydrocarbonoclastic bacterium isolated from surface seawater
More LessA novel Alcanivorax -related strain, designated 6-D-6T, was isolated from the surface seawater collected around Xiamen Island. The novel strain is Gram-stain-negative, rod-shaped and motile, and grows at 10–45 °C, pH 6.0–9.0 and in the presence of 0.5–15.0 % (w/v) NaCl. Phylogenetic analysis based on the 16S rRNA gene sequences indicated that it belongs to the genus Alcanivorax , with the highest sequence similarity to Alcanivorax dieselolei B5T (99.9 %), followed by Alcanivorax xenomutans JC109T (99.5 %), Alcanivorax balearicus MACL04T (99.3 %) and other 13 species of the genus Alcanivorax (93.8 %–95.6 %). The digital DNA–DNA hybridization and average nucleotide identity values between strain 6-D-6T and three close type strains were 40.1–42.9/90.6–91.4 %, and others were below 22.9/85.1 %, respectively. The novel strain contained major cellular fatty acids of C16 : 0 (31.0 %), C19 : 0 ω8c cyclo (23.5 %), C17 : 0 cyclo (9.7 %), C12 : 0 3OH (8.6 %), summed feature 8 (7.6 %) and C12 : 0 (5.4 %). The genomic G+C content of strain 6-D-6T was 61.38 %. Phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, two unidentified phospholipids and one amino-group-containing phospholipid were detected. On the basis of phenotypic and genotypic characteristics, strain 6-D-6T represents a novel species within the genus Alcanivorax , for which the name Alcanivorax xiamenensis sp. nov. is proposed. The type strain is 6-D-6T (=MCCC 1A01359T=KCTC 92480T).
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Qipengyuania spongiae sp. nov., isolated from marine sponge Cinachyrella kuekenthali
More LessA novel bacterial strain, designated as PHS-Z21T, was isolated from the marine sponge Cinachyrella kuekenthali collected from PG Dave’s Rock, Philippines. Cells of PHS-Z21T are Gram-stain-negative, non-motile, pale-yellow-pigmented, short rods. PHS-Z21T is able to grow at 10–40 ℃ (optimum, 30 ℃), pH 5.5–9.0 (optimum, pH 8.5) and with 3–9 % (w/v) NaCl (optimum, 4 %). Its 16S rRNA gene sequence shows 98.6 % similarity to Qipengyuania nanhaisediminis CGMCC 1.7715T, 98.5 % similarity to Qipengyuania vulgaris 022-2-10T and 98.4 % similarity to Qipengyuania flava SW-46T, respectively. The phylogenetic tree based on 16S rRNA gene sequences reveals that PHS-Z21T is clustered with Q. flava SW-46T. The total genome of PHS-Z21T is approximately 2 932 896 bp in size with a DNA G+C content of 64.7 %. The average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values among PHS-Z21T and other type strains are 70.0–77.3 % (ANIb), 83.3–86.8 % (ANIm) and 13.0–26.9 % (dDDH), respectively. The dDDH and ANI values are below the standard cutoff criteria for delineating bacterial species. Percentage of conserved proteins (POCP) values between the genome of strain PHS-Z21T and those of members of the genera Qipengyuania , Erythrobacter , Altererythrobacter and Alteriqipengyuania were 62.0–74.5 %, 55.8–63.2 %, 60.7–66.9 % and 63.9–66.8%, respectively, while the AAI values were 68.4–74.3 %, 63.8–65.9 %, 66.3–68.3 % and 64.7–66.9%, respectively. The major fatty acids of PHS-Z21T are composed of summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c), C18 : 1ω7c 11-methyl, C16 : 0 and summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c). The polar lipids of PHS-Z21T mainly consist of diphosphatidylglycerol, glycolipid, phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol and glycophospholipid. The respiratory lipoquinone was identified as Q-10. On the basis of the phenotypic and phylogenetic data, strain PHS-Z21T represents a novel species of the genus Qipengyuania , for which the name Qipengyuania spongiae sp. nov. is proposed. The type strain is PHS-Z21T (=MCCC 1K07849T=KCTC 92590T).
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Roseomonas fluvialis sp. nov., an aerobic bacteriochlorophyll a-containing freshwater bacterium isolated from river epilithic biofilm
More LessA strictly aerobic bacteriochlorophyll a-containing alphaproteobacterium, designated strain S08T, was isolated from a biofilm sampled at Tama River in Japan. The non-motile and rod-shaped cells formed pink-beige pigmented colonies on agar plates containing organic compounds and showed in vivo absorption maxima at 798 and 866 nm in the near-infrared region, typical for the presence of bacteriochlorophyll a. The new bacterial isolate is Gram-negative, oxidase-negative and catalase-positive. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain S08T was closely related to species in the genus Roseomonas . The closest phylogenetic relative of strain S08T was Roseomonas lacus TH-G33T (98.2 % sequence similarity). The major cellular fatty acids were C16 : 0, C18 : 1 2-OH and summed feature 8 (C18 : 1 ω7c/C18 : 1 ω6c). The predominant respiratory quinone was ubiquinone-9. The major polar lipids contained diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine and an aminolipid. The G+C content of the genomic DNA was 70.6 mol%. The average nucleotide identity and digital DNA–DNA hybridization values between strain S08T and the related Roseomonas type strains were all far lower than the cut-off value for the delineation of species. The results of polyphasic comparisons showed that strain S08T was clearly distinguishable from other members of the genus Roseomonas . Therefore, we propose a new species in the genus Roseomonas , namely, Roseomonas fluvialis sp. nov. The type strain is S08T (=DSM 111902T=NBRC 112025T).
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- Eukaryotic Micro-Organisms
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Wickerhamiella bidentis sp. nov., a novel yeast species isolated from flowers and insects in Japan
More LessTwo strains were isolated from flowers and insects in Japan, namely NBRC 115686T and NBRC 115687, respectively. Based on sequence analysis of the D1/D2 domain of the 26S large subunit (LSU) rRNA gene and the internal transcribed spacer (ITS) region and physiological characteristics, these strains were found to represent a novel yeast species of the genus Wickerhamiella. Considering pairwise sequence similarity, NBRC 115686T and NBRC 115687 differ from the type strain of the most closely related species, Wickerhamiella galacta NRRL Y-17645T, by 65–66 nucleotide substitutions with 12 gaps (11.65–11.83 %) in the D1/D2 domain of the LSU rRNA gene. The novel species differ from the closely related Wickerhamiella species in some physiological characteristics. For example, compared with Wickerhamiella galacta JCM 8257T, NBRC 115686T and NBRC 115687 assimilated d-galactose, and could grow at 35 and 37 °C. Hence, the name Wickerhamiella bidentis sp. nov. is proposed to accommodate this species in the genus Wickerhamiella. The holotype is NBRC 115686T (ex-type strain JCM 35540=CBS 18008).
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Spathaspora brunopereirae sp. nov. and Spathaspora domphillipsii sp. nov., two d-xylose-fermenting ascosporogenous yeasts from Amazonian Forest biomes
Four isolates of Spathaspora species were recovered from rotting wood collected in two Brazilian Amazonian biomes. The isolates produced unconjugated allantoid asci with a single elongated ascospore with curved ends. Sequence analysis of the ITS-5.8S region and the D1/D2 domains of the large subunit rRNA gene showed that the isolates represent two different novel Spathaspora species, phylogenetically related to Sp. boniae. Two isolates were obtained from rotting wood collected in two different sites of the Amazonian forest in the state of Pará. The name Spathaspora brunopereirae sp. nov. is proposed to accommodate these isolates. The holotype of Spathaspora brunopereirae sp. nov. is CBS 16119T (MycoBank MB846672). The other two isolates were obtained from a region of transition between the Amazonian forest and the Cerrado ecosystem in the state of Tocantins. The name Spathaspora domphillipsii sp. nov. is proposed for this novel species. The holotype of Spathaspora domphillipsii sp. nov. is CBS 14229T (MycoBank MB846697). Both species are able to convert d-xylose into ethanol and xylitol, a trait with biotechnological applications.
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Diddensiella parasantjacobensis f.a., sp. nov., a yeast species from forest habitats
More LessSix conspecific yeast strains, representing an undescribed species, were isolated from rotten wood collected in different locations in Hungary and Germany and an additional one from fungal fruiting body in Taiwan. The seven strains share identical nucleotide sequences in the D1/D2 domain of the nuclear large subunit (LSU) rRNA gene. The Hungarian and Taiwanese isolates share identical internal transcribed spacer (ITS) sequences as well, while the two German isolates differ from them merely by three substitutions and four indels in this region. The investigated strains are very closely related to Diddensiella santjacobensis. Along their LSU D1/D2 domain they differ only by one substitution from the type strain of D. santjacobensis. However, in the ITS region of Hungarian and Taiwanese strains we detected 3.5 % divergence (nine substitutions and nine indels) between the undescribed species and D. santjacobensis, while the German strains differed by 13 substitutions and nine indels from D. santjacobensis. This ITS sequence divergence has raised the possibility that the strains investigated in this study may represent a different species from D. santjacobensis. This hypothesis was supported by comparisons of partial translation elongation factor 1-α (EF-1α) and cytochrome oxidase II (COX II) gene sequences. While no difference and 1–2 substitutions among the partial EF-1α and COX II gene sequences of the strains of the undescribed species, respectively, were detected; the undescribed species differ by about 4 % (36 substitutions) and 10 % (50–51 substitutions) from D. santjacobensis in these regions. Parsimony network analysis of the partial COX II gene sequences also separated the investigated strains from the type strain of D. santjacobensis. In this paper we propose Diddensiella parasantjacobensis f.a., sp. nov. (holotype: NCAIM Y.02121; isotypes: CBS 17819, DSM 114156) to accommodate the above-noted strains.
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- ICSP Matters
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Guidelines for interpreting the International Code of Nomenclature of Prokaryotes and for preparing a Request for an Opinion
In this paper the Judicial Commission provides general guidance for interpreting the International Code of Nomenclature of Prokaryotes (ICNP) and specific assistance to authors, reviewers and editors of a Request for an Opinion, or of other suggestions related to the ICNP. The role of the Judicial Commission is recapitulated, particularly with respect to the processing of such Requests. Selected kinds of nomenclature-related proposals are discussed that are unsuitable as the basis for a Request. Particular emphasis is put on Requests for placing names or epithets on the list of nomina rejicienda, and a dichotomous identification key is provided to guide potential authors of a Request that targets the name of a species or subspecies because of issues with its type strain. To this end, the criteria for the valid publication of such names under the ICNP are revisited. Aspects of other kinds of Requests are also addressed. The study is based on a comprehensive review of all Judicial Opinions issued since the publication of the Approved Lists in 1980. One goal of this paper is to assist potential authors in deciding whether their concern should be the subject of a Request, and if so, in composing it with the greatest chance of success. It is also clarified how to obtain additional help regarding nomenclature-related issues.
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Judicial Opinion 128
Judicial Opinion 128 addresses nomenclatural issues related to the names of classes validly published under the International Code of Nomenclature of Prokaryotes. It is confirmed that the common ending -proteobacteria of some class names is not indicative of a joint taxonomic or phylogenetic placement; that the nomenclatural type of Mollicutes Edward and Freundt 1967 (Approved Lists 1980) is Mycoplasmatales Freundt 1955 (Approved Lists 1980); and that the placement of a name on the list of rejected names does not imply that another name with the same spelling but a distinct rank is also placed on that list. The names at the rank of class Anoxyphotobacteria (Gibbons and Murray 1978) Murray 1988, Archaeobacteria Murray 1988, Bacteria Haeckel 1894 (Approved Lists 1980), Firmibacteria Murray 1988, Microtatobiotes Philip 1956 (Approved Lists 1980), Oxyphotobacteria (ex Gibbons and Murray 1978) Murray 1988, Photobacteria Gibbons and Murray 1978 (Approved Lists 1980), Proteobacteria Stackebrandt et al. 1988, Schizomycetes Nägeli 1857 (Approved Lists 1980), Scotobacteria Gibbons and Murray 1978 (Approved Lists 1980) are placed on the list of rejected names. For three common nominative singular suffixes of genus names their genitive singular and nominative plural forms are confirmed: -bacter (-bacteris, -bacteres); -fex (-ficis, -fices); and -genes (-genis, -genes). The class names Aquificae Reysenbach 2002, Chrysiogenetes Garrity and Holt 2002, Chthonomonadetes Lee et al. 2011, Gemmatimonadetes Zhang et al. 2003, Opitutae Choo et al. 2007 and Verrucomicrobiae Hedlund et al. 1998 are orthographically corrected to Aquificia, Chrysiogenia, Chthonomonadia, Gemmatimonadia, Opitutia and Verrucomicrobiia, respectively.
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Volumes and issues
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Volume 74 (2024)
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