Cyst with 4 nuclei & Flagellar apparatus.
03a. Giardia Cyst -- Less than 12 µm. Non-motile ellipsoidal cyst stage, with organelles visible (nuclei (4), flagellar apparatus (= "axostyle")).
Cyst with 4 elongate sporozoites & excretory granules.
03a. Sarcocystis Sporocyst -- Less than 15 µm. Four elongate sporozoites and opaque excretory granules visible.

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