In the Protozoa different ways of cell multiplication have been developed during phylogeny.
Binary Fission
The most basic type of multiplication is binary fission, which always produces two daughter cells and needs a preceding duplication of the organelles of the mother cell (Figs. 1 and 2). Since the axis of cell division is fixed in the different groups within the Protozoa different types can be distinguished:
(a–f) Diagrammatic representation of different types of binary fission (invaginations are shown by small arrows). (a) Ameba type: division without fixed axis. (b) Trypanosomatid type (here Leishmania ): longitudinal division. (c) Trichomonad type (here T. vaginalis, note that it is only a longitudinal division at the beginning). (d) Endodyogeny of tissue-cyst-forming coccidia (e.g., Toxoplasma, Sarcocystis ): inner development of daughter cells. (e) Ciliata type (e.g., Balantidium): cross-division. (f) Opalina type: oblique division. AFanterior...
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(2016). Cell Multiplication. In: Mehlhorn, H. (eds) Encyclopedia of Parasitology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-43978-4_534
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