146 



THE AMOEBAE 



of the goat in Holland. Hoare (1940) found 

 it in the feces of 10 out of 14 goats in 

 England and redescribed it under the name 

 E. deblieclii. Noble and Noble (1952) 

 found it in the feces of 27 out of 28 goats 

 in the United States and called it E. fiolecki 

 (the name they used for the pig entamoeba). 

 However, they considered the uninucleate 

 entamoebae of cattle, goats, pigs and 

 sheep to be morphologically indistinguish- 

 able. Since goats share a great many 

 parasites with sheep but relatively few 

 with swine, and in the absence of cross- 

 infection experiments to the contrary, the 

 best name for the goat entamoeba is E. 

 ovis . 



The trophozoites of E. ovis measure 

 11 to 12 by 13 to 14 ji. The nucleus typ- 

 ically contains a large, pale endosome 

 generally composed of several granules, 

 a ring of peripheral chromatin, and num- 

 erous small granules between the endo- 

 some and the nuclear membrane. In 

 some cases there is very little peripheral 

 chromatin and in others the endosome 

 may be very small. The cysts are 4 to 

 13|Lx in diameter with a mean of 7|j. and 

 contain a single nucleus when mature. 

 They usually contain numerous chromatoid 

 bodies of varying size, shape and abun- 

 dance and a glycogen vacuole. 



The cysts of the form from the goat 

 are 4 to 13fi in diameter. Hoare (1940) 

 found 2 races which differed in size. The 

 cysts of one ranged from 5 to 9|j in diam- 

 eter with a mode of 6. 7 p. , while the cysts 

 of the other ranged from 9 to 13^ with a 

 mode of 10.4fi Noble and Noble (1952), 

 however, found only a single race with 

 cysts ranging in diameter from 4 to 12/:i 

 with a mean of 6. 4 /i . 



It is quite likely that E. ovis is a 

 synonym of E. hovis, but until cross in- 

 fection experiments have been carried 

 out, it is thought best to retain it as a 

 separate species. 



ENTAMOEBA DILIMANI 

 NOBLE, 1954 



Noble (1954) found this species in the 

 feces of all of 12 goats he examined on 



Luzon in the Philippines. He saw only 2 

 trophozoites. They were 12/1 across, had 

 broad, rounded pseudopods whose ends 

 had fairly clear ectoplasm, and food vac- 

 uoles containing bacteria. The cysts are 

 5 to 16/i in diameter with a mean of 9. 7/i , 

 and contain a single nucleus. The endo- 

 some is usually a small, central dot but 

 may be eccentric. Peripheral chromatin 

 is often absent or may appear as a few 

 large, irregular granules. The entire 

 nucleus is filled with fine granules which 

 may form a ring around the endosome. 

 The cyst contains 1 or more large glycogen 

 vacuoles and from one to a large number of 

 chromatoid bodies varying in shape from 

 small, irregular masses to a single, large, 

 sausage-shaped body. Noble considered 

 this species to differ from the Entamoeba 

 in American goats in that the peripheral 

 chromatin rarely forms a heavy ring, the 

 endosome is usually a single, small dot, 

 and a periendosomal ring of chromatin is 

 usually present. 



ENTAMOEBA SUIS 

 HARTMANN, 1913 



Synonym : Entamoeba debliecki, pro 

 parte. 



A number of authors have used the 

 name. Entamoeba polecki Prowazek, 

 1912, for this species, but this name must 

 be considered a nomen nudum because 

 Prowazek' s description was so poor as to 

 be unrecognizable (see Hoare, 1940, 1959). 



E. siiis occurs in the cecum and colon 

 of swine. Chang (1938) found it in 71% of 

 209 pigs in China. Pavloff (1935) found it 

 in 26 of 1840 pigs in France and Bulgaria. 

 Simitch et al. (1959) found it in 8% of 1800 

 pigs in Yugoslavia. Frye and Meleney 

 (1932) found it in 63% of 80 pigs, Alicata 

 (1932) found it in 43% of 35 pigs, and Noble 

 and Noble (1952) found it in all of 30 pigs 

 in the United States. Mackinnon and Dibb 

 (1938) found it in the European wild boar 

 {Stis scrofa), giant forest hog (Hylochoerus 

 meinertzliageni) and Indian boar (Sus 

 cristatiis) in a London zoo. Kessel and 

 Johnstone (1949) and Kessel and Kaplan 

 (1949) reported "E. polecki" from the 

 rhesus monkey but remarked that it 



