Name: Roseiflexus castenholzii Hanada et al. 2002

Category: Species

Proposed as: sp. nov.

Etymology: cas.ten.hol’zi.i. N.L. gen. masc. n. castenholzii, of Castenholz, named after Richard W. Castenholz, an American microbiologist who notably contributed to our knowledge of thermophilic filamentous phototrophs

Pronunciation, gender: kas-ten-HOL-zi-i, masculine

Type strain: DSM 13941; HLO8; JCM 11240; NBRC 100045

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB041226 Analyse FASTA

Valid publication: Hanada S, Takaichi S, Matsuura K, Nakamura K. Roseiflexus castenholzii gen. nov., sp. nov., a thermophilic, filamentous, photosynthetic bacterium that lacks chlorosomes. Int J Syst Evol Microbiol 2002; 52:187-193.

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 52, part 1 of the IJSEM. Int J Syst Evol Microbiol 2002; 52:293-295.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Emendations:
  • Nouioui et al. 2018 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. Oren A, Garrity GM. List of changes in taxonomic opinion no. 29. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2019; 69:13-32.

• Notes:
  • 🥇 Nomenclatural type of the genus Roseiflexus Hanada et al. 2002. Publication: Hanada S, Takaichi S, Matsuura K, Nakamura K. Roseiflexus castenholzii gen. nov., sp. nov., a thermophilic, filamentous, photosynthetic bacterium that lacks chlorosomes. Int J Syst Evol Microbiol 2002; 52:187-193.
  • 😷 The risk group for Germany has been imported on 2023-10-29. 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 38 times in PubMed until 2025-06-04.

Parent taxon: Roseiflexus Hanada et al. 2002

Assigned by: Hanada S, Takaichi S, Matsuura K, Nakamura K. Roseiflexus castenholzii gen. nov., sp. nov., a thermophilic, filamentous, photosynthetic bacterium that lacks chlorosomes. Int J Syst Evol Microbiol 2002; 52:187-193.

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Record number: 780568