Taxonomic note on the family Pseudonocardiaceae based on phylogenomic analysis and descriptions of Allosaccharopolyspora gen. nov. and Halosaccharopolyspora gen. nov
The taxonomic positions of members within the family
Pseudonocardiaceae
were assessed based on phylogenomic trees reconstructed using core-proteome and genome blast distance phylogeny approaches. The closely clustered genome sequences from the type strains of validly published names within the family
Pseudonocardiaceae
were analysed using overall genome-related indices based on average nucleotide identity, average amino acid identity and digital DNA–DNA hybridization values. The family
Pseudonocardiaceae
consists of the type genus
Pseudonocardia
, as well as the genera
Actinoalloteichus
,
Actinocrispum
,
Actinokineospora
,
Actinomycetospora
,
Actinophytocola
,
Actinopolyspora
,
Actinorectispora
,
Actinosynnema
,
Allokutzneria
, Allosaccharopolyspora gen. nov.,
Amycolatopsis
,
Bounagaea
,
Crossiella
,
Gandjariella
,
Goodfellowiella
,
Haloactinomyces
,
Haloechinothrix
,
Halopolyspora
, Halosaccharopolyspora gen. nov.,
Herbihabitans
,
Kibdelosporangium
,
Kutzneria
,
Labedaea
,
Lentzea
,
Longimycelium
,
Prauserella
,
Saccharomonospora
,
Saccharopolyspora
,
Saccharothrix
,
Salinifilum
,
Sciscionella
,
Streptoalloteichus
,
Tamaricihabitans
,
Thermocrispum
,
Thermotunica
and
Umezawaea
. The G+C contents of the
Pseudonocardiaceae
genomes ranged from 66.2 to 74.6 mol% and genome sizes ranged from 3.69 to 12.28 Mbp. Based on the results of phylogenomic analysis, the names Allosaccharopolyspora coralli comb. nov., Halosaccharopolyspora lacisalsi comb. nov. and Actinoalloteichus caeruleus comb. nov. are proposed. This study revealed that
Actinokineospora mzabensis
is a heterotypic synonym of
Actinokineospora spheciospongiae
,
Lentzea deserti
is a heterotypic synonym of
Lentzea atacamensis
,
Prauserella endophytica
is a heterotypic synonym of
Prauserella coralliicola
, and
Prauserella flava
and
Prauserella sediminis
are heterotypic synonyms of
Prauserella salsuginis
. This study addresses the nomenclature conundrums of
Actinoalloteichus cyanogriseus
and
Streptomyces caeruleus
as well as
Micropolyspora internatus
and
Saccharomonospora viridis
.