Leucocytozoon
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Leucocytozoon is a genus of parasitic alveolates belonging to the phylum Apicomplexa.
Leucocytozoon
Drawing of owl blood cells parasitized by Leukocytozoen danilewskyi by Hans Ziemann in 1898
Blood from a chicken infected with a male gametocyte (left) and a female gametocyte (right).
Apicomplexa
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The Apicomplexa are organisms of a large phylum of mainly parasitic alveolates. Most possess a unique form of organelle structure that comprises a type of (non-photosynthetic) plastid called an apicoplast—with an apical complex membrane. The organelle's apical shape is an adaptation that the apicomplexan applies in penetrating a host cell.
Trophozoite of a gregarine
Dividing Toxoplasma gondii (Coccidia) parasites
Trophozoites of the Plasmodium vivax (Haemosporidia) parasite among human red blood cells
Two tachyzoites of Toxoplasma gondii, transmission electron microscopy