Paenibacillus
alginolyticus - alvei - amylolyticus - apiarius - azotofixans - borealis - chibensis - chitinolyticus - chondroitinus - curdlanolyticus - dendritiformis - ehimensis - illinoisensis - kobensis - larvae - lautus - lentimorbus - macerans - macquariensis - pabuli - peoriae - polymyxa - popilliae - thiaminolyticus - validus

Pandoraea
apista - norimbergensis - pnomenusa - pulmonicola

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

Paracoccus
alcaliphilus - alkenifer - aminophilus - aminovorans - denitrificans - kocurii - pantotrophus - solventivorans - thiocyanatus

Paracraurococcus
ruber

Paralactobacillus
selangorensis

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

Paucimonas
lemoignei

Pectobacterium
atrosepticum - betavasculorum - cacticida - carotovorum - wasabiae

Pediococcus
acidilactici - damnosus - dextrinicus - inopinatus - parvulus - pentosaceus - sp. - urinaeequi

Pedobacter
africanus - heparinus - piscium - saltans

Pelistega
europaea

Peptococcus
niger

Peptoniphilus
asaccharolyticus - harei - ivorii - lacrimalis

Peptostreptococcus
anaerobius

Phenylobacterium
immobile

Phocoenobacter
uteri

Photobacterium
angustum - damselae - iliopiscarium - leiognathi - phosphoreum - profundum

Photorhabdus
asymbiotica - luminescens - temperata

Planococcus
citreus

Planomicrobium
mcmeekinii - okeanokoites

Plesiomonas
shigelloides

Polaribacter
filamentus - franzmannii - glomeratus

Porphyrobacter
neustonensis

Porphyromonas
canoris - gingivalis

Pragia
fontium

Prauserella
rugosa

Prevotella
bivia - buccae - corporis - denticola - disiens - enoeca - intermedia - melaninogenica - oulora - sp. - zoogleoformans

Prolinoborus
fasciculus

Propionibacterium
acidipropionici - acnes - avidum - cyclohexanicum - freudenreichii - granulosum - jensenii - propionicus - sp. - thoenii

Propionimicrobium
lymphophilum

Proteus
genomospecies - hauseri - mirabilis - myxofaciens - penneri - vulgaris

Providencia
alcalifaciens - heimbachae - rettgeri - rustigianii - stuartii

Pseudaminobacter
salicylatoxidans

Pseudoalteromonas
antarctica - atlantica - carrageenovora - citrea - distincta - elyakovii - espejiana - haloplanktis - luteoviolacea - nigrifaciens - piscicida - prydzensis - rubra - tetraodonis - undina

Pseudomonas
abietaniphila - aeruginosa - agarici - alcaligenes - alginovora - amygdali - anguilliseptica - asplenii - aurantiaca - avellanae - azotoformans - balearica - beijerinckii - boreopolis - brassicacearum - brenneri - cannabina - caricapapayae - cedrina - chlororaphis - cichorii - cissicola - citronellolis - corrugata - flavescens - fluorescens - fragi - frederiksbergensis - fulva - fuscovaginae - gelidicola - gessardii - graminis - iners - jessenii - libanensis - lundensis - luteola - mandelii - marginalis - mendocina - mephitica - migulae - monteilii - mosselii - mucidolens - multiresinivorans - nitroreducens - oleovorans - orientalis - oryzihabitans - pertucinogena - pictorum - plecoglossicida - pseudoalcaligenes - putida - reptilovora - resinovorans - rhodesiae - saccharophila - savastanoi - sp. - straminea - stutzeri - syncyanea - synxantha - syringae - taetrolens - tolaasii - vancouverensis - veronii - viridiflava

Pseudonocardia
asaccharolytica - petroleophila - sulfidoxydans

Pseudorhodobacter
ferrugineus

Pseudospirillum
japonicum

Pseudoxanthomonas
mexicana

Psychrobacter
frigidicola - glacincola - immobilis - phenylpyruvicus - proteolyticus - urativorans

Psychroflexus
gondwanensis - torquis