Chapter 14 

 Order 2 Protomonadina Blochmann 



THE protomonads possess one or two flagella and are composed 

 of a heterogeneous lot of Protozoa, mostly parasitic, whose af- 

 finities to one another are very incompletely known. The body is in 

 many cases plastic, having no definite pellicle, and in some forms 

 amoeboid. The method of nutrition is holozoic, or saprozoic (para- 

 sitic). 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 collar 



Collar enclosed in jelly Family 1 Phalansteriidae 



Collar not enclosed in jelly 



Without lorica Family 2 Codosigidae 



With lorica Family 3 Bicosoecidae (p. 341) 



Without collar 



Free-living Family 4 Oikomonadidae (p. 343) 



Parasitic Family 5 Trypanosomatidae (p. 344) 



With 2 flagella 



With undulating membrane Family 6 Cryptobiidae (p. 357) 



Without undulating membrane 



Flagella equally long Family 7 Amphimonadidae (p. 358) 



Flagella unequally long 



No trailing flagellum Family 8 Monadidae (p. 360) 



One flagellum trailing Family 9 Bodonidae (p. 362) 



Family 1 Phalansteriidae Kent 



Genus Phalansterium Cienkowski. Small, ovoid ; one flagellum and 

 a small collar; numerous individuals are embedded in gelatinous 

 substance, with protruding flagella; fresh water. 



P. digitatum Stein (Fig. 138, a). Cells about 17ju long; oval; colony 

 dendritic; fresh water among vegetation. 



Family 2 Codosigidae Kent 



Small flagellates; delicate collar surrounds flagellum; ordinarily 

 sedentary forms; if temporarily free, organisms swim with flagellum 

 directed backward; holozoic on bacteria or saprozoic; often colonial; 

 free-living in fresh water. Feeding process (Lapage, 1925). 



Genus Codosiga Kent (Codonocladium Stein; Astrosiga Kent). In- 

 dividuals clustered at end of a simple or branching stalk ; fresh water. 



339 



