Genus: Oval, flattened; more or less rigid; flagella arise from a cytostome, one trailing; protrusible cytopharynx a long conical tubule (siphon) almost reaching posterior end; fresh water (Kudo, 1966).

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Cell-body length more than 25 μm: posterior rounded
E. sulcatum ? 29-32 x 16 μm Japan, 199?	E. sulcatum ? 31 x 19 μm Japan, 199?	E. sulcatum ? 29 x 15 μm 6 grooves Japan, 2000	E. sulcatum ? 28 x 16 μm 5 grooves Chichibu Muse Park Saitama, 2003
E. sulcatum ? 28 x 13 μm 6 grooves Misato town Saitama, 2003	E. sulcatum ? 27 x 16 μm 5 grooves Japan, 199?	E. sulcatum ? 27 x 16 μm 5 grooves Ibaraki, 2000	Entosiphon sp. 27 x 16 μm groove wide, few anterior fl. short Gyoda Saitama, 2001
Entosiphon sp. 25 x 16 μm groove wide, few anterior fl. short Chiba, 2000	Entosiphon sp. 25 x 16.5 μm groove wide, few anterior fl. short Shikinawa-ike Fukuoka, 2001	Entosiphon sp. 25 x 15.5 μm Akasaka-numa Hasuda Saitama, 2002	Entosiphon sp. μm Senjo-ga-hara Nikko Tochigi, 2003
Entosiphon sp. μm Ishikiriba Shirakawa Fukushima, 2003	Entosiphon sp. μm Watarase river Ashikaga Tochigi, 2004	E. sulcatum ? 25 x 15 μm Onnenai Kushiro marsh Hokkaido, 2005
Cell-body length more than 25 μm: posterior tapered
Entosiphon sp. 26 x 14 μm posterior tapered Japan, 199?	Entosiphon sp. 25 x 12 μm posterior tapered Japan, 199?	Entosiphon sp. 25 x 14 μm posterior tapered USA, 1999	Entosiphon sp. μm a dividing cell Kaga Ishikawa, 2000
Entosiphon sp. μm a drainage ditch Yachiyo Chiba, 2008	Entosiphon sp. μm Omine-numa 6 Minakami Gunma, 2007	Entosiphon sp. cell μm Japan, 1998	Entosiphon sp. cell division Japan, 1998
Cell-body length less than 25 μm: posterior rounded
E. sulcatum 25 x 12 μm Higashi-sano Hakuba Nagano, 2004	E. sulcatum 24 x 11 μm siphon long Ageo Maruyama Park Saitama, 2002	E. sulcatum 24 x 13.5 μm Gyoda Saitama, 2001	E. sulcatum 22 x 10 μm Japan, 199?
E. sulcatum 23 x 10 μm cell division Japan, 1999	E. sulcatum 24 x 14 μm Uruguay, 1999	E. sulcatum 24 x 14 μm Iwatsuki Saitama, 2002	E. sulcatum ? 21 x 15 μm siphon short Tochigi, 2001
E. sulcatum ? 21 x 12.5 μm Kiyose Tokyo, 2003	E. sulcatum ? 23 x 16 μm Kiyose Tokyo, 2004	E. sulcatum 20 x 11.5 μm Moroyama Saitama, 2003	E. sulcatum 21 x 12 μm Kannon-numa Shimogo Fukushima, 2005
E. sulcatum 21 x 12 μm Hazama marsh Ashikaga Tochigi, 2006	Entosiphon sp. 18 x 14 μm Kagami-gawa G.A. Kochi, 2002

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