selenomonadales selenomonadales the selenomonadales are an order of bacteria within the class negativicutes; unlike most other members of bacillota, they are gram-negative. the phylogeny of this order was initially determined by 16s rrna comparisons. more recently, molecular markers in the form of conserved signature indels (csis) have been found specific for all selenomonadales species. on the basis of these markers, the selenomonadales are inclusive of two distinct families, and are no longer the sole order within the negativicutes. several csis have also been found specific for both families, sporomusaceae and selenomonadceae. samples of bacterial strains within this order have been isolated from the root canals of healthy human teeth. selenomonadales scientific classification domain: bacteria phylum: bacillota class: negativicutes order: selenomonadalesmarchandin et al. 2010 families and genera selenomonadaceae anaerovibrio centipeda "massilibacillus" megamonas mitsuokella pectinatus propionispira quinella schwartzia "selenomastix" selenomonas zymophilus sporomusaceae acetonema anaeroarcus anaeromusa anaerosinus anaerospora anaerosporomusa dendrosporobacter desulfosporomusa lucifera methylomusa pelorhabdus pelosinus propionispora psychrosinus sporolituus sporomusa thermosinus synonyms "sporomusales" cavalier-smith 2006 phylogeny the currently accepted taxonomy is based on the list of prokaryotic names with standing in nomenclature (lpsn) and national center for biotechnology information (ncbi) 16s rrna based ltp_01_2022 gtdb 07-rs207 by genome taxonomy database anaeromusa anaeroarcus sporomusaceae anaerosporomusa acetonema pelosinus methylomusa sporomusa lucifera sporolituus thermosinus propionispora anaerospora dendrosporobacter anaerosinus strömpl et al. 1999 veillonellaceae selenomonadaceae propionispira megamonas pectinatus selenomonas lacticifex schleifer et al. 1990 selenomastix selenomonas species-group 2 mitsuokella anaerovibrio schwartzia selenomonas centipeda sporomusales_a "acetonemaceae" anaerosporomusa choi et al. 2016 acetonema kane and breznak 1992 "sporomusales" uppp01 lucifera sanchez-andrea et al. 2018 "thermosinaceae" anaerospora woo et al. 2005 sporolituus ogg and patel 2009 thermosinus sokolova et al. 2004 sporomusaceae methylomusa amano et al. 2018 sporomusa möller et al. 1985 "anaeromusales" "anaeromusaceae" anaeromusa baena et al. 1999 (incl. anaeroarcus strömpl et al. 1999) umgs1260 umgs1260 pelorhabdus grässle et al. 2022 "propionisporales" "propionisporaceae" propionispora biebl et al. 2001 pelosinus shelobolina et al. 2007 "dendrosporobacterales" "dendrosporobacteraceae" dendrosporobacter strömpl et al. 2000 selenomonadales "massilibacillaceae" "massilibacillus" tidjani alou et al. 2017 selenomonadaceae propionispira schink et al. 1983 megamonas shah and collins 1983 pectinatus lee et al. 1978 schwartzia gylswyk et al. 1997 selenomonas von prowazek 1913 anaerovibrio hungate 1966 quinella krumholz et al. 1993 centipeda lai et al. 1983 selenomonas species-group 2 selenomastix woodcock & lapage 1913 mitsuokella shah & collins 1983