618 



PROTOZOOLOGY 



rariperezi of Mexico; experimentally S. olivaceous, S. undulatus, 

 Crotaphytus collaris, PhrynQsoma cornutum and P. asio, become in- 

 fected ; in erythrocytes and normoblasts, and in all types of circulat- 

 ing cells; host cells not hypertrophied ; schizonts round to elongate; 

 10-40 merozoites; gametocytes 12-16/z by 6-7. 7 ju, only in haemo- 

 globin-containing cells which become enlarged and distorted (Thomp- 

 son and Huff, 1944); a mite, Hirstella sp., was considered to be a 

 possible vector (Pelaez, Reyes and Barrera, 1948). 



Fig. 265. Plasmodium mexicanum, X1780 (Pelaez et al. ). a, b, young 

 and growing trophozoites in host's erythrocyte; c, segmenting schizont; 

 d, macrogametocyte; e, microgametocyte. 



P. rhadinurum T. and H. In the erythrocytes of Iguana iguana 

 rhinolopha in Mexico; schizonts extremely polymorphic with one or 

 two long processes; 4-5 merozoites; gametocytes 6. 5-7. In ; vector un- 

 known (Thompson and Huff, 1944a). 



P.floridense T. and H. In the erythrocytes of Sceloporus undulatus 

 in Florida; young trophozoites pyriform; 6-21(12) merozoites; 

 gametocytes 7.5-8.0/u in diameter; vector unknown (Thompson and 

 Huff, 1944a) 



P. lygosomae Laird. In New Zealand skink, Lygosoma moco (Laird, 

 1951). 



Family 2 Haemoproteidae Doflein 



Schizogony occurs in the endothelial cells of vertebrates; mero- 

 zoites enter circulating blood cells and develop into gametocytes; 

 if blood is taken up by specific blood-sucking insects, gametocytes 

 develop into gametes which unite to form zygotes that undergo 

 changes similar to those stated above for the family Plasmodiidae. 



Genus Haemoproteus Kruse. Gametocytes in erythrocytes, with 

 pigment granules, halter-shaped when fully formed (hence Halter- 

 idium Labbe) ; schizogony in endothelial cells of viscera of vertebrate 

 reptiles. Species (Cerny, 1933; Coatney and Roudabush, 1937); 

 transmission experiments (Noller, 1 Q 20). 



