Aerobic/microaerophilic, motile, helical/vibrioid gram-negative bacteria
Nonmotile (or rarely motile), gram-negative curved bacteria
Gram-negative aerobic/microaerophilic rods and cocci
Facultatively anaerobic gram-negative rods
Gram-negative, anaerobic, straight, curved, and helical bacteria
Dissimilatory sulfate- or sulfur-reducing bacteria
Anaerobic gram-negative cocci
Rickettsias and chlamydias
Anoxygenic phototrophic bacteria
Oxygenic phototrophic bacteria
Aerobic chemolithotrophic bacteria and associated organisms
Budding and/or appendaged bacteria
Nonphotosynthetic, nonfruiting gliding bacteria
Fruiting, gliding bacteria: the myxobacteria
Endospore-forming gram-positive rods and cocci
Regular, nonsporing gram-positive rods
Irregular, nonsporing gram-positive rods
Nocardioform actinomycetes
Genera with multilocular sporangia
Streptomycetes and related genera
Thermomonospora and related genera.
(cont) Thermoactinomycetes
Mycoplasmas (or mollicutes): cell wall-less bacteria
Archaeal sulfate reducers
Extremely halophilic, aerobic archaeobacteria (halobacteria)
Cell wall-less archaeobacteria
Extremely thermophilic and hyperthermophilic S0-metabolizers.
