 
 
Oligohymenophorea
(formerly Nassophorea): Peniculida: Frontoniina: Frontoniidae
Frontonia depressa
(Stokes, 1886) 
Frontonia parvula Penard, 1922
|  Genus: Postoral kineties usually to left of oral poykinetids (Illustrated Guide, 1985).  
Left edge is more curved than right edge; cytopharynx with numerous strong fibrils; ectoplasm with 
numerous fusiform trichocysts; macronucleus oval; one to several micronulei (Kudo, 1966). Species: 
Cell body 60-80 μm long; macronucleus short sausage-shaped; a single micronucleus; a single contractile vacuole 
(Kahl, 1930).
 | 
Similar Genus --> Disematostoma
Frontonia depressa (Stokes) ?, 
cell body 75 μm long, 44 μm wide, L/W=1.7, 
x 640, No.1, Azami-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., November 4, 2007 by Y. Tsukii
 31 μm
 31 μm
 63 μm
 63 μm
 94 μm; x 640
 94 μm; x 640
 
 
 
Images of collecting locality: 
No.1, Azami-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., November 4, 2007 by Y. Tsukii
 
 
 
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