THE TELOSPORASIDA AND THE COCCIDIA PROPER 



243 



Life Cycle : Unknown. 



Pathogenesis : Unknown. 



Remarks : The validity of this spe- 

 cies is dubious. It is more likely a para- 

 site of some wild bird, such as /. lacazei 

 of the English sparrow. 



ISOSPORA HEISSINI 

 SVANBAEV, 1955 



Host : Domestic turkey. 



Location : Unknown. Oocysts found 

 in feces. 



Geographic Distribution : USSR (Ka- 

 zakhstan). 



Morphology : The oocysts are spher- 

 ical or rarely broadly ovoid, 25 to 33/1 in 

 diameter, with a mean of 31 by 30 fx. The 

 oocyst wall is greenish, smooth, double 

 contoured (illustrated with a single layer), 

 and 1.5 to 1.7|i thick. A micropyle is 

 apparently absent. An oocyst polar gran- 

 ule is present. An oocyst residuum is 

 absent. The sporocysts are spherical or 

 ovoid and pointed at one end, 15 by 10 jn. 

 A sporocyst residuum is absent. The 

 sporozoites are oval, 7 to 9 by 4 to 5 /i . 

 The sporulation time is 16 to 20 hours at 

 20 to 25° C. 



Life Cycle : Unknown. 



Pathogenesis : Unknown. 



Remarks : Svanbaev (1955) found this 

 species only in turkeys up to 4 months of 

 age. 



Genus WENYONELLA Hoare, 1933 



In this genus the oocyst contains 4 

 sporocysts, each of which contains 4 

 sporozoites. 



WENYONELLA GALLINAE 

 RAY, 1945 



Host: Chicken. 



Location : Terminal part of intestine. 



Geographic Distribution : India. 



Prevalence : Uncommon. Gill (1954) 

 found this species in 1.7% of 120 chickens 

 near Mukteswar. 



Morphology : The oocysts are ovoid, 

 rough, punctate, 29 to 34 by 20 to 23 ^i. 

 The sporocysts are flask-shaped, 19 by 

 8jj,. No other morphological information 

 was given. The sporulation time is 28° C 

 is 4 to 6 days. 



Life Cycle : Unknown. 



Pathogenesis : According to Ray 

 (1945), this species causes a diarrhea 

 with blackish-green, semisolid excreta. 

 The terminal part of the intestine is thick- 

 ened and congested, and there are pinpoint 

 hemorrhages in the mucosa. 



Genus TYZZERIA Allen, 1936 



In this genus the oocyst contains 8 

 naked sporozoites and no sporocysts. 



TYZZERIA PERNICIOSA 

 ALLEN, 1936 



Host: Domestic Pekin duck. 



Location : Thruout the small intes- 

 tine, but especially in the upper half. 



Geographic Distribution : North 

 America. 



Prevalence : Uncommon. This spe- 

 cies has been reported from domestic 

 ducks only by Allen (1936) on Long Island. 

 However, its relationship to T. alleni, 

 which Chakravarty and Basu (1946) des- 

 cribed from the cotton teal {Cheniscus 

 coromandelianus) in India, to Tyzzeria sp. 

 which Farr (1952) reported from the black 

 duck {Anas rubripes), to T. anseris re- 

 ported by Farr (1959) from the lesser 

 scaup duck {Nyroca affinis) in Michigan, 

 and to T. anseris from domestic and wild 

 geese and the whistling swan (see Hanson, 

 Levine and Ivens, 1957) remains to be de- 

 termined. 



