Six Gram-stain-negative, catalase- and oxidase-positive, rod-shaped and motile strains (FT81WT, FT82W, FT107W, FT3ST, LX20WT and LX47WT) sharing high 16S rRNA gene sequence similarities with species of the genera
Janthinobacterium
(97.0–98.3 %),
Duganella
(96.3–98.8 %),
Rugamonas
(97.8–98.6 %),
Pseudoduganella
(96.8–97.5 %) and
Massilia
(94.5–98.6 %) were isolated from subtropical streams in PR China. The phylogenetic trees reconstructed using the 16S rRNA gene sequences indicated that the species of above five genera often mix together, indicating that the taxonomic statuses of some species were questionable. Phylogenomic reconstruction based on 369 single-copy orthologous clusters indicated that the species of the genus
Janthinobacterium
form a distinct cluster, strains FT81WT, FT82W and FT107W form a tight cluster with the species of the genus
Duganella
, and strains FT3ST, LX20WT and LX47WT form a tight cluster with the species of genus
Rugamonas
, and the species of genus
Pseudoduganella
form a tight cluster with
Massilia guangdongensis
,
Massilia ginsengisoli
,
Massilia rivuli
,
Massilia namucuonensis
,
Massilia aquatica
sensu Lu et al.,
Massilia buxea
,
Massilia armeniaca
,
Massilia plicata
,
Massilia flava
,
Massilia lurida
,
Massilia dura
,
Massilia lutea
,
Massilia umbonata
,
Massilia albidiflava
and
Massilia violacea
. It should be noted that
Massilia aquatica
Lu et al. 2020 non
Massilia aquatica
Holochová et al. 2020 is a later homonym and an illegitimate name. The GTDB Release 202 also supported the proposal that
M. guangdongensis
,
M. ginsengisoli
,
M. rivuli
,
M. namucuonensis
,
M. aquatica
sensu Lu et al.,
M. buxea
,
M. armeniaca
,
M. plicata
,
M. flava
,
M. lurida
,
M. dura
,
M. lutea
,
M. umbonata
,
M. albidiflava
and
M. violacea
should be transferred into the genus
Pseudoduganella
. The calculated pairwise orthologous average nucleotide identity by usearch (OrthoANIu) values were between 95.0 % and 95.6 % among strains FT81WT, FT82W and FT107W, but were less than 91.5 % among strains FT3ST, LX20WT, LX47WT and other related strains. Combining the results of phylogenomic analyses, phenotypic, biochemical and genotypic characteristics, strains FT81WT, FT82W and FT107W should represent a novel species of the genus
Duganella
, and strains FT3ST, LX20WT and LX47WT should represent three novel species of the genus
Rugamonas
, for which the names Duganella vulcania sp. nov. (type strain FT81WT=GDMCC 1.1679T =KACC 21471T), Rugamonas fusca sp. nov. (type strain FT3ST=GDMCC 1.1907T =KACC 21952T), Rugamonas brunnea sp. nov. (type strain LX20WT=GDMCC 1.1911T =KACC 21956T) and Rugamonas apoptosis sp. nov. (type strain LX47WT=GDMCC 1.1914T =KACC 21959T) are proposed.