Stentor pyriformis, algal endosymbionts present, cell body 340 μm long, 170 μm wide, L/W=2.0, x 200, x 400, x 640, No.5, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii
50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640