| 1 | 
 
 | 
Difflugia limnetica
 --- by Yoshino, Hiromi at the University of Ryukyus  | 
| 2 | 
 
 | 
Difflugia lobosotoma
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 3 | 
 
 | 
Difflugia tuberculata (x 640)
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 4 | 
 
 | 
Difflugia corona
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 5 | 
 
 | 
Difflugia mammilaris, 
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 6 | 
 
 | 
Difflugia mammilaris, 
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 7 | 
 
 | 
Difflugia amphora (x 400), 
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 8 | 
 
 | 
Difflugia globulosa (x 400), 
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 9 | 
 
 | 
Difflugia globulosa (x 400), 
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 10 | 
 
 | 
Difflugia globulosa (x 400), 
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 11 | 
 
 | 
Difflugia acuminata
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 12 | 
 
 | 
Difflugia acuminata
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 13 | 
 
 | 
Difflugia oblonga, 
 --- by Yoshino, Hiromi at the University of Ryukyus  | 
| 14 | 
 
 | 
Difflugia pyriformis, 
 --- by Mikami, Kazuyuki at Miyagi Univ. of Education  | 
| 15 | 
 
 | 
Difflugia pyriformis, 
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  | 
| 16 | 
 
 | 
Difflugia pyriformis, 
 --- by Tsukii, Yuuji at Lab. of Biol., Hosei Univ.  |