Family: Attached by flexbile podite; body laterally compressed (Illustrated Guide, 1985).
Genus: Cilia in groove, opening to right; margins smooth; body kineties complete (Illustrated Guide, 1985). Usually ovoid, ventral surface flattened; dorsal domed and longitudinally ribbed with a cleft on the right lateral edge; a large podite with secretory canal posterior; somatic ciliation restricted to ventral surface; a large macronucleus central; two contractile vacuoles (Carey, 1992).

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D. calkinsi ? 32 x 20 μm Japan, 1998	D. calkinsi ? 28 x 16 μm Saitama, 1999	D. calkinsi ? 28 x 18 μm Sayama Saitama, 2001	D. calkinsi ? 27 x 18 μm Akigase Park Saitama, 2002
D. calkinsi ? 24 x 15 μm Lake Kawaguchi Yamanashi, 2001	D. calkinsi ? 23 x 12.5 μm Japan, 1999	D. calkinsi ? 23 x 15 μm Japan, 1998	D. calkinsi ? 22 x 14 μm Koshigaya Saitama, 2001
D. calkinsi ? 32 x 18 μm Omoi river Oyama Tochigi, 2004	D. calkinsi ? 28 x 19 μm Kawaguchi N.P. Kawaguchi Saitama, 2006	D. calkinsi ? 25 x 15 μm Hanasaki water p. Kazo Saitama, 2005	D. navicula 23 x 12 μm Saitama, 1999
Dysteria sp. ? 42 x 27 μm Kurome river Asaka Saitama, 2004

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