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: Rose-colored or colorless; 200-400 μm long; macronucleus oval; ciliation uniform (Kudo, 1966).

S. igneus intact cells 213 μm Japan, 1998	S. igneus flattened cells μm Japan, 1998	S. igneus a conjugating pair Japan, 1998	S. igneus cysts μm Japan, 1998
S. igneus 152-460 x 60 μm Shibayama-shigou Shobu Saitama, 2005	S. igneus 340 x 70 μm 280 x 80 μm Hakama marsh Madarao highland Niigata, 2005	S. igneus 380 x 70 μm Hakama marsh Madarao highland Niigata, 2005	S. igneus x 95 μm Numa-no-hara Madarao highland Niigata, 2005
S. igneus x 95 μm Kurome river Asaka Saitama, 2006	S. igneus 200 x 105 μm Kamino-tanbo Tsugaike highland Nagano, 2006	S. igneus 280 x 100 μm Mida-ga-hara 5 Gassan (mt) Yamagata, 2006	S. igneus ? μm Tango-seki p.1 Chuoh-ku Chiba, 2008
S. igneus ? μm Near Omine-numa Minakami Gunma, 2008

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