Abstract
Ha.lo.bo'num. Gr. masc. n.
hals
,
halos
salt; L. masc. adj.
bonus
good; N.L. neut. n.
Halobonum
a good salt organism.
The genus
Candidatus
Halobonum with a single proposed species
Candidatus
Halobonum tyrrellense corrig. consists of extremely halophilic members of the haloarchaeal family
Halorubraceae
most closely related to the genus
Halobaculum
. The only isolate known was obtained from hypersaline surface waters of Lake Tyrrell, Victoria, Australia. In spite of the fact that a pure culture was isolated,
Ca
. Halobonum and
Ca
. Halobonum tyrrellense were described as
Candidatus
taxa. No cultures are currently available.
Ca
. Halobonum tyrrellense strain G22 was isolated on medium containing 235 g/l salt and with glycerol as the sole carbon source. Few phenotypic properties were reported. The genome size was estimated at 3,675,087 bp, with a DNA G + C content of 70.1 mol %. A putative sensory rhodopsin and a high number of ABC transporters and carbon metabolism genes were identified in the draft genome. 16S rRNA gene sequences affiliated with
Ca
. Halobonum were recovered from a hypersaline, ephemeral playa at the White Sands National Monument, New Mexico, USA, and from Chinese salt lakes and salterns.
DNA G + C content (mol %)
: 70.1 (genome sequence).
Type species
:
Candidatus
Halobonum tyrrellense.
Taxonomic and Nomenclature Notes
According to the List of Prokaryotic names with Standing in Nomenclature (LPSN), the taxonomic status of the genus
Candidatus Halobonum
is: preferred name (not correct name) (last update, February 2025)
*
.
LPSN classification:
Archaea
/
Methanobacteriati
/
Methanobacteriota
/
Halobacteria
/
Halobacteriales
/
Haloferacaceae
/
Candidatus Halobonum
The genus
Candidatus Halobonum
can also be recovered in the Genome Taxonomy Database (GTDB) as
g__Halobaculum
(version v220)
**
.
GTDB classification:
d__Archaea
/
p__Halobacteriota
/
c__Halobacteria
/
o__Halobacteriales
/
f__Haloferacaceae
/
g__Halobaculum
*
Meier‐Kolthoff
et al. (
2022
).
Nucleic Acids Res
,
50
,
D801
–
D807
; DOI:
10.1093/nar/gkab902
**
Parks
et al. (
2022
).
Nucleic Acids Res
,
50
,
D785
–
D794
; DOI:
10.1093/nar/gkab776