Caldimonas
taiwanensis

Campylobacter
coli - concisus - curvus - fetus - gracilis - helveticus - hominis - hyointestinalis - insulaenigrae - jejuni - lari - mucosalis - rectus - showae - sp. - sputorum - upsaliensis

Capnocytophaga
canimorsus - cynodegmi - gingivalis - granulosa - haemolytica - ochracea - sp. - sputigena

Cardiobacterium
hominis

Carnobacterium
alterfunditum - divergens - funditum - gallinarum - maltaromaticum - mobile

Caryophanon
latum

Caulobacter
henricii - segnis

CDC
group

Cedecea
davisae - lapagei - neteri

Cellulomonas
biazotea - cellasea - fermentans - fimi - flavigena - gelida - hominis - uda - xylanilytica

Cellulophaga
baltica - fucicola - lytica - pacifica

Cellulosimicrobium
cellulans

Cellvibrio
fibrivorans - fulvus - gandavensis - mixtus - ostraviensis - sp. - vulgaris

Chimaereicella
alkaliphila

Chitinimonas
taiwanensis

Chitinophaga
pinensis

Chromobacterium
violaceum

Chromohalobacter
canadensis - israelensis - marismortui

Chryseobacterium
balustinum - defluvii - gleum - indologenes - indoltheticum - joostei - scophthalmum - sp. - vrystaatense

Citrobacter
amalonaticus - diversus - freundii

Clavibacter
michiganensis

Clostridium
acetobutylicum - beijerinckii - bifermentans - butyricum - difficile - lactatifermentans - novyi - oceanicum - pasteurianum - perfringens - sordellii - sp. - sphenoides - sporogenes - thermocellum - tyrobutyricum

Cobetia
marina

Coenonia
anatina

Collimonas
fungivorans

Comamonas
aquatica - denitrificans - kerstersii - nitrativorans - sp. - terrigena - testosteroni

Corynebacterium
afermentans - amycolatum - auris - beticola - casei - cystitidis - flavescens - glutamicum - jeikeium - mastitidis - matruchotii - propinquum - pseudodiphtheriticum - simulans - sp. - terpenotabidum - urealyticum - variabile - xerosis

Cupriavidus
basilensis - campinensis - gilardii - metallidurans - necator - oxalaticus - pauculus - respiraculi - taiwanensis

Curtobacterium
citreum - flaccumfaciens - herbarum - luteum - plantarum - pusillum

Curvibacter
delicatus - lanceolatus

Cyclobacterium
amurskyense - marinum

Cytophaga
hutchinsonii - sp.