HAEMOSPORIDIA 



435 



Fig. 197. The life-cycle of Plas7nodium vivax (various authors), 

 a, sporozoite entering human blood plasma; b, sporozoite entering 

 erythrocyte; c, young schizont; d-f, schizogony; g, h, macrogameto- 

 cytes; i, j, microgametocytes, k, microgametes formed in the stomach 

 of mosquito; 1, union of gametes; m, zygote or ookinete, penetrating 

 through the gut wall; n, rounding up of an ookinete between the gut 

 wall and elastic membrane; o, oocyst in which sporozoites are being 

 developed; p, mature oocyst ruptured and the sporozoites are set free 

 in the body fluid; q, sporozoites entering the salivary gland. 



With pigment granules 



Schizogony in peripheral blood of vertebrates 



Family 1 Plasmodiidae 



Gametocytes in peripheral blood; schizogony elsewhere 



Family 2 Haemoproteidae (p. 439) 



Without pigment granules; minute parasites of erythrocytes 



Family 3 Babesiidae (p. 442) 



Family 1 Plasmodiidae Mesnil 



Genus Plasmodium Marchiafava et Celli. Schizogony in ery- 

 throcytes of vertebrates; anisogamy and sporozoite-formation in 

 Anopheles or Culex mosquitoes; widely distributed. Numerous 

 species. 



P. vivax (Grassi et Feletti) (Fig. 198, a-g). The organism of be- 

 nign tertian malaria of man; schizogony completed in 48 hours; 



