296 Sporozoa 



are usually produced. In the Eimeriida, gametocytes develop independ- 

 ently and the microgametocyte typically produces many microgametes. 

 Order 1. Adeleida. On the basis of differences in the zygote and oocyst, 

 the Adeleida may be divided into the suborders Adeleina and Haemo- 

 gregarinina. The Adeleina form an inactive zygote which develops a 

 typical oocyst. The ookinete of the Haemogregarinina secretes a flexible 

 membrane which is stretched during development. 



Suborder 1. Adeleina 



Four families have been recognized. Sporocysts are developed in t'wo 

 families but not in the others. 



Family 1. Adeleidae. Sporocysts are developed within an oocyst and the 

 life-cycle is typical of the suborder. 



The following genera have been assigned to the family: Adelea Schneider (Figs. 6. 

 13, H, J; 15, G), with a large oocyst and a variable but fairly large number of discoidal 

 sporocysts. each containing two sporozoites; Adelina Hesse (43, 113; Fig. 6. 15, A-F), 

 oocyst containing relatively few spherical sporocysts, each with two sporozoites; Chaga- 

 sella Machado (Fig. 6. 15, H, I), oocyst containing three sporocysts, each with four 

 sporozoites; Klossia Schneider (91, 93), oocyst containing many spherical sporocysts, 

 each with four sporozoites. 



Family 2. Dobelliidae. The only genus is Dobellia Ikeda (59), which is 

 unusual in that the microgametocyte produces a fairly large number of 

 microgametes in spite of the fact that syzygy occurs. Sporocysts are not 

 produced. A single species has been reported from sipunculids. 



Family 3. Klossiellidae. The oocyst contains a number of sporocysts, 

 each with many sporozoites. Microgametogenesis yields two microgametes. 

 The family contains the genus, Klossiello Smith and Johnson (128), rep- 

 resented in mice and guinea pigs. 



Family 4. LegerelUdae. The single genus, Legerella Mesnil (Fig. 6. 14, 

 F), produces an oocyst with many sporozoites but no sporocysts. The 

 known species occur in fleas and myriapods. 



Suborder 2. Haem,ogregarinina 



Members of this group differ from other Adeleida in that the life-cycle 

 involves two hosts and the zygote is an ookinete. Three families, each with 

 a single genus, are generally recognized. 



Faynily 1. HaemogregarinJdae. In Haemogregarina Danilewsky (Fig. 6. 

 16, A-E), the small oocyst contains no sporocysts. The sexual phase of the 

 cycle occurs in leeches; asexual stages, in various turtles. Merozoites in- 

 vade erythrocytes of the vertebrate and develop into gametocytes. 



Family 2. Hepatozoidae. The large oocysts contain many sporocysts, 

 each with a dozen or more sporozoites. The gametocytes appear in leuco- 

 cytes of the vertebrate host. Sexual stages occur in tsetse flies (50), lice, 



