SPOROZOA CLASSIFICATION 



We may now pass to the classification of the group. 



Telosporidea. Cells 1-nucleate until the onset of brood -formation, 

 which is simultaneous. 



1. Gregarinidaceae. Cells early provided with a firm pellicle and 

 possessing a complex ectosarc ; at first intracellular, soon becoming 

 free in the gut or coelom of Invertebrates. Pairing between adults, 

 which simultaneously produce each its brood of gametes, isogamous 

 or bisexual, which pair within the common cyst ; zygotospores 

 surrounded by a firm cyst, and producing within a brood of 

 sickle-shaped zoospores. 



(i.) Schizogregarinidae. Multiplying by simple fission in the free 

 state as well as by brood -formation ; the brood-cells conjugating 

 in a common cyst, but producing only one pairing nucleus in 

 each mate (the rest aborting), and consequently only one 

 spore. .... Ophryocystis A. Schn. 



(ii.) Acephalinidae. Cell one -chambered, usually without an epimerite 



for attachment. Monocystis F. Stein ; Lankesteria Mingazzini. 

 (iii.) Dicystidae. Cell divided by a plasmic partition ; epimerite 

 usually present. Gregarina Dufour ; Stylorhynchus A. Schn. ; 

 Pterocephalus A. Schn. 



2. Coccidiaceae. Cells of simple structure, intracellular in Metazoa. 

 Pairing between isolated cells usually sexually differentiated as oosphere 

 and sperm, the latter often flagellate. Brood-formation of the adult cell 

 giving rise to sickle-shaped zoospores (merozoites), or progamic and pro- 

 ducing the gametes. Oosperm motile or motionless, finally producing 

 a brood of spores, which again give rise to a brood of sickle-spores, 

 (i.) Coccidiidae. Cell permanently intracellular, or very rarely 



coelomic, encysting or not before division ; zoospores always 

 sickle-shaped ; oosperm encysting at once, producing spores with 

 a dense cell-wall producing sickle-germs, 

 (ii.) Haemosporidae.' Cells parasitic in the blood corpuscles or free 

 in the blood of cold-blooded animals, encysting before brood- 

 formation ; zoospores sickle -shaped ; oosperm at first motile. 

 Lanher ester ella Labbe ; (Brepanidium Lank. ;) Karyolysus Labbe ; 

 Haemogregarina Dan ile vvsk i. 

 (iii.) Acystosporidae. Cells parasitic in the blood and haemato- 

 cytes of warm-blooded Vertebrates ; never forming a cyst- wall 

 before dividing ; zoospores formed in the corpuscles, amoeboid. 

 Gametocytes only forming gametes when taken into the stomach 

 of insects. Oosperm at first active, passing into the coelom, 

 producing naked spores which again produce a large brood 

 of sickle zoospores, which migrate to the salivary gland, and are 

 injected with the saliva into the warm-blooded host. Haemamoeba 

 Grassi and Feletti ; Laverania Grassi and Feletti ; Haemoproteus 

 Kruse ; Halteridium Labbe. 1 

 Neosporidia. Cells becoming multinucleate apocytes before any brood- 

 formation occurs. Brood -formation progressive through the apocyte, not 

 simultaneous. 



1 See p. 120. 

 VOL. I H 



