Family (de Puytorac and Corliss, 1979): Body elliptical, with right side slightly concave and anterior end a little narrower than posterior; generally large in size; dense somatic ciliation interspersed with longer bristles; buccal cavity medially located on ventral side with scutico-vestige (velum); two macronuclei with several micronuclei; both fresh water and marine habitats (Corliss, The Ciliated Protozoa, 1979).
Genus: Ovoid; ciliation uniform; long stiff cilia (bristles) distributed over the body surface; peristome deep, both anterior and posterior regions with a well-developed membranes connected with undulating membrane (velum); two macronucleus; 1-2 micronuclei; several contractile vacuoles; fresh water (Kudo, 1966).

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H. natans 63 x 38 μm Onnenai Kushiro marsh Hokkaido, 2005	H. natans μm Ryugahara m.5 Yuri-Honjo Akita, 2008	H. natans 82 x 48 μm Futayo-no-ike Haguro mountain Yamagata, 2005	H. natans 75 x 43 μm Futayo-no-ike Haguro mountain Yamagata, 2006
H. natans 65 x 52 μm Tsutsuji-ga-oka p. Tatebayashi Gunma, 2006	H. natans μm Senjo-ga-hara Nikko Tochigi, 2003	H. natans μm Kareki-numa Nikko Tochigi, 2008	H. natans 61 x 38 μm Ohnuma Nasu-shiobara Tochigi, 2007
H. natans μm Doman G.P. Nishi-Urawa Saitama, 2003	H. natans 70 x 57 μm Saitama, 1999	H. natans 85 x 59 μm Aina-shinsui Park Kawagoe Saitama, 2005	H. natans 65 x 43 μm Shinrin-koen Namegawa Saitama, 2005
H. natans 56 x 40 μm Kitamoto n.o.p. Kitamoto Saitama, 2007	H. natans 48, 59 x μm Jionji-shinsui p. Iwatsuki-ku Saitama, 2006	H. natans 54 x 37 μm Japan, 1998
H. natans 92 x 55 μm Tonbo-no-numa Isumi Chiba, 2007	H. natans μm Oyumi-ike 1 Chuo-ku Chiba, 2008
H. natans 74 x 39 μm Imori pond Myoko highland Niigata, 2004	H. natans 57 x 34 μm Numa-no-hara m. Madarao highland Niigata, 2005	H. natans 57 x 40 μm Ikenokochi marsh Tsuruga Fukui, 2004
H. natans 50 x 35 μm Tane-ike Togakushi highland Nagano, 2006	H. natans μm Dojo-ike 2 Norikura highland Nagano, 2007	H. natans 61 x 369 μm Koigakubo marsh Tessei-cho Okayama, 2004	H. natans 70 x 42 μm Kashibaru m.6 Karatsu Saga, 2006

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