Order: Hypostomial frange not extensive (Carey, 1992). Medium to large, some >100 μm long; oral polykinetids only next to left rear of cytostome; large cyrtos has complete palisade of nematodesmata (Illustrated Guide, 1985).
Suborder: With few to many "oral" polykinetids as frange from post oral region sidewise to left, sometimes onto dorsum (Illustrated Guide, 1985). Body usually large and cylindrical with simple holotrichous ciliation (Carey, 1992).
Family: Body ellipsoidal, uniformly ciliated; hypostomial frange short; prominent cytopharyngeal apparatus (Carey, 1992).
Genus: Oral aperture small, oval (Carey, 1992).

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Cell body sausage-shaped; many contractile vacuoles
N. elegans 400 x 120 μm L/W= 3.3 cyrtos 25 μm φ 8 or more c.v. trichocysts absent near Ukima Park Tokyo, 2001	N. elegans 240 μm L/W= cyrtos μm φ 6 or more c.v. trichocysts absent Hasuda Saitama, 2002	N. elegans 204 x 84 μm L/W=2.4 cyrtos μm φ trichocysts absent Furu-tone river Kasukabe Saitama, 2004	N. elegans 177 x 71 μm L/W=2.5 cyrtos μm φ trichocysts absent Kurome river Asaka Saitama, 2006
N. elegans 185 μm L/W= cyrtos μm φ 3 or more c.v. trichocysts absent Mihashi Park Saitama, 2002	N. elegans 180 x μm L/W= cyrtos μm φ 3 or more c.v. trichocysts absent Inari Park Toyama, 2002	N. elegans ? ingestion of food L/W= cyrtos μm φ 3 or more c.v. trichocysts absent Inari Park Toyama, 2002
Cell body more than 100 μm long
Trichocysts absent
N. aurea ? 400 x 190 μm L/W= 2.1 cyrtos μm φ Muneoka Shiki Saitama, 2004	N. aurea 237 x 125 μm L/W= 1.9 cyrtos 25 μm φ trichocysts absent Saitama, 2000	N. aurea 275 x 180 μm L/W= 1.5 cyrtos 24 μm φ trichocysts absent Kuroiso Tochigi, 1999	N. aurea ? 203 x 115 μm L/W= 1.8 cyrtos 12 μm φ trichocysts absent Saitama, 2001
N. aurea ? 147 x 76 μm L/W= 1.9 cyrtos 12 μm φ trichocysts absent Urawa Saitama, 2001	N. aurea ? 155 x μm L/W= cyrtos 12 μm φ trichocysts absent Kawashima or Kawajima Saitama, 2002	N. terminalis 185 x 94 μm L/W= 2.0 cyrtos 19 μm φ trichocysts absent Tochigi, 2001	Nassula sp. 138 x μm L/W= cyrtos μm φ Nan-ko Shirakawa Fukushima, 2003
Trichocysts present
Nassula sp. 310 x 256 μm L/W= 1.2 cyrtos ellipsoidal 34 μm trich. rare, 12-13 μm Koaze river Saitama, 2002	N. ornata ? 260 x 200 μm L/W= 1.3 cyrtos 25 μm φ trich. rare, 17 μm Sashi-ohgi Saitama, 2002	N. ornata ? 203 x 150 μm L/W= 1.4 trich. rare μm Komae Tokyo, 2004
N. ornata 130 x 100 μm 150 x 123 μm L/W= 1.2-1.3 cyrtos 18 μm φ trich. many, 6 μm Tochigi, 2001	N. ornata 175 x μm L/W= cyrtos 18 μm φ trich. many, 9 μm Otto-Numa Ibaraki, 2002	N. ornata 330 x 310 μm L/W= cyrtos 18 μm φ trich. many, 9 μm Riverside green l. Sawara Chiba, 2004
Nassula sp. 166 x μm L/W= cyrtos 26 μm φ trich. many, 4-5 μm Higashi-Matsuyama Saitama, 2001	Nassula sp. 113 x 79 μm L/W= 1.4 cyrtos 26 μm φ trich. many, 4-5 μm Tatebayashi Gunma, 2001	Nassula sp. 180 x μm L/W= cyrtos 25 μm φ trich. many?, 8 μm Konosu Saitama, 2003	Nassula sp. 154 x 100 μm L/W= 1.5 cyrtos 26 μm φ trich. rare, 9 μm Akigase park Saitama, 1998
Nassula sp.3 144 μm L/W= ?? cyrtos 10 μm φ trich. many 5-6 μm Asaka Saitama, 2000	Nassula sp. 135 x 90 μm L/W= 1.5 cyrtos μm φ trich. many μm Yoshimi Saitama, 2003	Nassula sp. 183 x μm L/W= cyrtos μm φ O-ike park Yabuki Fukushima, 2003	Nassula sp. 104 x 78 μm L/W= cyrtos μm φ trich. rare, 9 μm Yanase river Fujimi Saitama, 2004
Cell body less than 100 μm long
Trichocysts absent
Nassula sp. 90 μm L/W= cyrtos μm φ trichocysts absent Kanazawa Ishikawa, 2003	N. parva ? 87 μm L/W= 1.9 cyrtos 15 μm φ trichocysts absent Saitama, 2001	N. parva 78 x 45 μm L/W= 1.7 cyrtos 15 μm φ trichocysts absent Higashi-hiroshima Hiroshima, 1998	N. parva ? 78 x 35 μm L/W= 2.2 cyrtos 12 μm φ trichocysts absent Ibaraki, 2000
N. citrea ? 80 x μm L/W= cyrtos μm φ trichocysts absent Higashi-Matsuyama Saitama, 2001	N. citrea ? 70 μm L/W= 2 cyrtos 6 μm φ trichocysts absent ? Kawagoe Saitama, 2001
Nassula sp. 66 x 43 μm L/W= 1.4 cyrtos 8 μm φ trichocysts absent Urawa Saitama, 2001	Nassula sp. move on a filament trichocysts absent Urawa Saitama, 2001	Nassula sp. ingestion of food trichocysts absent Urawa Saitama, 2001	Nassula sp. cysts trichocysts absent Urawa Saitama, 2001
Nassula sp. 55 x 27 μm L/W= 2.0 cyrtos 8 μm φ trichocysts absent Saitama, 1999	Nassula sp. 47 x 22 μm L/W= cyrtos 8 μm φ trichocysts absent Ishibashi Tochigi, 2004	Nassula sp. 41 x 32 μm L/W= 1.3 cyrtos 10 μm φ trichocysts absent ? Saitama, 1999	Nassula sp. ? 80 x 50 μm L/W= 1.6 kenko-fukushi m.p. Koshigaya Saitama, 2005
Trichocysts present
Nassula sp. 78 x 41 μm L/W= 1.9 cyrtos 8 μm φ trich. 5 μm Sayama Saitama, 2001	N. rubens ? 85 x 52 μm L/W= 1.6 cyrtos μm φ Todoroki g.l. Kawasaki Kanawaga, 2004	N. rubens ? 85 x 44 μm L/W= 1.9 cyrtos 9 μm φ trich. many, μm Tochigi, 2001	N. rubens ? 47 x 23 μm L/W= 2.0 cyrtos 6 μm φ trich. many, 4 μm Hanazono Saitama, 2001
N. rubens ? 48 x 20 μm L/W= 2.4 cyrtos 8 μm φ Obihiro-Hasshonochi Obihiro Hokkaido, 2005	N. rubens ? 55 x μm L/W= cyrtos 7 μm φ trich. many, 4 μm Ogose town Saitama, 2003
???
Nassula sp. or Paranassula ? 267 μm L/W= cyrtos μm φ Kurihashi Saitama, 2001	Nassula sp. cysts μm Kamiya Park Konosu Saitama, 2003

Similar species --> Paranassula

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