Saccharibacter
floricola

Saccharococcus
thermophilus

Saccharomonospora
azurea - caesia - cyanea - glauca - halophila - paurometabolica - sp. - viridis - xinjiangensis

Saccharophagus
degradans

Saccharopolyspora
erythraea - filipina - flava - gregorii - halophila - hirsuta - hordei - rectivirgula - spinosa - spinosporotrichia - taberi - thermophila

Saccharothrix
algeriensis - australiensis - coeruleofusca - espanaensis - longispora - mutabilis - syringae - tangerinus - texasensis - xinjiangensis

Sagittula
stellata

Salana
multivorans

Salegentibacter
salegens

Salinibacter
ruber

Salinibacterium
amurskyense

Salinicoccus
hispanicus - roseus

Salinimonas
chungwhensis

Salinispora
arenicola - tropica

Salinivibrio
costicola

Salipiger
mucosus

Salmonella
bongori - enterica - subterranea

Samsonia
erythrinae

Sanguibacter
keddieii - suarezii

Saprospira
grandis

Sarcina
maxima - sp. - ventriculi

Sarraceniospora
aurea

Scardovia
inopinata

Schlegelella
thermodepolymerans

Schwartzia
succinivorans

Sedimentibacter
hydroxybenzoicus - saalensis

Sedimenticola
selenatireducens

Segniliparus
rotundus - rugosus

Seinonella
peptonophila

Sejongia
antarctica - jeonii

Selenomonas
lacticifex - ruminantium - sp. - sputigena

Serinicoccus
marinus

Serratia
entomophila - ficaria - fonticola - grimesii - liquefaciens - marcescens - odorifera - plymuthica - proteamaculans - quinivorans - rubidaea - ureilytica

Shewanella
abyssi - algae - baltica - benthica - colwelliana - denitrificans - fidelis - frigidimarina - gaetbuli - gelidimarina - halifaxensis - hanedai - japonica - kaireitica - loihica - pacifica - profunda - putrefaciens - sediminis - surugensis - woodyi

Shigella
boydii - flexneri - sonnei

Shinella
zoogloeoides

Shuttleworthia
satelles

Silanimonas
lenta

Silicibacter
lacuscaerulensis - pomeroyi

Silvimonas
terrae

Simonsiella
muelleri

Simplicispira
metamorpha - psychrophila

Sinococcus
qinghaiensis

Sinorhizobium
americanum - sp.

Skermania
piniformis

Slackia
faecicanis - heliotrinireducens

Smaragdicoccus
niigatensis

Smithella
propionica

Sodalis
glossinidius

Soehngenia
saccharolytica

Sorangium
cellulosum

Sphaerobacter
thermophilus

Sphaerosporangium
'rubeum' - melleum

Sphaerotilus
natans

Sphingobacterium
faecium - mizutaii - multivorum - sp. - spiritivorum - thalpophilum

Sphingobium
amiense - aromaticiconvertens - chlorophenolicum - chungbukense - cloacae - fuliginis - herbicidovorans - indicum - japonicum - xenophagum - yanoikuyae

Sphingomonas
abaci - adhaesiva - aerolata - aquatilis - asaccharolytica - aurantiaca - azotifigens - echinoides - faeni - koreensis - mali - melonis - oligophenolica - panni - parapaucimobilis - paucimobilis - phyllosphaerae - pituitosa - pruni - sanguinis - soli - sp. - suberifaciens - trueperi - wittichii - yabuuchiae - yunnanensis

Sphingopyxis
alaskensis - baekryungensis - chilensis - flavimaris - macrogoltabida - taejonensis - terrae - witflariensis

Sphingosinicella
xenopeptidilytica

Spirilliplanes
yamanashiensis

Spirillospora
albida

Spirillum
sp.

Spirochaeta
africana - alkalica - asiatica - aurantia - bajacaliforniensis - caldaria - coccoides - halophila - isovalerica - litoralis - smaragdinae - sp. - stenostrepta - thermophila - zuelzerae

Spirosoma
linguale

Sporacetigenium
mesophilum

Sporanaerobacter
acetigenes

Sporichthya
brevicatena - polymorpha

Sporobacter
termitidis

Sporobacterium
olearium

Sporocytophaga
myxococcoides

Sporohalobacter
lortetii

Sporolactobacillus
inulinus - kofuensis - laevolacticus - nakayamae - terrae

Sporomusa
acidovorans - aerivorans - malonica - ovata - paucivorans - silvacetica - sp. - sphaeroides - termitida

Sporosarcina
aquimarina - globispora - macmurdoensis - pasteurii - psychrophila - ureae

Sporotalea
propionica

Sporotomaculum
hydroxybenzoicum - syntrophicum

Stackebrandtia
flavoalba - nassauensis

Staleya
guttiformis

Staphylococcus
arlettae - aureus - auricularis - capitis - caprae - carnosus - chromogenes - cohnii - condimenti - delphini - epidermidis - equorum - felis - fleurettii - gallinarum - haemolyticus - hominis - hyicus - intermedius - kloosii - lentus - lugdunensis - lutrae - muscae - nepalensis - pasteuri - piscifermentans - pulvereri - saccharolyticus - saprophyticus - schleiferi - sciuri - simiae - simulans - sp. - succinus - vitulinus - warneri - xylosus

Staphylothermus
hellenicus - marinus

Stappia
aggregata - alba - marina - stellulata

Starkeya
novella

Stella
humosa - vacuolata

Stenotrophomonas
acidaminiphila - koreensis - maltophilia - nitritireducens - rhizophila

Sterolibacterium
denitrificans

Stetteria
hydrogenophila

Stigmatella
aurantiaca - erecta - hybrida

Streptacidiphilus
albus - carbonis - griseisporus - luteoalbus - neutrinimicus - sp.

Streptoalloteichus
hindustanus

Streptobacillus
moniliformis

Streptococcus
acidominimus - agalactiae - alactolyticus - anginosus - australis - bovis - canis - castoreus - constellatus - criceti - cristatus - didelphis - downei - dysgalactiae - entericus - equi - equinus - ferus - gallinaceus - gallolyticus - gordonii - halichoeri - hyointestinalis - hyovaginalis - infantis - iniae - intermedius - lutetiensis - macacae - marimammalium - massiliensis - minor - mitis - mutans - oralis - orisratti - ovis - parasanguinis - parauberis - peroris - phocae - pleomorphus - pluranimalium - pneumoniae - porcinus - pseudopneumoniae - pyogenes - ratti - salivarius - sanguinis - sinensis - sobrinus - sp. - suis - thermophilus - thoraltensis - uberis - urinalis - vestibularis

Streptomonospora
alba - salina - sp.

Streptomyces
abikoensis - aburaviensis - achromogenes - acidiscabies - acrimycini - aculeolatus - afghaniensis - africanus - alanosinicus - albaduncus - albiaxialis - albidochromogenes - albidoflavus - albofaciens - alboflavus - albogriseolus - albolongus - alboniger - albospinus - albosporeus - albovinaceus - alboviridis - albulus - albus - alcalophilus - almquistii - althioticus - amakusaensis - ambofaciens - anandii - anthocyanicus - antibioticus - antimycoticus - anulatus - arabicus - ardus - arenae - armeniacus - asiaticus - asterosporus - atratus - atroaurantiacus - atroolivaceus - atrovirens - aurantiacus - aurantiogriseus - auratus - aureocirculatus - aureofaciens - aureorectus - aureoverticillatus - aureus - avellaneus - avermitilis - avidinii - azureus - baarnensis - bacillaris - badius - bambergiensis - bangladeshiensis - beijiangensis - bellus - bikiniensis - blastmyceticus - bluensis - bobili - bottropensis - brasiliensis - bungoensis - cacaoi - caelestis - caeruleus - californicus - calvus - canarius - candidus - canescens - cangkringensis - caniferus - canus - capillispiralis - capoamus - carpaticus - carpinensis - catenulae - cavourensis - cebimarensis - cellostaticus - celluloflavus - cellulosae - champavatii - chartreusis - chattanoogensis - cheonanensis - chrestomyceticus - chromofuscus - chryseus - chrysomallus - chungwhensis - cinereorectus - cinereoruber - cinereospinus - cinereus - cinerochromogenes - cinnabarinus - cinnamonensis - cinnamoneus - cirratus - ciscaucasicus - clavifer - clavuligerus - coelescens - coelicoflavus - coelicolor - coeruleofuscus - coeruleoprunus - coeruleorubidus - coerulescens - collinus - corchorusii - costaricanus - cremeus - crystallinus - curacoi - cuspidosporus - cyaneofuscatus - cyaneus - cyanoalbus - daghestanicus - diastaticus - diastatochromogenes - djakartensis - drozdowiczii - durhamensis - durmitorensis - echinatus - echinoruber - ederensis - endus - enissocaesilis - erumpens - erythrogriseus - eurocidicus - europaeiscabiei - eurythermus - exfoliatus - felleus - ferralitis - filamentosus - filipinensis - fimbriatus - fimicarius - finlayi - flaveolus - flaveus - flavidofuscus - flavidovirens - flavofungini - flavofuscus - flavogriseus - flavotricini - flavovariabilis - flavovirens - flavoviridis - flocculus - floridae - fluorescens - fradiae - fragilis - fulvissimus - fulvorobeus - fumanus - fumigatiscleroticus - galbus - galilaeus - gancidicus - garden - gardneri - gelaticus - geldanamycininus - geysiriensis - ghanaensis - gibsonii - ginsengisoli - glaucescens - glauciniger - glaucosporus - glaucus - globisporus - globosus - glomeratus - glomeroaurantiacus - gobitricini - goshikiensis - gougerotii - graminearus - graminofaciens - griseiniger - griseinus - griseoaurantiacus - griseobrunneus - griseocarneus - griseochromogenes - griseoflavus - griseofuscus - griseoincarnatus - griseoloalbus - griseolus - griseoluteus - griseomycini - griseoplanus - griseorubens - griseoruber - griseorubiginosus - griseosporeus - griseostramineus - griseoverticillatus - griseoviridis - griseus - halotolerans - halstedii - hawaiiensis - hebeiensis - heliomycini - helvaticus - herbaricolor - himgriensis - hiroshimensis - hirsutus - humidus - humiferus - hydrogenans - hygroscopicus - iakyrus - indiaensis - indigoferus - indonesiensis - intermedius - inusitatus - ipomoeae - janthinus - javensis - jietaisiensis - kanamyceticus - kasugaensis - katrae - koyangensis - kunmingensis - kurssanovii - labedae - laceyi - lanatus - lateritius - laurentii - lavendofoliae - lavendulae - lavenduligriseus - lavendulocolor - levis - libani - lienomycini - lilacinus - limosus - lincolnensis - lipmanii - litmocidini - lomondensis - longisporoflavus - longispororuber - longisporus - longwoodensis - lucensis - lunalinharensis - luridus - lusitanus - luteireticuli - luteogriseus - luteosporeus - lydicus - macrosporus - malachitofuscus - malachitospinus - malaysiensis - maritimus - mashuensis - massasporeus - matensis - mauvecolor - mediolani - megasporus - melanogenes - melanosporofaciens - mentougouensis - mexicanus - michiganensis - microflavus - minutiscleroticus - mirabilis - misakiensis - misionensis - mobaraensis - monomycini - morookaense - murinus - mutabilis - mutomycini - naganishii - nanningensis - narbonensis - nashvillensis - netropsis - neyagawaensis - niger - nigrescens - nitrosporeus - niveoruber - noboritoensis - nodosus - nogalater - nojiriensis - noursei - novaecaesareae - ochraceiscleroticus - odorifer - olivaceiscleroticus - olivaceoviridis - olivaceus - olivochromogenes - olivoverticillatus - olivoviridis - omiyaensis - orinoci - pactum - panacagri - panaciterrae - paradoxus - parvulus - parvus - peucetius - phaeochromogenes - phaeofaciens - phaeoluteichromatogenes - phaeoluteigriseus - phaeopurpureus - phaeoviridis - pharetrae - phemorphus - pilosus - platensis - plicatus - pluricolorescens - polyantibioticus - polychromogenes - poonensis - praecox - prasinopilosus - prasinosporus - prasinus - prunicolor - psammoticus - pseudoechinosporeus - pseudogriseolus - pseudovenezuelae - pulveraceus - puniceus - purpeofuscus - purpurascens - purpureus - purpurogeneiscleroticus - racemochromogenes - rameus - ramulosus - rangoonensis - recifensis - rectiviolaceus - regensis - resistomycificus - reticuliscabiei - rhizosphaericus - rimosus - rishiriensis - rochei - roseiscleroticus - roseoalbus - roseodiastaticus - roseoflavus - roseofulvus - roseolilacinus - roseolus - roseosporus - roseoverticillatus - roseoviolaceus - roseoviridis - ruber - rubiginosohelvolus - rubiginosus - rubrogriseus - rutgersensis - salinarum - sampsonii - sanglieri - sannanensis - sannurensis - scabiei - scabrisporus - sclerotialus - seoulensis - serianimatus - showdoensis - sindenensis - sioyaensis - sodiiphilus - somaliensis - sp. - sparsogenes - sparsus - spectabilis - speibonae - spinoverrucosus - spiralis - spiroverticillatus - sporocinereus - sporoclivatus - spororaveus - sporoverrucosus - stelliscabiei - stramineus - subrutilus - sulfonofaciens - sulphureus - tanashiensis - tauricus - tendae - termitum - thermoalcalitolerans - thermocarboxydovorans - thermocarboxydus - thermocoprophilus - thermodiastaticus - thermogriseus - thermolineatus - thermospinosisporus - thermoviolaceus - thermovulgaris - thioluteus - torulosus - toxytricini - tricolor - tritolerans - tubercidicus - tuirus - turgidiscabies - umbrinus - variabilis - variegatus - varsoviensis - vastus - venezuelae - vinaceus - vinaceusdrappus - violaceochromogenes - violaceolatus - violaceorectus - violaceoruber - violaceorubidus - violaceus - violaceusniger - violarus - violascens - violens - virens - virginiae - viridiflavus - viridiviolaceus - viridobrunneus - viridochromogenes - viridodiastaticus - viridosporus - vitaminophilus - wedmorensis - werraensis - willmorei - xanthochromogenes - xanthocidicus - xantholiticus - xanthophaeus - yanii - yatensis - yeochonensis - yerevanensis - yogyakartensis - yokosukanensis - yunnanensis - zaomyceticus

Streptomycetoides
hainanensis

Streptosporangium
album - amethystogenes - aureofuscum - brasiliense - cinnabarinum - claviforme - fragile - griseoalbum - koreanum - kunmingense - longisporum - nondiastaticum - pseudovulgare - purpuratum - roseum - rubrum - sibiricum - sp. - subroseum - violaceochromogenes - viridialbum - vulgare - yunnanense

Stygiolobus
azoricus

Subdoligranulum
variabile

Subtercola
boreus - frigoramans

Succiniclasticum
ruminis

Succinimonas
amylolytica

Succinispira
mobilis

Succinivibrio
dextrinosolvens

Sulfitobacter
brevis - mediterraneus - pontiacus

Sulfobacillus
acidophilus - sibiricus - thermosulfidooxidans - thermotolerans

Sulfolobus
acidocaldarius - metallicus - shibatae - solfataricus - tokodaii

Sulfophobococcus
zilligii

Sulfuricurvum
kujiense

Sulfurihydrogenibium
azorense - subterraneum

Sulfurimonas
autotrophica - denitrificans - paralvinellae

Sulfurisphaera
ohwakuensis

Sulfurospirillum
arcachonense - arsenophilum - barnesii - deleyianum - halorespirans - multivorans - sp.

Sutterella
stercoricanis - wadsworthensis

Suttonella
indologenes - ornithocola

Syntrophobacter
fumaroxidans - pfennigii - sulfatireducens - wolinii

Syntrophobotulus
glycolicus

Syntrophococcus
sucromutans

Syntrophomonas
bryantii - curvata - erecta - sapovorans - wolfei

Syntrophothermus
lipocalidus

Syntrophus
buswellii - gentianae