Division and morphogenesis of Cryptobia catostomi (Protozoa: Kinetoplastida) in the blood of white sucker (Catostomus commersoni)

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Abstract
Cryptobia catostomi multiplied in the blood of the white sucker (Catostomus commersoni) by longitudinal binary fission. The 1st indication of division was the production of 2 flagella followed by incomplete nuclear division. By this time the blepharoplast had divided. Each daughter blepharoplast, which gave rise to an old and a new flagellum, migrated to either end of the body. The kinetoplast then divided. The chromatin strand connecting the 2 nuclei disappeared and the organism completed division giving rise to 2 specimens. By following the course of infection in a mature white sucker it was observed that type III specimens were most abundant when the parasite population was increasing. As the population leveled off to a plateau, the numbers of type III decreased and were replaced by type II and eventually type I specimens.