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Geobacterales  is a recently proposed order comprising members who originally belonged to the well-known family  Geobacteraceae , which is a key group in terrestrial ecosystems involved in biogeochemical cycles and has been widely investigated in bioelectrochemistry and bioenergy fields. Previous studies have illustrated the taxonomic structure of most members in this group based on genomic phylogeny; however, several members are still in a pendent or chaotic taxonomic status owing to the lack of genome sequences. To address this issue, we performed this taxonomic reassignment using currently available genome sequences, along with the description of two novel paddy soil-isolated strains, designated Red51 T  and Red69 T , which are phylogenetically located within this order. Phylogenomic analysis based on 120 ubiquitous single-copy proteins robustly separated the species  Geobacter luticola  from other known genera and placed the genus  Oryzomonas  (fam.  Geobacteraceae ) into the family ‘ Pseudopelobacteraceae ’; thus, a novel genus  Geomobilimonas  is proposed, and the family ‘ Pseudopelobacteraceae ’ was emended. Moreover, genomic comparisons with similarity indexes, including average amino acid identity (AAI), percentage of conserved protein (POCP), and average nucleotide identity (ANI), showed proper thresholds as genera boundaries in this order with values of 70%, 65%, and 74% for AAI, POCP, and ANI, respectively. Based on this, the three species  Geobacter argillaceus ,  Geobacter pelophilus , and  Geobacter chapellei  should be three novel genera, for which the names  Geomobilibacter ,  Geoanaerobacter , and  Pelotalea  are proposed, respectively. In addition, the two novel isolated strains phylogenetically belonged to the genus  Geomonas , family  Geobacteraceae , and shared genomic similarity values higher than those of genera boundaries, but lower than those of species boundaries with each other and their neighbors. Taken together with phenotypic and chemotaxonomic characteristics similar to other  Geomonas  species, these two strains, Red51 T  and Red69 T , represent two novel species in the genus  Geomonas , for which the names  Geomonas azotofigens  sp. nov. and  Geomonas diazotrophica  sp. nov. are proposed, respectively.

frontiers in microbiology

Genome-Based Taxonomic Rearrangement of the Order Geobacterales Including the Description of Geomonas azotofigens sp. nov. and Geomonas diazotrophica sp. nov.