Chapter 13 

 Order 2 Protomonadina Blochmann 



THE protomonads possess one or two flagella and are com- 

 posed of a heterogeneous lot of Protozoa, mostly parasitic, 

 whose affinities to one another are very incompletely known. The 

 body is in many cases plastic, having no definite pelhcle, and in 

 some cases amoeboid. The method of nutrition is holozoic, or 

 saprozoic (parasitic). Reproduction is, as a rule, by longitudinal 

 fission, although budding or multiple fission has also been known 

 to occur, while sexual reproduction, though reported in some 

 forms, has not been confirmed. 



With 1 flagellum 



With cytoplasmic collar 



Collar enclosed in jelly Family 1 Phalansteriidae 



Collar not enlosed in jelly 



Without lorica Family 2 Codosigidae 



With lorica Family 3 Bicosoecidae (p. 241) 



Without cytoplasmic collar 



Free-living Family 4 Oikomonadidae (p. 243) 



Parasitic Family 5 Trypanosomatidae (p. 244) 



With 2 flagella 



With undulating membrane Family 6 Cryptobiidae (p. 252) 



Without undulating membrane 



Flagella equally long Family 7 Amphimonadidae (p. 253) 



Flagella unequallj' long 



no traiUng flagellum Family 8 Monadidae (p. 255) 



one flagellum trailing Family 9 Bodonidae (p. 256) 



Family 1 Phalansteriidae Kent 



Genus Phalansterium Cienkowski. Small, ovoid; one flagellum 

 and a narrow collar; numerous individuals are embedded in gelat- 

 inous substance which presents a dendritic form, with protruding 

 flagella; fresh water. 



P. digitatum Stein (Fig. 109, a). Cells about 17/i long; oval; 

 colony dendritic; fresh water among vegetation. 



Family 2 Codosigidae Kent 



Small flagellates, sometimes with second flagellum which serves 

 for fixation of body; delicate collar surrounds flagellum; ordina- 



239 



