Family (Poche, 1913): Test has 2 or more pseudostomes; pseudopods extend through pseudostomes.
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).

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A. stenostoma 90-95 x 60-63 μm Sukawa highland Kurikoma mountain Akita, 2007	A. stenostoma 110 x 84 μm Sensho-ga-hara Shizukuishi Iwate, 2007	A. stenostoma 80 x 60 μm Tojuro Azuma mountains Yamagata, 2007	A. stenostoma 75 x 50 μm Yahei-daira m. 3 Azuma mountains Yamagata, 2007
A. stenostoma 75 x 56 μm Yahei-daira m. 4 Azuma mountains Yamagata, 2007	A. stenostoma 90 x 58 μm Yahei-daira m. 2 Azuma mountains Yamagata, 2007	A. stenostoma μm Chigo-ike m.1 Shiga highland Nagano, 2008	A. stenostoma 93 x 60 μm Yokotashiro 4 Katashina Gunma, 2008

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