Tannerella
forsythensis

Tatlockia
maceachernii - micdadei

Tatumella
ptyseos

Taylorella
equigenitalis

Tea
fungus

Teichococcus
ludipueritiae

Telluria
chitinolytica - mixta

Tenacibaculum
amylolyticum - lutimaris - maritimum - mesophilum - ovolyticum - skagerrakense

Tepidanaerobacter
syntrophicus

Tepidibacter
formicigenes - thalassicus

Tepidimicrobium
ferriphilum

Tepidimonas
aquatica - ignava

Tepidiphilus
margaritifer

Terasakiella
pusilla

Terrabacter
terrae - tumescens

Terracoccus
luteus

Terrimonas
ferruginea

Tessaracoccus
bendigoensis

Tetragenococcus
halophilus - koreensis - muriaticus - solitarius

Tetrasphaera
australiensis - duodecadis - elongata - japonica - jenkinsii - vanveenii - veronensis

Tetrathiobacter
kashmirensis

Thalassobacillus
devorans

Thalassobius
gelatinovorus

Thalassolituus
oleivorans

Thalassomonas
ganghwensis - loyana - viridans

Thalassospira
lucentensis - profundimaris - xiamenensis

Thauera
aminoaromatica - aromatica - chlorobenzoica - linaloolentis - mechernichensis - phenylacetica - pivalivorans - terpenica - vanillica

Thermacetogenium
phaeum

Thermaerobacter
marianensis - nagasakiensis

Thermanaeromonas
toyohensis

Thermanaerovibrio
acidaminovorans - velox

Thermicanus
aegyptius

Thermincola
carboxydiphila

Thermithiobacillus
tepidarius

Thermoactinomyces
candidus - dichotomicus - intermedius - putidus - sacchari - sp. - thalpophilus - vulgaris

Thermoactinopolyspora
coremialis

Thermoanaerobacter
acetoethylicus - brockii - cellulolyticus - ethanolicus - italicus - kivui - mathranii - siderophilus - sulfurophilus - thermohydrosulfuricus - wiegelii

Thermoanaerobacterium
aciditolerans - aotearoense - polysaccharolyticum - saccharolyticum - sp. - thermosaccharolyticum - thermosulfurigenes - xylanolyticum - zeae

Thermoanaerobium
crenophilum - lactoethylicum - olidum

Thermobifida
alba - cellulosilytica - fusca

Thermobispora
bispora

Thermobrachium
celere

Thermochromatium
tepidum

Thermococcus
acidaminovorans - aegaeus - aggregans - alcaliphilus - atlanticus - barophilus - celer - chitonophagus - fumicolans - gammatolerans - gorgonarius - guaymasensis - litoralis - pacificus - peptonophilus - profundus - sibiricus - siculi - stetteri - waiotapuensis - zilligii

Thermocrinis
albus - ruber

Thermocrispum
agreste - municipale

Thermodesulfatator
indicus

Thermodesulfobacterium
commune - hveragerdense - hydrogeniphilum - mobile - sp. - thermophilum

Thermodesulfobium
narugense

Thermodesulforhabdus
norvegica

Thermodesulfovibrio
islandicus - yellowstonii

Thermofilum
librum - pendens

Thermoflavimicrobium
dichotomicum

Thermohydrogenium
kirishiense

Thermoleophilum
album - minutum

Thermomicrobium
roseum

Thermomonas
brevis - fusca - haemolytica - hydrothermalis

Thermomonospora
chromogena - curvata - mesophila - mesouviformis - sp.

Thermonema
lapsum - rossianum

Thermoplasma
acidophilum - volcanium

Thermopolyspora
flexuosa

Thermoproteus
neutrophilus - tenax - uzoniensis

Thermosediminibacter
litoriperuensis - oceani

Thermosinus
carboxydivorans

Thermosipho
africanus - atlanticus - japonicus - melanesiensis - sp.

Thermosphaera
aggregans

Thermosyntropha
lipolytica

Thermotoga
elfii - hypogea - lettingae - maritima - naphthophila - neapolitana - petrophila - sp. - subterranea - thermarum

Thermovenabulum
ferriorganovorum

Thermovibrio
ammonificans - ruber

Thermovirga
lienii

Thermus
antranikianii - aquaticus - brockianus - filiformis - igniterrae - oshimai - scotoductus - sp. - thermophilus

Thetysia
sp.

Thialkalimicrobium
aerophilum - sibiricum

Thialkalivibrio
denitrificans - nitratis

Thioalkalimicrobium
aerophilum - cyclicum - sibiricum

Thioalkalivibrio
denitrificans - halophilus - jannaschii - nitratis - paradoxus - sp. - thiocyanoxidans - versutus

Thioalkalovibrio
sp.

Thiobaca
trueperi

Thiobacillus
aquaesulis - concretivorus - denitrificans - organoparus - plumbophilus - prosperus - sp. - thioparus

Thiobacter
subterraneus

Thiocapsa
marina - pendens - rosea - roseopersicina

Thiococcus
pfennigii

Thiocystis
gelatinosa - violacea - violascens

Thiodictyon
bacillosum - elegans

Thiohalocapsa
halophila

Thiolamprovum
pedioforme

Thiomicrospira
arctica - chilensis - crunogena - frisia - halophila - kuenenii - pelophila - psychrophila - sp. - thermophila - thyasirae

Thiomonas
arsenivorans - cuprina - delicata - intermedia - perometabolis

Thioreductor
micantisoli

Thiorhodococcus
drewsii - minor

Thiorhodovibrio
winogradskyi

Thiothrix
nivea - sp.

Thorsellia
anophelis

Tibi
grain

Tindallia
magadiensis

Tissierella
creatinini - creatinophila - praeacuta

Tolumonas
auensis

Trabulsiella
guamensis

Treponema
azotonutricium - brennaborense - bryantii - calligyrum - denticola - maltophilum - parvum - phagedenis - primitia - refringens - saccharophilum - sp. - succinifaciens

Trichococcus
collinsii - flocculiformis - palustris - pasteurii - patagoniensis

Trichotomospora
caesia

Truepera
radiovictrix

Tsukamurella
inchonensis - paurometabola - paurometabolum - pseudospumae - pulmonis - sp. - spongiae - spumae - strandjordii - tyrosinosolvens - wratislaviensis

Tuberibacillus
calidus

Turicella
otitidis

Turicibacter
sanguinis