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[The structure of the surface apparatus in sarcocysts of Sarcosporidia in the persistence process].

The structure of the sarcocyst surface apparatus (SSA) was investigated for two sarcosporidian species: Sarcocystis muris (non-pathogenic) and S. fusiformis (pathogenic). The surface membrane, being the main SSA subsystem, makes numerous vesicle-like protrusions with different ultrastructural patterns. This made it possible to distinguish between four and three types of these protrusions in S. fusiformis and S. muris, respectively. Vesicles of similar structure, pinched off from the fully formed protrusions, were classified, correspondingly, in the same four and three different types. A presumable functional role of both protrusions and membrane-coated vesicles in pathogenicity of different sarcosporidian species is proposed. The vesicles pinched off from corresponding protrusions may be involved in transporting certain substance complexes from the sarcocyst to the harbouring host cell. In addition, another way of substance transporting was observed, when the cystic substances, not surrounded with any membrane coating, are thrown from open protrusions directly into the immediate cytoplasm of the host cell.