Genus: Ovoid to cylindrical; ciliation uniform; oral basket made up of double trichites which end up deep in ectoplasm; contractile vacuole terminal (Kudo, 1966). Brosse as 3 longitudinal files (Illustrated Guide, 1985). Body ellipsoidal, ovoid or cylindrical in shape; cytostome apical, circular; cytopharynx equipped with well-developed double nematodesmata; somatic ciliation uniform, kinetosomes paired; macronucleus ovoid, reniform or ellongate; as many species descriptions are insufficient, many are indistinguishable (Carey, 1992).

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Prorodon sp. 420 μm Ichikawa Chiba, 2001	P. moebiusi 213 μm Japan, 1998 Movies	P. moebiusi 210 μm Japan, 1998 Movies	P. moebiusi ? 203 x 104 μm Kitayama park Nishi-no-miya Hyogo, 2004
P. discolor or Holophrya ? 125 μm Saitama, 1999	P. teres or H. teres 200 μm, x 200 Japan, 1997	P. teres or H. teres 198 μm, x 200 Japan, 199?	P. teres or H. teres 170 μm, x 200 Japan, 199?
P. viridis or H. ovum ? 141 μm with Chlorella Sanda Hyogo, 2001	P. viridis or H. ovum ? 193 μm, x 200 cyto. vacuolated Mishima Shizuoka, 2001	P. viridis ? cell μm Japan, 1998	Prorodon sp. 356 x 155 μm Komado marsh Showa & Tajima Fukushima, 2007
P. ovum 125 x 75 μm Japan, 1997	P. ovum 119 x 63 μm Japan, 1997	P. ovum 106 x 56 μm Tanohara Natural p. Ontake highland Nagano, 2005	P. ovum 100 x 69 μm Japan, 199?
P. ovum 100 x 45 μm Japan, 1997	P. ovum ? 75 μm Tatebayashi Gunma, 2001	P. ovum ? 76 x 50 μm Mishima Shizuoka, 2001
Prorodon sp. or Uronema ? 78 x 50 μm Hanasaki water p. Kazo Saitama, 2005	P. minutus ? 73 μm Saitama, 1999	Prorodon sp. 48 x 22 μm Japan, 1998
P. elegans 100 μm, x 400? Yamagata, 1999	Prorodon sp. or Rhagadostoma ? 51 μm, x 640 Saitama, 1999	Prorodon sp. or Rhagadostoma ? μm, x 640 Wan-park-land Kochi, 2002	P. diaphanus 41 x 27 μm 30 x 20 μm Japan, 1999
P. diaphanus ? μm Japan, 1999	Prorodon sp. 105 x 56 μm Oura central p. Oura Gunma, 2006

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