Family: Apex somewhat to much fan-shaped; oral region along apex, may extend ventrally (Illustrated Guide, 1985). Cytostome slit-like, situated apically on non-ciliated ridge of the body (Carey, 1992).
Genus: Body long to ovoid; apex fan-shaped; toxicysts evenly distributed along edge of apex (Illustrated Guide, 1985). Body elongate, circular in cross section; antrerior obliquely truncated, surmounted by an unciliated apical ridge, which is lined with trichocysts; cytostome slit-like (Carey, 1992). Very many species (Corliss, 1979).

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Oral region only along apex, not extend ventrally
S. cultiforme ? or Arcuospathidium ? 590 μm, Kurihashi Saitama, 2001	S. syrtis or Epispathidium ? 162 μm Uruguay, 1999	S. syrtis or Epispathidium ? 115 x 48 μm Oura central p. Oura Gunma, 2006
S. spathula ? 240 x 95 μm Sakitama-kofun p. Gyoda Saitama, 2004	S. spathula ? 86 μm posterior rounded Urawa Saitama, 2001
S. caudatum ? 130 μm posterior tapered Uruguay, 1999	S. muscicola ?? 107-125 μm Uruguay, 1999	S. muscicola ?? μm Koshigaya Saitama, 2001	Spathidium sp. 63 μm Japan, 199?
Spathidium sp. ? μm Koaze river Saitama, 2002	Spathidium sp. ? μm Matsubushi Saitama, 2003	Spathidium sp. ? μm Naruto Chiba, 2003	Spathidium sp. 70 x 29 μm Ichino-kawa Namegawa Saitama, 2004
Spathidium sp. 122 x 38 μm Watarase river Ashikaga Tochigi, 2004	Spathidium sp. 58 x 12 μm drainage ditch Fujimi Gunma, 2005
Oral region extend ventrally
Spathidium sp. x 200 365 μm Yamagata, 1999	Spathidium sp. 330 x 190 μm Kejo-numa 1 Osaki Miyagi, 2006	Spathidium sp. 60 μm Japan, 199?	Spathidium sp. ? μm Ageo Saitama, 2003

Similar genus -->> Bryophyllum

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