Genus: When extended, trumpet-shaped or cylindrical; highly contractile; some with mucilaginous lorica; conspicuous peristomal field frontal; contractile vacuole anterior-left; fresh water (Kudo, 1966).
Species: Cell body broadly trumpet shaped, up to 700 μm long when fully extended; macronucleus consists of two (rarely one, three, four or five) isolated beads; cortical granules colourless; with symbiotic green algae (Foissner and Wölfl, 1994).

S. pyriformis μm Yokotashiro 2 Katashina Gunma, 2007	S. pyriformis 230 x 125 μm Tashirodaira m. Hakkoda mountain Aomori, 2005	S. pyriformis μm Niigata, 2001	S. pyriformis ? 300 x 160 μm near Ningyo-ishi Azuma mt. Yamagata, 2007
S. pyriformis μm near Yamakado m. Nishi-Azai Shiga, 2008	S. pyriformis ? μm USA, 1999 Movies	S. pyriformis ? 280 x 190 μm Tashirodaira m. Hakkoda mountain Aomori, 2006	S. pyriformis ? 340 x 170 μm Sensho-ga-hara Shizukuishi Iwate, 2007
S. pyriformis or S. fuliginosus ? μm Ko-numa Tsukiyono Gunma, 2003	S. pyriformis or S. fuliginosus ? 320 x 90 μm Iroha-numa Zao mountain Yamagata, 2005	S. pyriformis or S. fuliginosus ? μm Kenashitai Hakkoda mountain Aomori, 2005	S. pyriformis or S. fuliginosus ? μm Kannon-numa 1 Shimogo Fukushima, 2008
S. pyriformis Kinu-numa m. Nikko Tochigi, 2010

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