Order: No kinetidal specializations at oral region.
Family: Free swimming; most body kineties bipolar, cytostome apical.
Genus: Cytostome not preceded by invagination lined by body kineties.

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Holophrya sp.1 55 x μm 67 x μm Saitama, 1999	Holophrya sp.2 or Prorodon ? 67 x 41 μm Saitama, 1999	H. gracilis 72 x 44 μm Yoshigadaira m. Shirane mountain Gunma, 2005	Holophrya sp. ? μm Kita-Urawa Park Saitama, 2002
H. haplostoma ? 71 x 64 μm Japan, 1999	H. haplostoma 68 x 63 μm Iruma river Sayama Saitama, 2004	H. haplostoma ? 59 x 54 μm Saitama, 1999	Holophrya ? μm Kannon-numa f.p. Shimogo Fukushima, 2008
Holophrya ? H. nigricans ? 135 x 120 μm Fukuoka, 2001	Holophrya ? μm Oyomi marsh 2 Hakuba Nagano, 2008	Holophrya sp.3 ? 110 x 19 μm Saitama, 1999

Similar Genus -->> Prorodon

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