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Bruce's Classification of Pathogenic African Trypanosomes
  Form Cytoplasm Micro-
nucleus
Undulating
Membrane
Movement Development in
Tse-Tse
Susceptible
animals
A.
Trypanosoma Brucei Group,
including
T. Brucei—T. Gambiensi
T. Evansi
T. Equiperdum
Polymorphic
including
short and
stumpy
forms
Contains dark-
staining
granules
Small and
as a rule, at
some distance
from posterior
end
Well
developed
and in
bold folds
Active Completed in
salivary glands
Many species of
mammals
B.
Trypanosoma Pecorum Group,
including T. Pecorum
T. Simiæ
Mono-
morphic
and small
Non-
granular
Prominent
and sub-
terminal
Well
developed
Active Completed in pro-
boscis and hypo-
pharynx.
Never found in
salivary glands
Cattle—very fatal
to pigs
C.
Trypanosoma Vivaz Group,
including T. Vivax
T. Capræ
T. Uniformi
Mono-
morphic
Non-
granular
Large and
terminal
Little
development
and simple
Very rapid Completed in pro-
boscis and hypo-
pharynx.
Never found in
salivary glands
Affects only horse,
cattle, goats and
sheep.
Ordinary laboratory
animals immune