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Amoeboid forms (haemozoin) A solid and angular late trophozoite form of P.malariae. Note the golden pigment in separate clumps of granules distributed over the parasite surface (arrowed). The late trophozoite of P.vivax becomes more solid, but with an irregular form that is said to resemble an amoeba with extended processes. Other features of the species will also be detected. Species significance A fairly specific feature of P.vivax that is helpful to indicate this diagnosis. The form develops as the parasites mature and early signs may be seen in early trophozoites. Additional images A A B B Amoeboid forms - an early trophozoite begins to become more irregular though still a partly recognisable "ring" (A), a late trophozoite developing a more typical solid irregular form (B) Additional images Pigment in different stages of parasite development Gametocyte P.malariae Schizont P.ovale Trophozoite P.ovale Gametocyte P.falciparum