Name: "Candidatus Willemsiella" Van Lill et al. 2026
Etymology: Wil.lem.si.el’la. N.L. fem. dim. n. Willemsiella, named in honour of Prof Anne Willems of Ghent University (Belgium) for her contribution to understanding the taxonomy and ecology of agrobacteria and rhizobia
Gender: feminine (stem: Willemsiell-)
Type species: "Candidatus Willemsiella denitrificans" (Siddiqi et al. 2025) Van Lill et al. 2026
Original publication:
van Lill M, Steenkamp ET, Palmer M, Beukes CW, Venter SN. Using the SeqCode to validate the names of reclassified lineages of rhizobia and agrobacteria. Syst Appl Microbiol 2026; 49:126720. 
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Nomenclatural status: not validly published
Nomenclatural pro-status: not pro-validly published
Taxonomic status: synonym (and no pro-standing)
Correct name: Mesorhizobium Jarvis et al. 1997
| Name | Kind |
|---|---|
| Mesorhizobium Jarvis et al. 1997 | heterotypic synonym, validly published under the ICNP |
| Allomesorhizobium Li et al. 2025 | heterotypic synonym, validly published under the ICNP |
| Neomesorhizobium Li et al. 2025 | heterotypic synonym, validly published under the ICNP |
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Number of child taxa with a validly published and correct name: 0
Number of child taxa with a validly published name, including synonyms: 0
Total number of child taxa: 1
| Name | Nomenclatural status | Taxonomic status |
|---|---|---|
| "Candidatus Willemsiella denitrificans" (Siddiqi et al. 2025) Van Lill et al. 2026 | not validly published | synonym |
Parent taxon: Bartonellaceae Gieszczykiewicz 1939 (Approved Lists 1980)
Assigned by:
van Lill M, Steenkamp ET, Palmer M, Beukes CW, Venter SN. Using the SeqCode to validate the names of reclassified lineages of rhizobia and agrobacteria. Syst Appl Microbiol 2026; 49:126720. 🇿🇦
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