Species Tetrasphaera duodecadis

Name: Tetrasphaera duodecadis (Lochhead 1958) Ishikawa and Yokota 2006

Category, proposed as: species, comb. nov.

Basonym: Arthrobacter duodecadis Lochhead 1958 (Approved Lists 1980)

Etymology: du.o.de’ca.dis. L. fem. n. duodecas, the number twelve; L. gen. fem. n. duodecadis, of twelve, referring to the requirement of the organism for vitamin B12

Pronunciation (Latin), gender: te-tra-SP^HA͡E-ra du-o-DE-ka-dis, feminine

Type strain: ATCC 13347; CIP 102696; DSM 12806; IAM 14868; IFO 12959; JCM 11564; LMG 17308; NBRC 12959; NCIB 9222; NCIMB 9222; VKM Ac-1108

Conduct genome-based taxonomy at

16S rRNA gene: AB072496 Analyse FASTA

Valid publication: Ishikawa T, Yokota A. Reclassification of Arthrobacter duodecadis Lochhead 1958 as Tetrasphaera duodecadis comb. nov. and emended description of the genus Tetrasphaera. Int J Syst Evol Microbiol 2006; 56:1369-1373. 🇯🇵

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 56, part 6 of the IJSEM. Int J Syst Evol Microbiol 2006; 56:2029-2030.

Nomenclatural status: validly published under the ICNP, illegitimate name

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Phycicoccus duodecadis (Lochhead 1958) Nouioui et al. 2018

Risk group: 1

• Synonyms:

  • Name	Kind
    Arthrobacter duodecadis Lochhead 1958 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    Phycicoccus duodecadis (Lochhead 1958) Nouioui et al. 2018	homotypic synonym, validly published under the ICNP

• Notes:
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — 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 2 times in PubMed until 2026-06-11.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded risk group of the genus.
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Nouioui I, Carro L, Garcia-Lopez M, Meier-Kolthoff JP, Woyke T, Kyrpides NC, Pukall R, Klenk HP, Goodfellow M, Goker M. Genome-Based Taxonomic Classification of the Phylum Actinobacteria. Front Microbiol 2018; 9:2007. 🇩🇪

Parent taxon: Tetrasphaera Maszenan et al. 2000

Assigned by: Ishikawa T, Yokota A. Reclassification of Arthrobacter duodecadis Lochhead 1958 as Tetrasphaera duodecadis comb. nov. and emended description of the genus Tetrasphaera. Int J Syst Evol Microbiol 2006; 56:1369-1373. 🇯🇵

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Record number: 782435