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This organism is emerging as an important contributor to human health and disease. In the oral cavity,\n                      <jats:italic toggle=\"yes\">S. sputigena<\/jats:italic>\n                      contributes to periodontitis and is associated with early childhood caries. Much of our current understanding of the genus\n                      <jats:italic toggle=\"yes\">Selenomonas<\/jats:italic>\n                      and its relation to human health derives from studies of a single species,\n                      <jats:italic toggle=\"yes\">S. sputigena<\/jats:italic>\n                      , and is further limited to the type strain, ATCC 35185. As\n                      <jats:italic toggle=\"yes\">S. sputigena<\/jats:italic>\n                      is emerging as a significant contributor to human health, we sought to characterize the\n                      <jats:italic toggle=\"yes\">S. sputigena<\/jats:italic>\n                      ATCC 33150 strain. Genomic analyses revealed that ATCC 33150, previously described as\n                      <jats:italic toggle=\"yes\">S. sputigena<\/jats:italic>\n                      , is a novel\n                      <jats:italic toggle=\"yes\">Selenomonas<\/jats:italic>\n                      sp., and we propose the name\n                      <jats:italic toggle=\"yes\">Selenomonas lamontii<\/jats:italic>\n                      . Phenotypic comparison to\n                      <jats:italic toggle=\"yes\">S. sputigena<\/jats:italic>\n                      reveals that\n                      <jats:italic toggle=\"yes\">S. lamontii<\/jats:italic>\n                      grows more slowly and to a lower density\n                      <jats:italic toggle=\"yes\">in vitro. S. lamontii<\/jats:italic>\n                      is more motile than\n                      <jats:italic toggle=\"yes\">S. sputigena<\/jats:italic>\n                      and does not form surface-attached biofilms. Re-analysis of existing metagenomic data revealed the consistent presence of ATCC 33150 across all samples, with significantly elevated relative abundance in periodontitis-associated saliva compared to healthy donor controls. Collectively, we have identified ATCC 33150 as a new\n                      <jats:italic toggle=\"yes\">Selenomonas<\/jats:italic>\n                      sp. and conducted one of the first direct comparative studies of traits relevant to colonization and persistence among\n                      <jats:italic toggle=\"yes\">Selenomonas<\/jats:italic>\n                      spp.\n                    <\/jats:p>\n                    <jats:sec>\n                      <jats:title>IMPORTANCE<\/jats:title>\n                      <jats:p>\n                        Recognizing that strain ATCC 33150, historically described as\n                        <jats:italic toggle=\"yes\">Selenomonas sputigena<\/jats:italic>\n                        , is a previously undescribed species has important implications for microbial systematics, physiology, and pathogenesis. Accurate taxonomic assignment underpins all downstream biological interpretation (e.g., comparative genomics, microbiome composition studies, virulence studies, and metabolic modeling). The identification of a novel species, therefore, refines the phylogenetic framework of the genus\n                        <jats:italic toggle=\"yes\">Selenomonas<\/jats:italic>\n                        , enables more precise genotype-phenotype correlations, and may uncover previously unrecognized adaptations relevant to oral biofilm ecology and host interactions. Beyond taxonomy, this discovery strengthens the foundation and rigor of future mechanistic studies and provides context for discrepancies in previous studies involving this strain and ATCC 35185.\n                      <\/jats:p>\n                    <\/jats:sec>\n                  <\/jats:sec>","DOI":"10.1128\/spectrum.00341-26","type":"journal-article","created":{"date-parts":[[2026,6,16]],"date-time":"2026-06-16T13:01:06Z","timestamp":1781614866000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Genomic and phenotypic insights into the novel species\n                    <i>Selenomonas lamontii<\/i>\n                    type strain ATCC 33150, currently described as\n                    <i>Selenomonas sputigena<\/i>"],"prefix":"10.1128","volume":"14","author":[{"given":"Colin G.","family":"Hawkes","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02nkdxk79","id-type":"ROR","asserted-by":"publisher"}],"name":"School of Dentistry, Philips Institute for Oral Health Research, Virginia Commonwealth University","place":["Richmond, USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Blake O.","family":"Carroll","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02nkdxk79","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Microbiology and Immunology, School of Medicine, Virginia Commonwealth University","place":["Richmond, USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aidan D.","family":"Moylan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02nkdxk79","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Microbiology and Immunology, School of Medicine, Virginia Commonwealth University","place":["Richmond, USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Margaret E. 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