Name: Tritonibacter horizontis Klotz et al. 2018

Category: Species

Proposed as: sp. nov.

Etymology: ho.ri.zon’tis. L. gen. masc. n. horizontis, of the horizon, referring to the Deep Water Horizon oil spill

Pronunciation (Latin), gender: tri-to-ni-BAK-ter ho-ri-ZON-tis, masculine

Type strain: DSM 101689; LMG 29740; O3.65

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: LPUY01000004 Analyse FASTA

Valid publication: Klotz F, Brinkhoff T, Freese HM, Wietz M, Teske A, Simon M, Giebel HA. Tritonibacter horizontis gen. nov., sp. nov., a member of the Rhodobacteraceae, isolated from the Deepwater Horizon oil spill. Int J Syst Evol Microbiol 2018; 68:736-744. 🇩🇪

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 68, part 3 of the IJSEM. Int J Syst Evol Microbiol 2018; 68:1823-1824.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    Epibacterium horizontis (Klotz et al. 2018) Liang et al. 2021	homotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus Tritonibacter Klotz et al. 2018. Publication: Klotz F, Brinkhoff T, Freese HM, Wietz M, Teske A, Simon M, Giebel HA. Tritonibacter horizontis gen. nov., sp. nov., a member of the Rhodobacteraceae, isolated from the Deepwater Horizon oil spill. Int J Syst Evol Microbiol 2018; 68:736-744. 🇩🇪
  • 😷 The risk group for Germany has been imported on 2026-08-13. The full classification is: risk group = 1. — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 1 time in PubMed until 2026-06-11.
  • 🧍 According to Ludwig et al. (2021), this "species affiliates away from its type species and may be reclassified as a new genus". Publication: Ludwig W, Viver T, Westram R, Francisco Gago J, Bustos-Caparros E, Knittel K, Amann R, Rossello-Mora R. Release LTP_12_2020, featuring a new ARB alignment and improved 16S rRNA tree for prokaryotic type strains. Syst Appl Microbiol 2021; 44:126218. 🇪🇸
  • 🧍 The phylogenetic position of this species was determined in a genome-scale analysis by Hördt et al. (2020). Publication: Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪

Parent taxon: Tritonibacter Klotz et al. 2018

Assigned by: Klotz F, Brinkhoff T, Freese HM, Wietz M, Teske A, Simon M, Giebel HA. Tritonibacter horizontis gen. nov., sp. nov., a member of the Rhodobacteraceae, isolated from the Deepwater Horizon oil spill. Int J Syst Evol Microbiol 2018; 68:736-744. 🇩🇪

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Record number: 796365