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This paper attempts to trace the probable evolution of mammalian trypanosomes. Haemato-phagous insects probably originated from phytophagous and/or predaceous ancestors, the trypano-somatid parasites of which eventually gave rise to trypanosomes. Trypanosomes transmitted by inoculation...

Hoare, C. A.
Adv. Parasit., 1967, 5, pp 47-91