Morphology
P. marinus may start out in an immature trophozoite stage (also referred to as a meront, merozoite, or aplanospore stage depending on the authors' taxonomic preferences), at 2-3 µm in diameter. A mature trophozoite stage (also known as mature-meront, mature-merozoite, or mature-aplanospore stage) then forms with an appearance of a "signet-ring" 3-10 µm in diameter each containing a large eccentric vacuole with the nucleus dislocated to the periphery of the cell. The tomont stage (a.k.a. sporangia or schizonts), may form "rosettes", 4-15 µm in diameter, and containing 2, 4, 8, 16 or 32 developing immature trophozoites. Under certain conditions there may also be an additional stage known as a biflagellate zoospore.
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