OTHER FLAGELLATES 



109 



Monocercomouas cuniculi (Tanabe, 

 1926) occurs in the cecum of the domestic 

 rabbit. It is piriform, 5 to 14 ji long. 

 Its axostyle is slender, hyaline, and pro- 

 jects from the body. 



Monocerco))io)ias gaUinaritm (Martin 

 and Robertson, 1911) Morgan and Hawkins, 

 1948 is said to occur in the ceca of the 

 chicken. Kotlan (1923) reported it from a 

 single domestic duck. Its body is piri- 

 form, 5 to 8 by 3 to 4 fj, . There is some 

 question whether this is a valid species. 

 It has been reported by Martin and Robert- 

 son (1911) in England, Kotlan (1923) in 

 Hungary, and Morgan and Hawkins (1952) 

 in Wisconsin, but McDowell (1953) failed 

 to find it in 1000 slides from a large num- 

 ber of chickens in Pennsylvania. McDowell 

 believed, along with Minchin (1917), 

 Wenyon (1926), Doflein and Reichenow 

 (1929) and others, that it is simply a de- 

 generate Trichomonas eberthi. 



Genus HEXAMASHX 

 Alexeieff, 1912 



In this genus the body is piriform, 

 with a rounded anterior end. The cyto- 

 stome and nucleus are anterior. There 

 are 6 flagella, of which 1 trails. (Ac- 

 cording to Nie, 1950, the number of an- 

 terior flagella varies in this genus from 

 2 to 6. ) A pelta is present, the axostyle 

 is conspicuous, and the parabasal body 

 prominent. Members of this genus have 

 been found in mammals, amphibia and 

 insects. Hexamastix caviae Nie, 1950 

 and H. robustus Nie, 1950 occur in the 

 guinea pig cecum, and H. muris (Wen- 

 rich, 1924) in the cecum of the Norway 

 rat, golden hamster and other rodents. 



Genus CHILOMITUS 

 Da Fonseca, 1915 



The body is elongate, with a convex 

 aboral surface. The pellicle is well de- 

 veloped. The cuplike cytostome is near 

 the anterior end. Four flagella emerge 

 thru it from a bilobed blepharoplast. The 

 nucleus and parabasal body are just below 

 the cytostome. An axostyle is present but 



may be rudimentary. Cysts may occur. 

 Only a few species have been described, 

 all in mammals. Cliilo»nlus caviae da 

 Fonseca, 1915 and C. coiiexits Me, 1950 

 occur in the guinea pig cecum. 



Genus PROTRICHOMONAS 

 Alexeieff, 1912 



The body is piriform or beet- shaped, 

 with 3 anterior flagella of equal length 

 arising from an anterior blepharoplast, 

 an anterior nucleus and an axostyle. Three 

 species have been named, from birds, 

 mammals and a fish. 



Protrichomonas niniinantiiiDi (Braune, 

 1914) nov. comb, was originally assigned 

 by Braune (1914) to the genus TrichoDias- 

 tix (now Monocerconionas), but the absence 

 of a trailing flagellum makes this assign- 

 ment incorrect. Its description agrees 

 with that of Protricho))wiias, altho it must 

 be said that this genus is badly in need of 

 redescription. P. ru)ninaiitium occurs in 

 the rumen of cattle and sheep. It is about 

 8/i long. Its nucleus is often surrounded 

 by a clear zone. No cytostome was seen. 



Protrichomonas anatis Kotlan, 1923 

 has been described from the large intes- 

 tine of the domestic duck and other water 

 birds. It is 10 to 13|Li long and 4 to 6ju 

 wide. Two distinct fibrillae arise from 

 the anterior blepharoplast and pass back 

 thru the body, separating to pass around 

 the nucleus and finally passing out of the 

 body as a pointed axostyle. The nucleus 

 is often triangular. 



ORDER POLYMASTIGORIDA 



Members of this group have 2 to about 

 12 flagella and 1, 2 or several nuclei. 

 They lack a costa, axostyle (except in some 

 Hexamitidae and Polymastigidae) and para- 

 basal body. 



FAMILY TETRAMITIDAE 



In this family there is a single nucleus 

 and 4 flagella, 1 or 2 of which may be 



