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Granuloreticulosea: Monothalamida: Amphitremidae

 Amphitrema stenostoma
Nüsslin

Amphitrema Genus: Test ovoid, symmetrical, compressed, composed of a transparent membrane with or without adherent extraneous particles (Cash & Wailes, The British Freshwater Rhizopoda and Heliozoa vol. III, 1915).
Species: Test covered with many grains of quartz and various extraneous particles, 55-97 μm long, 31-74 μm wide; pseudostome lacking any collar, cytoplasm containing algal endosymbionts (Cash & Wailes, The British Freshwater Rhizopoda and Heliozoa vol. III, 1915).

Amphitrema stenostoma Nüsslin , test 110 μm long, 84 μm wide, L/W=1.3, x 640, No.12, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Amphitrema stenostoma Amphitrema stenostoma Amphitrema stenostoma
test 100 μm long, 75 μm wide, L/W=1.3, x 400, x 640
Amphitrema stenostoma Amphitrema stenostoma Amphitrema stenostoma

Images of collecting locality: No.12, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii

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