Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985). Undulating membrane absent; lacnur canal from contractile vacuole (Carey, 1992).

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Peristome more than 2/3 of the cell length; macronucleus moniliform
S. ambiguum 1200 x 100 μm peri. > 3/4 Uruguay, 1999	S. ambiguum 1140 x 196 μm Diamond marsh Shiga highland Nagano, 2004	S. ambiguum 1060 x 75 μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005	S. ambiguum 880 x 72 μm peri. = 3/4 Sugadaira Nagano, 2001
S. ambiguum 820 x 88 μm peri. = ? Ichikawa Chiba, 2001	S. ambiguum 730 x 38 μm Kodanuki marsh Fujinomiya Shizuoka, 2005	S. ambiguum 568 x 38 μm peri. = 2/3 Ichikawa Chiba, 2001	S. ambiguum 510 x 36 μm peri. = 2/3 Iruma river Kawagoe Saitama, 2004
S. ambiguum ? 452 x 56 μm peri. = 2/3 Japan, 1999	S. ambiguum 450 x 70 μm peri. = 2/3 Kiyose Tokyo, 2001	S. ambiguum μm Omine-numa Minakami Gunma, 2008
Peristome about half of the cell length; macronucleus moniliform
S. intermedium 800 μm Japan, 199?	S. intermedium macronuclei Japan, 199?	S. intermedium cell division Japan, 1997	S. intermedium 790 μm Ichikawa Chiba, 2001
S. intermedium 560,760 x μm Nidanuma Tsuchiyu-onsen Fukushima, 2005	S. intermedium 600 x μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005	S. intermedium ? Japan, 199?	S. intermedium cell μm Japan, 1998
S. intermedium cell μm Japan, 1998	S. intermedium cell μm Japan, 1998	S. intermedium μm Kanazawa Ishikawa, 2002	S. intermedium 350 x 20 μm ? Futayo-no-ike Haguro mountain Yamagata, 2005
Peristome less than half of the cell length; macronucleus ellipsoidal
S. teres 534 x 38 μm Iroha-numa Zao mountain Yamagata, 2005	S. teres 500 x 44 μm peri. = 2/5 cell division Japan, 1999	S. teres 320 x 30 μm peri. = 2/5 mac. ellipsoidal Japan, 1998	S. teres 194 x 27 μm peri. = 2/5 mac. ellipsoidal Mishima Shizuoka, 2001
S. teres cell μm peri. = 2/5 ? Japan, 1998	S. teres 460 x 520 μm peri. = 1/3 mac. ellipsoidal Uruguay, 1999	S. teres 460 x 54 μm 360 x 40 μm peri. = 1/3 mac. ellipsoidal Matsumoto Nagano, 2001	S. teres 330 x 16 μm mac. ellipsoidal Shide-numa Kita-kawabe Saitama, 2005
S. teres 500 x 80 μm peri. = 1/4 mac. ellipsoidal Ichikawa Chiba, 2001	S. teres ? tail long 520 x 50 μm peri. = 1/4 mac. ellipsoidal Ichikawa Chiba, 2001	S. teres 300 x 64 μm cell contracted peri. = 1/4? Mac. ellipsoidal Kasai Seaside p. Tokyo, 2001	S. teres 280 x 76 μm near Dedono-yu Nishiwaga Iwate, 2007
Peristome less than half of the cell length; macronucleus moniliform
S. minus 800 x 24 μm peri. = 1/3 Japan, 1998 Movies	S. minus 780 x 34 μm peri. = 1/3 mac. moniliform USA, 1999	S. minus μm Kareki-numa Nikko Tochigi, 2008	S. minus cell μm Japan, 1998
Peristome less than half of the cell length; macronucleus oval (one or two)
S. filum 820 x 80 μm peri. < 1/4 Japan, 199?	S. filum 720 x 30 μm Iyari marsh 3 Omachi Nagano, 2007	S. filum 330 x 18 μm Karakemi marsh 1 Omachi Nagano, 2007	Spirostomum sp. 275 x 31 μm peri. = 1/3 two mac. Ushiku Ibaraki, 2002

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