Paenibacillus
agarexedens - agaridevorans - alginolyticus - alkaliterrae - alvei - amylolyticus - anaericanus - antarcticus - apiarius - assamensis - azoreducens - azotofixans - barcinonensis - borealis - brasilensis - chibensis - chinjuensis - chitinolyticus - chondroitinus - cineris - cookii - curdlanolyticus - daejeonensis - dendritiformis - durus - ehimensis - favisporus - gansuensis - glucanolyticus - glycanilyticus - graminis - hongkongensis - illinoisensis - jamilae - kobensis - lactis - larvae - lautus - lentimorbus - macerans - macquariensis - massiliensis - mendelii - motobuensis - naphthalenovorans - nematophilus - odorifer - pabuli - peoriae - phyllosphaerae - polymyxa - popilliae - rhizosphaerae - sabinae - sp. - stellifer - terrae - thiaminolyticus - timonensis - turicensis - validus - wynnii - xinjiangensis - xylanilyticus

Palaeococcus
ferrophilus - helgesonii

Palleronia
marisminoris

Paludibacter
propionicigenes

Pandoraea
apista - norimbergensis - pnomenusa - pulmonicola - sputorum

Pannonibacter
phragmitetus

Pantoea
agglomerans - ananatis - citrea - dispersa - punctata - sp. - stewartii - terrea

Papillibacter
cinnamivorans

Parabacteroides
distasonis - johnsonii

Paracoccus
alcaliphilus - alkenifer - aminophilus - aminovorans - denitrificans - kocurii - kondratievae - pantotrophus - seriniphilus - solventivorans - sp. - thiocyanatus - versutus - zeaxanthinifaciens

Paracoli
sp.

Paracraurococcus
ruber

Paralactobacillus
selangorensis

Paraliobacillus
ryukyuensis

Parascardovia
denticolens

Parasporobacterium
paucivorans

Parvibaculum
lavamentivorans

Parvimonas
micra

Parvopolyspora
pallida

Pasteurella
aerogenes - bettyae - caballi - canis - dagmatis - langaaensis - lymphangitidis - mairii - multocida - pneumotropica - skyensis - SP - sp. - stomatis - testudinis - trehalosi

Patulibacter
minatonensis

Paucibacter
toxinivorans

Paucimonas
lemoignei

Paucisalibacillus
globulus

Pectinatus
cerevisiiphilus - frisingensis - haikarae - sp.

Pectobacterium
atrosepticum - betavasculorum - cacticida - carotovorum - cypripedii - wasabiae

Pediococcus
acidilactici - cellicola - claussenii - damnosus - dextrinicus - inopinatus - parvulus - pentosaceus - sp. - stilesii - urinaeequi

Pedobacter
africanus - caeni - cryoconitis - heparinus - piscium - saltans - sp.

Pelistega
europaea

Pelobacter
acetylenicus - acidigallici - carbinolicus - massiliensis - propionicus - sp. - venetianus

Pelodictyon
phaeum

Pelomonas
saccharophila

Pelosinus
fermentans

Pelospora
glutarica

Pelotomaculum
terephthalicicum - thermopropionicum

Peptococcus
niger

Peptoniphilus
asaccharolyticus - harei - indolicus - ivorii - lacrimalis

Peptostreptococcus
anaerobius - sp. - stomatis

Peredibacter
starrii

Persephonella
guaymasensis - hydrogeniphila - marina

Persicivirga
xylanidelens

Persicobacter
diffluens

Petrimonas
sulfuriphila

Petrobacter
succinatimandens

Petrotoga
halophila - mexicana - miotherma - mobilis - olearia - sibirica

Phaeobacter
gallaeciensis - inhibens

Phaeospirillum
fulvum - molischianum

Phascolarctobacterium
faecium

Phenylobacterium
falsum - immobile - lituiforme

Phocoenobacter
uteri

Photobacterium
angustum - damsela - damselae - halotolerans - iliopiscarium - indicum - leiognathi - lipolyticum - mandapamensis - phosphoreum - profundum - rosenbergii - sp.

Photorhabdus
asymbiotica - luminescens - temperata

Phyllobacterium
catacumbae - myrsinacearum - rubiacearum - trifolii

Picrophilus
oshimae - torridus

Pigmentiphaga
kullae

Pilimelia
anulata - columellifera - terevasa

Pirellula
staleyi

Planctomyces
brasiliensis - limnophilus - maris

Planifilum
fimeticola - fulgidum

Planobispora
longispora - rosea

Planococcus
alkanoclasticus - antarcticus - citreus - kocurii - maitriensis - maritimus - rifietoensis - sp. - stackebrandtii

Planomicrobium
chinense - koreense - mcmeekinii - okeanokoites - psychrophilum

Planomonospora
alba - parontospora - sphaerica - venezuelensis

Planotetraspora
mira - silvatica

Plantibacter
flavus

Pleomorphomonas
oryzae

Plesiocystis
pacifica

Plesiomonas
shigelloides

Polaribacter
dokdonensis - filamentus - franzmannii - glomeratus

Polaromonas
naphthalenivorans

Polyangium
cellulosum - fumosum - sorediatum - sp. - spumosum

Polymorphospora
rubra

Pontibacillus
chungwhensis - marinus

Pontibacter
actiniarum

Porphyrobacter
cryptus - dokdonensis - donghaensis - neustonensis - sanguineus - sp. - tepidarius

Porphyromonas
asaccharolytica - canoris - gingivalis - gulae - macacae

Pragia
fontium

Prauserella
alba - halophila - rugosa

Prevotella
albensis - baroniae - bergensis - bivia - bryantii - buccae - buccalis - corporis - dentalis - denticola - disiens - enoeca - intermedia - marshii - melaninogenica - multiformis - multisaccharivorax - nigrescens - oralis - oris - oulora - pallens - salivae - shahii - sp. - zoogleoformans

Proactinomyces
roseus

Prolinoborus
fasciculus

Promicromonospora
aerolata - citrea - pachnodae - sp. - sukumoe - vindobonensis

Promyxobacterium
flavum

Propionibacterium
acidipropionici - acnes - australiense - avidum - cyclohexanicum - freudenreichii - granulosum - intermedium - jensenii - lymphophilum - microaerophilum - propionicum - propionicus - sp. - thoenii

Propionicimonas
paludicola

Propioniferax
innocua

Propionigenium
maris - modestum

Propionimicrobium
lymphophilum

Propionispira
arboris

Propionispora
hippei - vibrioides

Propionivibrio
dicarboxylicus - limicola - pelophilus

Prosthecobacter
debontii - dejongeii - fusiformis - vanneervenii

Prosthecochloris
aestuarii - vibrioformis

Prosthecomicrobium
enhydrum - litoralum - pneumaticum - polyspheroidum

Protaminobacter
thiaminophaga

Proteiniphilum
acetatigenes

Proteus
genomospecies - hauseri - inconstans - mirabilis - myxofaciens - penneri - rettgeri - sp. - vulgaris

Providencia
alcalifaciens - heimbachae - rettgeri - rustigianii - stuartii - vermicola

Pseudaminobacter
salicylatoxidans

Pseudoalteromonas
agarivorans - aliena - antarctica - atlantica - aurantia - bacteriolytica - carrageenovora - citrea - denitrificans - distincta - elyakovii - espeijana - espejiana - flavipulchra - haloplanktis - issachenkonii - luteoviolacea - maricaloris - mariniglutinosa - nigrifaciens - paragorgicola - peptidolytica - piscicida - prydzensis - rubra - ruthenica - sp. - tetraodonis - translucida - tunicata - ulvae - undina - undinda

Pseudoaminobacter
defluvii

Pseudobutyrivibrio
ruminis - xylanivorans

Pseudoclavibacter
helvolus - sp.

Pseudomonas
abietaniphila - aeruginosa - aestumarina - agarici - alcaligenes - alcaliphila - alginovora - amygdali - anguilliseptica - antarctica - antimicrobica - antimycetica - argentinensis - aromatica - asplenii - atlantica - aurantiaca - avellanae - azotifigens - azotoformans - azotogensis - balearica - beijerinckii - beteli - borbori - boreopolis - brassicacearum - brenneri - cannabina - carboxydohydrogena - caricapapayae - caudata - cedrina - chlororaphis - cichorii - cissicola - citronellolis - coenobios - cohaerens - congelans - coronafaciens - corrugata - costantinii - cremoricolorata - cruciviae - dacunhae - dehalogenans - denitrificans - deva - diazotrophicus - effusa - elodea - elongata - ephemerocyanea - extremorientalis - ficuserectae - flavescens - flectens - floridana - fluorescens - fragi - frederiksbergensis - fulgida - fulva - fuscovaginae - gasotropha - gelidicola - geniculata - gessardii - gingeri - graminis - grimontii - halophila - hibiscicola - huttiensis - indica - iners - insueta - jessenii - jinjuensis - kilonensis - koreensis - lanceolata - libanensis - lindbergii - lini - lundensis - lutea - luteola - mandelii - marginalis - mediterranea - meliae - membranula - mendocina - mephitica - migulae - monteilii - moraviensis - mosselii - mucidolens - multiresinivorans - myxogenes - nitroreducens - oceanica - oleovorans - orientalis - oryzihabitans - otitidis - pachastrellae - palleroniana - panacis - parafulva - pavonacea - peli - perolens - pertucinogena - pictorum - plecoglossicida - pleomorpha - poae - pohangensis - proteofaciens - proteolytica - pseudoalcaligenes - psychrophila - psychrotolerans - putida - rathonis - reptilovora - resinovorans - rhizosphaerae - rhodesiae - rimaefaciens - saccharophila - salomonii - salopia - savastanoi - septica - simiae - sp. - stanieri - stereotropis - straminea - stutzeri - syncyanea - synxantha - syringae - taetrolens - thermotolerans - thivervalensis - tolaasii - tremae - trivialis - umsongensis - vancouverensis - veronii - viridiflava - vranovensis - xanthomarina

Pseudonocardia
alaniniphila - alni - ammonioxydans - antarctica - asaccharolytica - aurantiaca - autotrophica - benzenivorans - chloroethenivorans - compacta - dioxanivorans - endophytica - halophobica - hydrocarbonoxydans - kongjuensis - nitrificans - oroxyli - petroleophila - saturnea - sp. - spinosa - spinosispora - sulfidoxidans - sulfidoxydans - tetrahydrofuranoxydans - thermophila - xinjiangensis - yunnanensis - zijingensis

Pseudoramibacter
alactolyticus

Pseudorhodobacter
ferrugineus

Pseudospirillum
japonicum

Pseudoxanthomonas
broegbernensis - daejeonensis - japonensis - kalamensis - kaohsiungensis - mexicana - suwonensis

Psychrobacter
adeliensis - alimentarius - aquaticus - aquimaris - arenosus - cibarius - faecalis - fozii - frigidicola - glacincola - immobilis - luti - marincola - maritimus - namhaensis - nivimaris - phenylpyruvicus - proteolyticus - salsus - sp. - submarinus - urativorans - vallis

Psychroflexus
gondwanensis - torquis

Psychromonas
antarctica - arctica - marina - profunda

Psychroserpens
burtonensis

Pullulanibacillus
naganoensis

Pusillimonas
noertemannii

Pyrobaculum
aerophilum - arsenaticum - islandicum - oguniense - organotrophum

Pyrococcus
furiosus - horikoshii - woesei

Pyrodictium
abyssi - brockii - occultum

Pyrolobus
fumarii

Pyxicoccus
fallax