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[Plasmodium falciparum] [Plasmodium knowlesi] [Plasmodium malariae] [Plasmodium ovale] [Plasmodium vivax]

Ring-form trophozoites have one (rarely two) chromatin dots and a cytoplasm ring that tends to be thicker than P. falciparum.  'Bird's-eye' forms may appear.  There is no enlargement of infected RBCs.

A	B

A: Ring-form (lower right) and developing (upper left) trophozoites of P. malariae in a thick blood smear.
B: "Birds-eye" trophozoite of P. malariae in a thin blood smear.

C	D

C, D: Ring-form trophozoites of P. malariae in thin blood smears.