SCHEMATIC OUTLINE OF THE PROBABLE RELATIONSHIP OF THE VARIOUS GROUPS OF BACTERIA
hemorrhagic
septicemia group
aciduric
lactic
bacilli
milk
streptococci
pneumococcus
capsulated
streptococci
B. aerogenes
autotrophic denitrifiers
(NH, users, reducers)
oxybacteria
carboxymonas
methanomonas
streptococci
B. dysenteriae
B. proteus
B. cloacae
B. radicicola
(plant parasites)
azotobacter
B. typhi
B. coli
staphylococci
(pathogens)
micrococci
(saprophytes)
albococci
actinomyces B. tuberculosis
diphtheroids
acid fasts
pseudomonas,
vibrios
nitrifiers
nitrogen
fixers (oxidative)
sporothrix form
pigment
bacteria
anaerobic
sporebearers
aerobic
sporebearers
Fig. 2.6
Kligler’s 1917 suggestion of the relations among some of the bacteria known at the time. The bacteria started with organisms living on gases thought to
be available on the early Earth and continue with increasing use of organic carbon and nitrogen sources. Later radiations are based on increasing morphological
complexity. (Reproduced from Kligler 1917)
2 Darwin’s Science’s Impact on the Evolution of the Microbiological Sciences
33