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).

Tohoku ------------------------------------------------------------------------
S. pyriformis 230 x 125 μm Tashirodaira m. Hakkoda mountain Aomori, 2005	S. pyriformis 280 x 190 μm Tashirodaira m. Hakkoda mountain Aomori, 2006	S. pyriformis 220 x 120 μm Kenashitai Hakkoda mountain Aomori, 2005
S. pyriformis μm Kuroyachi marsh Hachimantai Iwate, 2007	S. pyriformis 340 x 170 μm Sensho-ga-hara Shizukuishi Iwate, 2007	S. pyriformis 300 x 160 μm near Ningyo-ishi Azuma mt. Yamagata, 2007
S. pyriformis 492 x 240 μm Jodo-daira 3 Azuma mountain Fukushima, 2006	S. pyriformis 400 x 296 μm Jodo-daira 2 Azuma mountain Fukushima, 2006
Kanto ------------------------------------------------------------------------
S. pyriformis μm Yokotashiro 2 Katashina Gunma, 2007	S. pyriformis Kinu-numa m. Nikko Tochigi, 2010
S. fuliginosus ? or S. pyriformis ? μm USA, 1999 Movies	S. fuliginosus or S. pyriformis ? μm Ko-numa Tsukiyono Gunma, 2003

Similar species ->> Stentor fuliginosus; Stentor polymorphus;

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