302 



PROTOZOOLOGY 



longer one as long as body, shorter one ^; body 40-50/* by 8-10/*; 

 salt water. 



Genus Euglenamorpha Wenrich. Body form and structure similar 

 to those of Euglena, but with 3 flagella; in gut of frog tadpoles. One 

 species. 



E. hegneri W. (Fig. 120, k). 40-50/* long (Wenrich, 1924). 



Family 2 Astasiidae Butschli 



Similar to Euglenidae in body form and general structure, but 

 without chromatophores; body highly plastic, although usually 

 elongate spindle. 



Genus Astasia Dujardin. Body plastic, although ordinarily elon- 

 gate; fresh water or parasitic (?) in microcrustaceans. Many species 

 (Pringsheim, 1942). Bacteria-free cultivation (Schoenborn, 1946). 



A. klebsi Lemmermann (Fig. 122, a). Spindle-form; posterior 



Fig. 122. a, Astasia klebsi, X500 (Klebs); b, Urceolus cyclostomus, 

 X430 (Stein); c, U. sabulosus, X430 (Stokes); d, Petalomonas mediocanel- 

 lata, X1000 (Klebs); e, Rhabdomonas incurva, X1400 (Hall); f, Scyto- 

 monas pusilla, X430 (Stein). 



portion drawn out; flagellum as long as body; plastic; paramylon 

 bodies oval; 40-50/* by 13-20/*; stagnant water. 



Genus Urceolus Mereschkowsky (Phialonema Stein). Body color- 

 less; plastic; flask-shaped; striated; a funnel-like neck; posterior 

 region stout; a single flagellum protrudes from funnel and reaches in- 

 ward the posterior third of body; fresh or salt water. 



U. cyclostomus (Stein) (Fig. 122, b). 25-50/* long; fresh water. 



U. sabulosus (Stokes) (Fig. 122, c). Spindle-form; covered with 

 minute sand-grains; about 58/* long; fresh water. 



Genus Petalomonas Stein. Oval or pyriform; not plastic; pellicle 

 often with straight or spiral furrows; a single flagellum; paramylon 



