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Classification of Bacteria

 

 

Gram-negative bacteria

 

Cell Shape

Characteristics

Genus

 

Family

Cocci

Aerobic

Neisseria

Neisseriaceae

 

 

Veilonella

 

 

 

 

 

Coccobacilli

 

Brucella, Bordetella

Pasteurella

Haemophilus

Brucellaceae

 

 

 

 

Bacilli

Facultative anaerobic, motile with peritrichous

flagella or immotile

Escherichia, Shigella, Salmonella, Proteus, Erwinia, Yersinia,

Enterobacter,

Serratia

Entero-bacteriaceae

 

 

 

 

 

Aerobic, motile with peritrichous flagella or immobile

Azotobacter

 

Rhizobium

Azotobacteraceae

 

Rhizobiaceae

 

 

Aerobic, motile with polar flagella

Nitrosomonas, Nitrobacter, Thiobacillus

Nitrobacteraceae

 

 

Pseudomonas, acetobacter, legionella

Pseudomona-daceae

 

 

 

 

 

Facultative anaerobic with polar flagella

Campylobacter, Zymomonas, Aeromonas

 

 

 

 

 

 

Curved rods with polar flagella

Vibrio, Spirillum, Desulfovibrio

Spirillaceae

 

 

 

 

 

 

 

 

 

 

 


 

Gram-Positive Bacteria

 

 

Cell Shape

Characteristics

Genus

 

Family

Cocci

cells in irregular clusters

staphylococcus

Micrococcus

Sarcina

 

Micrococcaceae

 

Cells in chains

Streptococcus

Leuconostoc

Streptococcaceae

 

 

Bacilli

Aerobic Sporing

Bacillus

Bacillaeceae

 

Anaerobic Sporing

Clostridium

 

 

 

Lactic fermentation

Lactobacillus

Lactobacillacaeae

 

Propionic fermentation

Propionibacterium

Propioni-bacteriaceae

 

Oxidative, weakly fermentative

Corynebacterium

Listeria

Erysipelothrix

 

 

 

 

 

 

 

Other Major Groups

 

Cell Shape

Characteristics

Genus

 

Family

Acid-fast rods

Ray-forming rods

 

Mycobacterium

Actinomyces, Nocardia

Streptomyces

 

Actinomycetales

Spiral organisms

motile

Treponema, Borrellia, Leptospira, Spirocheta

 

Spirochetales

Small pleomorphic;

lack rigid wall

Mycoplasma

 

Mollicutes

Small intracellular parasites

 

 

Rickettsiae, Coxiella,

Chlamydia

Rickettsiaceae

Chlamydiaceae

Intracellular parasites

bordeline with protozoa

 

Bartonella

Bartonellae

 

 

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