122 



OTHER FLAGELLATES 



horse with colic in Venezuela. Its troph- 

 ozoites measure 17 to 21 by 9 to 12 jx , and 

 its cysts measure 12 to 16 by 8 to 9. 5 fi . 



Giardia duodenalis (Davaine, 1875) 

 (syns. , HexuDiila duodenalis, LciDiblia 

 cuniciili) occurs in the anterior small in- 

 testine of Old and New World rabbits and 

 also in Coeiidu uillosus in Brazil. It oc- 

 curs sporadically and is apparently not 

 pathogenic. Its trophozoites measure 13 

 to 19 by 8 to 11 |i with a mean of 16 by 9^t . 

 The median bodies are curved bars re- 

 sembling the claws of a claw-hammer; th 

 they lie transversely across the body. 

 The cysts contain 2 to 4 nuclei. 



Giardia simoni Lavier, 1924 occurs 

 in the anterior small intestine of the Nor- 

 way rat, golden hamster and probably 

 various wild rodents. Its trophozoites 

 measure 11 to 19 by 5 to 11 jj,. Its median 

 bodies are curved bars of the duudenalis 

 type. 



G. 7nuris (Grassi, 1879) occurs in 

 the anterior small intestine of the house 

 mouse, Norway rat, black rat, golden 

 hamster and various wild rodents. It is 

 common in laboratory rats and mice. Its 

 trophozoites measure 7 to 13 by 5 to I0\i. 

 Its median bodies are small and rounded. 



G. curiae Hegner, 1923 occurs in the 

 anterior small intestine of the guinea pig. 

 Its trophozoites measure 8 to 15 by 6. 5 

 to lOfi. Its median bodies are curved 

 bars of the duodenalis type. 



Giardia chinchillae Filice, 1952 

 emend, (syn. , Giardia duodenalis race 

 chinchillae Morgan, 1949 of Filice, 1952; 

 altho he gave the first description of this 

 form, Morgan did not give it a specific 

 name; the name chinchillae vfas intro- 

 duced by Filice) occurs frequently in the 

 chinchilla. It is found thruout the small 

 intestine, but more commonly in the duo- 

 denum and anterior jejunum. Its troph- 

 ozoites measure 11 to 20 by 6 to 12 j:i . 

 Its median bodies are curved bars of the 

 duodenalis type. This species has been 

 accused by various workers of causing 

 diarrhea and even death (Shelton, 1954; 

 Gorham and Farrell, 1955). Treatment 

 with 6 to 9 mg quinacrine for 5 to 7 days 



was found by Hagan (1950) to eliminate the 

 infection. Attempts to transmit G. chin- 

 chillae to the golden hamster, white mouse, 

 domestic rabbit or guinea pig have been un- 

 successful (Morgan, 1949; Shelton, 1954). 



Genus TREPOfAONAS Dujardin, 1841 



These are free-swimming protozoa 

 with a more or less rounded, bilaterally 

 symmetrical body and with a cytostomal 

 groove on each side of the posterior half. 

 There are 8 flagella, of which 1 long and 

 3 short ones are present on each side. A 

 horseshoe-shaped structure near the an- 

 terior margin contains the 2 nuclei. Mem- 

 bers of this genus are free-living in fresh 

 water, coprophilic or parasitic in am- 

 phibia, fish and turtles. 



Trepomonas agilis Dujardin, 1841 

 occurs in stagnant water and the intestine 

 of amphibia and is also coprophilic. It is 

 7 to 25jj. long and 2 to 15|i wide, with a 

 flattened body and with the posterior end 

 wider than the rounded anterior end. The 

 flagella come off near the middle of the 

 body at the anterior end of the cytostome. 



ORDER PROTOMASTIGORIDA 



Members of this order have 1 or 2 

 flagella. 



FAMILY BODONIDAE 



Members of this family have 2 fla- 

 gella which originate anteriorly; one is 

 directed anteriorly and the other poster- 

 iorly. The anterior end is more or less 

 drawn out. There are 1 to several con- 

 tractile vacuoles. There are several gen- 

 era of free-living and parasitic forms in 

 this family. 



Genus BODO Stein, 1875 



These are small, more or less ovoid, 

 plastic forms with an anterior cytostome 

 and a central or anterior nucleus. Cysts 

 are forme'd. 



