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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 93 μm long, 60 μm wide, L/W=, x 640, No.4, Yokotashiro, Oze-ga-hara (Oze marsh), Katashina village, Gunma Pref., Japan, August 3, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Amphitrema stenostoma Amphitrema stenostoma
Test μm long, μm wide, L/W=, x 640
Amphitrema stenostoma Amphitrema stenostoma
Test μm long, μm wide, L/W=, x 640
Amphitrema stenostoma Amphitrema stenostoma

Images of collecting locality: No.4, Yokotashiro, Oze-ga-hara (Oze marsh), Katashina village, Gunma Pref., Japan, August 3, 2008 by Y. Tsukii

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