Fig. 2. Scanning electron micrograph of the strain SM5_A1T grown on PVGV agar [Magnification bar=(a) 10 µm, (b) 3 µm].

Deinococcus pantiae sp. nov., a UV-resistant bacterium isolated from a lake in Schirmacher Oasis, Antarctica. Get the full details in IJSEM: https://doi.org/10.1099/ijsem.0.007071

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Cover of the International Journal of Systematic and Evolutionary Microbiology, official publication of the ICSP, featuring bacterial imagery.

The International Committee on Systematics of Prokaryotes (ICSP) is pleased to announce that the 2026 revision of the International Code of Nomenclature of Prokaryotes has now been published in IJSEM.
View the updated ICNP here: https://doi.org/10.1099/ijsem.0.006979

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Fig. 3. (a) Pinpoint MNWGS58T colonies on blood agar after 24 h of incubation (37 °C, 5% CO2). (b) Mature MNWGS58T colony on blood agar after 48 h of incubation (37 °C, 5% CO2). (c) Gram stain of MNWGS58T showing Gram-positive rod-shaped cells with coryneform morphology.

Corynebacterium drakensteinense sp. nov., isolated from the nasopharynx of a healthy South African infant. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: https://doi.org/10.1099/ijsem.0.007068
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Cells of FW153T (a) and FW199T (b). Bars are 5 µm.

Rhizorhabdus antheiae sp. nov. and Sphingomonas eleionomae sp. nov., new aerobic anoxygenic phototrophs isolated from a Manitoban marsh. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: https://doi.org/10.1099/ijsem.0.007018 #IJSEM #PublishandRead

NJ tree showing the phylogenetic relationships of strains AW1-3T and AW1-7T with closely related taxa based on 16S rRNA gene sequences. Bootstrap values greater than 70% (based on 1,000 replicates) are indicated at the corresponding nodes. Filled circles (●) denote nodes also supported by ML and MP algorithms. Sphingobacterium spiritivorum ATCC 33861T (M58778) was used as the outgroup. The scale bar indicates 0.01 nucleotide substitutions per site.

Mucilaginibacter aureus sp. nov. and Mucilaginibacter sediminis sp. nov., isolated from wetland soil. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: https://doi.org/10.1099/ijsem.0.007042 #IJSEM #PublishandRead

Fig. 2: Heatmap of pairwise ANI values of the 23 strains and their closely related taxa.

Ten novel psychrophilic Flavobacterium species from Tibetan Plateau glaciers define a cryospheric lineage with global cold-origin relatives. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: https://doi.org/10.1099/ijsem.0.007021 #IJSEM #PublishandRead

Fig. 3. Scanning electron micrographs of clusters of RSM42T.

Rothia similimucilaginosa sp. nov., isolated from the human nasal cavity. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: https://doi.org/10.1099/ijsem.0.007024 #IJSEM #PublishandRead

ML phylogenetic tree based on nearly complete 16S rRNA gene sequence showing the relationship between strain TSD2052T and related type species. Bootstrap values (>50%) from 1,000 replicates are indicated at each node. Filled circles indicate nodes recovered by all three algorithms (NJ, ML and MP), whereas open circles indicate nodes recovered by two of the three algorithms. Pseudomonas aeruginosa DSM 50071T (X06684) was used as the outgroup. GenBank accession numbers are indicated in parentheses. Scale bar represents 0.02 substitutions per nucleotide position.

Agarivorans sediminis sp. nov., an alginate-degrading bacterium isolated from sediment. Find out more in IJSEM: doi.org/10.1099/ijse...

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NJ tree showing the phylogenetic relationships of strains S174ᵀ and W118ᵀ with closely related type strains based on 16S rRNA gene sequences.

Flagellimonas ulvae sp. nov. and Flagellimonas rhodophyticola sp. nov., isolated from marine algae. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse...

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A chronology of the major changes that took place in the history of Acinetobacter in the period from 1900 to 1980.

History of the taxonomy of Acinetobacter: the emergence of hospital-adapted species of global health concern. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse...

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RYU staining of novel Dryocola strains revealing peritrichous flagella.

Description of three new Dryocola species: Dryocola mayonis sp. nov., Dryocola sharpae sp. nov.and Dryocola baronae sp. nov., isolated from human clinical samples. Available to read in IJSEM: doi.org/10.1099/ijse...

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Phylogenetic position of strains HTMS2, HTMS3T and representatives of other related taxa. The tree was constructed based on a distance matrix analysis of the 16S rRNA gene sequence using the neighbour-joining method. Aquicella lusitana SGT-39T (AY359282) was used as an outgroup. Bootstrap resampling analysis was performed for the neighbour-joining, maximum-likelihood and maximum-parsimony methods to estimate the confidence of the tree topologies. The numbers at the nodes indicate bootstrap values for the neighbour-joining method. Branching points with support above 50% in all three analyses are indicated by solid circles, whereas nodes with open circles indicate bootstrap support in the two analyses. The scale bar represents the 0.02 substitutions per nucleotide position.

Puribacter membranae gen. nov., sp. nov., isolated from a biofilm of a membrane bioreactor (MBR) treating sewage. Read now in IJSEM: doi.org/10.1099/ijse... #IJSEM

Transmission electron micrograph of P. graminicola sp. nov. strain KXB24ᵀ, showing rod-shaped cells with multiple peritrichous flagella.

Pantoea graminicola sp. nov., a Gram-negative bacterium isolated from sweet corn (Zea mays L.) in the USA. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse... #IJSEM #PublishAndRead

The taxonomic position of strain P3-BQ1T within the phylogeny of 35 type species of the genus Tenacibaculum, using the neighbour-joining method with the Jukes–Cantor model based on 1,366 bp of the 16S rRNA gene. Evolutionary distances were calculated with bootstrap support from 1000 replicates. Polaribacter filamentus ATCC 700397T was used as an outgroup.

Tenacibaculum salmonis sp. nov., isolated from Atlantic salmon (Salmo salar L.) fish farmed in Chile. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse... #IJSEM #PublishAndRead

Phylogeny of the type strains within the M. gordonae complex and related species based on 16S rRNA gene sequences (a) and core gene alignment (b).

Mycobacterium camsae sp. nov. and Mycobacterium pumcae sp. nov., two species isolated from human skin infection. Available to read in IJSEM: doi.org/10.1099/ijse... #IJSEM

Transmission electron micrographs of strains A079T (a) and A081T (b). Bar, 1 µm.

Alteromonas algae sp. nov. and Alteromonas ulvae sp. nov., isolated from the seaweed Ulva prolifera dominating green tides in the Yellow Sea. Discover more in IJSEM: doi.org/10.1099/ijse... #IJSEM

Phylogenetic relationships between strains 2210JD6-5T and 2308TA14-22T and type strains of the genus Aureibaculum, based on 16S rRNA gene sequences. The tree was constructed with the ML algorithm. Filled circles (●) indicate the corresponding nodes that were also recovered in the trees generated with the NJ and MP algorithms. Bootstrap values (>70%) based on 1,000 replicates are shown on branch nodes. Wenyingzhuangia marina DSM 100572T (jgi. 1107797) was used as an outgroup. The scale bar equals 0.01 changes per nucleotide position.

Aureibaculum koreense sp. nov. and Aureibaculum conchae sp. nov., isolated from the marine molluscs. Available to read in IJSEM: doi.org/10.1099/ijse... #IJSEM

Concentric pangenome circle plot of five Nonomuraea genomes. 1, G32T; 2, N. turkmeniaca DSM 43926T; 3, N. polychroma DSM 43925T; 4, N. endophytica DSM 45385T; 5, N. aridisoli KC333T. Red segments denote singleton families unique to the base genome; light-blue segments are non-core families shared by two to four genomes; dark-blue segments are core families present in all five genomes.

Comparative genomics and ecological insights into Nonomuraea turcica sp. nov., an actinomycete from Black Sea island soil. Read now in IJSEM: doi.org/10.1099/ijse... #IJSEM

Phylogenomic tree showing the relationship between strain PLA-1-18T and the most closely related type strains obtained using the TYGS platform (https://tygs.dsmz.de/). The branch lengths are scaled in terms of the GBDP distance formula d5. The tree was inferred with FastME 2.1.6.1 from GBDP distances calculated from genome sequences.

Solicola agrisoli sp. nov., a novel actinobacterium isolated from agricultural soil in Republic of South Korea. Read more about this in IJSEM: doi.org/10.1099/ijse... #IJSEM

Budding cells of B. discipulorum sp. nov. PYCC 10016 (a) and C. hibernica sp. nov. PYCC 10015 (b), grown on YM agar at 25 °C for 2 days, and detail of a hypha of C. hibernica PYCC 10015 (c) formed on corn meal agar after 2 weeks of incubation at 18 °C. Scale bars=5 µm.

Cyberlindnera hibernica sp. nov. and Barnettozyma discipulorum sp. nov., isolated from forest soil in Ireland. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: #IJSEM #PublishAnd Read doi.org/10.1099/ijse...

Scatter plots of Rhodococcus inter-subgenus AAI scores. The horizontal dashed line indicates the standard 65% AAI threshold for genus demarcation [17, 18, 20]. The “upper” rhodococcal subgenus demarcation boundary is AAI=73%. The average AAI value for each subgenus is represented by a black horizontal line.

Leveraging the subgenus category to address monophyletic genus over-splitting: illustration with recently proposed Mycobacteriales genera. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse... #IJSEM #PublishAndRead

A fish out of water? Researchers at the University of Hawai'i Manoa identify a novel species of Caulobacter bacteria from a seawater sample that is unable to survive the salty conditions, in a new paper published in #IJSEM

Transmission electron micrograph of negatively stained cells of the type strains of 12 novel species. Letters (a)–(l) represent LT1P40T, LB2R24T, LB3N6T, RB3P16T, RT2P30T, ZT3P38T, ZB1N12T, GB1N7T, PB2P12T, PB2P19T, PB4P5T and PB1R3T, respectively. The black line represents a scale of 1 µm. The inset panels in the lower left corner display an enlarged view of the flagellum.

Diverse biofilm-forming Sphingomonadaceae represent twelve novel species isolated from glaciers on the Tibetan Plateau. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse... #IJSEM #PublishAndRead

Scanning electron micrograph showing the spore chain morphology and spore surface of strain A1-08T under 10,000× and 80,000× magnification, respectively.

Streptomyces mayonensis sp. nov., isolated from the volcanic soils of Mt. Mayon, Philippines. Published in IJSEM: doi.org/10.1099/ijse... #IJSEM

Fig. 1. Bayesian phylogenetic tree (GTR+G+I substitution model) inferred from 53 full-length concatenated ribosome protein subunit (rps) gene sequences for Phyllobacterium meliloti sp. nov. strain T1293T and reference taxa. Alignment length, 22,868 positions. NCBI sequence accession numbers are given in parentheses. Mesorhizobium ventifaucium STM 4922T was used as the outgroup. Posterior probabilities ≥0.90 are shown. Bar, expected substitutions per site.

Characterization of Phyllobacterium spp. isolated from root nodules of Melilotus albus (white sweet clover) grown in Canada and description of Phyllobacterium meliloti sp. nov. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse... #IJSEM

Fig. 6. Casein degradation on skim milk agar supplemented with bromocresol purple. C. caseinilyticum sp. nov. FAM 1755T (a), C. caseinilyticum sp. nov. CREA 4990 (b), C. caseinilyticum sp. nov. FAM 27665 (c) and C. sporogenes DSM 795T (d). C. tepidum DSM 104389T was unable to grow on skim milk agar.

Clostridium caseinilyticum sp. nov., a close relative of Clostridium tepidum and Clostridium sporogenes, isolated from spoiled cheese and silage. See more in IJSEM: doi.org/10.1099/ijse... #IJSEM

Fig. 6. Cryo-scanning electron micrographs of strain DT45T grown on MHA at 28 °C for 1 week. For a detailed description of the different panels, refer to the main text.

Melissospora conviva gen. nov., sp. nov., a novel actinobacterial genus isolated from beehive through cross-feeding interactions. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse... #IJSEM #PublishAndRead

Fig. 1. NJ tree based on 16S rRNA gene sequences showing the relationships of strains CPCC 206391T, CPCC 206435T, CPCC 206453T and CPCC 206450T with other representatives of the family Intrasporangiaceae. Filled circles indicate that the corresponding nodes were also recovered in phylogenetic trees generated using maximum likelihood and maximum parsimony methods. Bootstrap values above 50% are shown as percentages of 1,000 replicates. Arthrobacter agilis DSM 20550T was used as the outgroup. Scale bar indicates 0.01 nt substitutions per alignment site.

Knoellia altitudinis sp. nov., Knoellia pratensis sp. nov., Knoellia terrae sp. nov. and Knoellia tibetensis sp. nov., four novel UV radiation-resistant actinobacteria isolated from Tibet Autonomous Region, China. Published in IJSEM: doi.org/10.1099/ijse... #IJSEM

The morphology of R. silvicola sp. nov. strain CGMCC 2.7770T observed on YPD agar after 1 week at 20 °C includes colony morphology (a) and vegetative cells (b). Bars: 10 µm.

Rhodotorula silvicola sp. nov., a new yeast species from plant-associated substrates and mushroom. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse... #IJSEM #PublishAndRead

Sox system pathways and the corresponding enzyme EC numbers in strain 2305UL40-4ᵀ.

Aestuariibius violaceus sp. nov., isolated from a marine limpet Cellana toreuma. Published Open Access and fee-free in IJSEM using a Publish and Read agreement: doi.org/10.1099/ijse... #IJSEM #PublishAndRead