MORPHOLOGY AND TAXONOMY OF THE MASTIGOPHORA 423 



Key to Families. 



3. With one flagellum 4 



With two flagella 8 



4. Non-parasitic forms 5 



Parasitic flagellates 4 Family Trypanosomidae 



5. With protoplasmic collar about flagellum 



6 Family Craspedomonadidae 



Without protoplasmic collar (> 



(3. Body wall distinct 3 Family Peranemidae 



Body wall indistinct 7 



7. With proboscis-like process. . . .5 Family Bicoecidae 

 Without proboscis 2 Family Oicomonadidae 



8. Flagella of similar length 7 Family Amphimonadidae 



Flagella of dissimilar length. . . .8 Family Monadidae 



9. With one posteriori y directed flagellum. . 10 

 With two posteriorly directed flagella 



11 Family Trimastigidae 

 10. Trailing flagellum leaves body at the 



anterior end 9 Family Bodonidae 



Trailing flagellum attached to full length 



of body 10 Family Cforcomonadiuae 



PROTOMONADS— Genera. 



Family 1. Rhizomastigidae Butschli. 



1. Flagella and pseudopodia distributed 

 around body 



( lenus (incertae sedis) 



.1/ ulticilia Cienkowsky 

 Flagella originate from anterior end of 

 body 2 



2. Pseudopodia lobose 3 



Pseudopodia ray-like 4 



3. Flagellum arises from nucleus Genus Mastigamoeba F. E. Sch. 



Flagellum independent of nucleus . . Genus Mastigella Frenzel 



4. Stalked forms 5 



Body not stalked; ray-like pseudopodia 



with axial filaments 



(? Genus Dimorphiella) Genus Dimorpha Gruber 



5. Pseudopodia confined to circle about base 



of flagellum Genus Pteridomonas Penard 



Pseudopodia not limited to flagellum region 



Genus Actinomonas S. Kent 

 Family 2. Oicomonadidae Senn. 



1. Individuals not cup-dwelling 2 



Individuals cup-dwelling 6 



2. Form flattened, leaf-like Genus Ancyromonas S. Kent 



Form spheroidal to ellipsoidal 3 



3. Not parasitic ... . 4 

 Parasitic — cause of "blackhead" in turkeys 



Genus Histomonas Tvzzer 



4. Kinetoplast marginal 5 



Kinetoplast not marginal Genus Proleptomonas Woodcock 



5. Flagellum delicate, short, active. . . .Genus Oicomonas S. Kent 

 Flagellum heavy, long, sluggish .... Genus Rigidomastiz Alexeieff 



6. Cup stalked Genus Codonoeca J. Clark 



Cup without stalk Genus Platytheca Stein 



