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Hyphomonas , a genus of budding, prosthecate bacteria, are primarily found in the marine environment. Seven type strains, and 35 strains from our collections of  Hyphomonas , isolated from the Pacific Ocean, Atlantic Ocean, Arctic Ocean, South China Sea and the Baltic Sea, were investigated in this study using multilocus sequence analysis (MLSA). The phylogenetic structure of these bacteria was evaluated using the 16S rRNA gene, and five housekeeping genes ( leuA ,  clpA ,  pyrH ,  gatA  and  rpoD ) as well as their concatenated sequences. Our results showed that each housekeeping gene and the concatenated gene sequence all yield a higher taxonomic resolution than the 16S rRNA gene. The 42 strains assorted into 12 groups. Each group represents an independent species, which was confirmed by virtual DNA-DNA hybridization (DDH) estimated from draft genome sequences.  Hyphomonas  MLSA interspecies and intraspecies boundaries ranged from 93.3% to 96.3%, similarity calculated using a combined DDH and MLSA approach. Furthermore, six novel species (groups I, II, III, IV, V and XII) of the genus  Hyphomonas  exist, based on sequence similarities of the MLSA and DDH values. Additionally, we propose that the  leuA  gene (93.0% sequence similarity across our dataset) alone could be used as a fast and practical means for identifying species within  Hyphomonas . Finally,  Hyphomonas ' geographic distribution shows that strains from the same area tend to cluster together as discrete species. This study provides a framework for the discrimination and phylogenetic analysis of the genus  Hyphomonas  for the first time, and will contribute to a more thorough understanding of the biological and ecological roles of this genus.

Multilocus Sequence Analysis for the Assessment of Phylogenetic Diversity and Biogeography in Hyphomonas Bacteria from Diverse Marine Environments