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 200-300 μm long when fully extended; a single macronucleus and several micronuclei; cortical and cytoplasmic granules yellow-brown or red-orange coloured; with symbiotic green algae (Foissner and Wölfl, 1994).

S. fuliginosus μm Kuroyachi marsh 2 Hachimantai Iwate, 2007	S. fuliginosus 250 x 190 μm Mida-ga-hara Gassan Yamagata, 2005	S. fuliginosus μm Shibakusadaira Zao mountain Miyagi, 2007
S. fuliginosus 300 x μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	S. fuliginosus 360 x 104 μm Mizunashi-Yachi Komado marsh Fukushima, 2007	S. fuliginosus μm Miyatoko m.3 Minami-Aizu Fukushima, 2008
S. fuliginosus 310 x 150 μm near Omine-numa Minakami Gunma, 2006	S. fuliginosus 300 x 212 μm near Omine-numa Minakami Gunma, 2007	S. fuliginosus 260 x 140 μm Omine-numa 3 Minakami Gunma, 2007	S. fuliginosus μm Numappara marsh 3 Nasu-shiobara Tochigi, 2007
S. fuliginosus μm Iyari marsh 4 Omachi Nagano, 2007	S. fuliginosus μm Hyoutan-ike Shiga highland Nagano, 2007	S. fuliginosus 290-340 x 124 μm Hasu-ike Shiga highland Nagano, 2005	S. fuliginosus 280 x 124 μm Ushidome-ike Norikura highland Nagano, 2005
S. fuliginosus 230 x 110 μm Karakemi marsh Yasaka Nagano, 2005	S. fuliginosus 230 x 164 μm Kodanuki marsh Fujinomiya Shizuoka, 2006

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