|  Genus: Both ends blunt (Illustrated Guide, 1985).  
Similar to Condylostoma, but lacks undulating membrane; with ciliated peristomal field (How to know the protozoa, 1979).  
Ovoid and flattened in shape; somatic ciliation uniform; peristome, with a large conspicuous AZM on the left edge, 
spirals down to the cytostome; right edge lacks undulating membrane; a contractile vacuole posterior, connected 
to two longitudinal canals (Carey, 1992). Species: | 
 
 
 
Chlimacostomum sp., 
cell body 110 μm long, 95 μm wide, 
x 100, x 200, x 400, Shirasaka, Shirakawa, Fukushima Pref., October 1999, collected by H. Shiomizu, photo by Y. Tsukii
![]() 50 μm
 50 μm
![]() 100 μm
 100 μm
![]() 150 μm; x 400
 150 μm; x 400
 
 
 
 
![]() 31 μm
 31 μm
![]() 63 μm
 63 μm
![]() 94 μm; x 640
 94 μm; x 640
 
 
