Family: Paroral dikinetid ciliated entire length, not curved bypellicular structures (Illustrated Guide, 1985).
Genus: Oral polykinetids straight, never sigmoid (Illustrated Guide, 1985). Small, ovoid or pyriform, anterior pointed; cytostome anterior 1/3 of body where an undulating membrane on the right and three small membranelles on the left; macrostome forms with large buccal ciliation; somatic ciliation complete; a contractile vacuole terminal; a spherical macronucleus central (Carey, 1992).

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T. thermophila axenic culture 55-80 x 27-37 μm Japan, 199?	T. thermophila silver stain 57-76 x 29-45 μm Japan, 199?	Tetrahymena sp. 47-57 x 22-26 μm Japan, 199?	Tetrahymena sp. x 1000 μm Japan, 199?
Tetrahymena sp. fast green stain μm Japan, 199?	Tetrahymena sp. silver stained 65-75 x 34-44 μm Japan, 199?	Tetrahymena sp. 75 x 40 μm Japan, 199?	Tetrahymena sp. μm Japan, 199?
Tetrahymena sp. μm Uruguay, 1999	Tetrahymena sp. μm Saitama, 1999	Tetrahymena sp. μm Yamagata, 1999	Tetrahymena sp. ? or Sathrophilus ? μm Japan, 2000
Tetrahymena sp. 37 x 18 μm Kabuto-yama Nishi-no-miya Hyogo, 2004	stock Tms-1c axenic culture 51-58 x 21-28 μm ??? Tochigi, 2004	Tetrahymena sp. 78 x 35 μm drainage ditch Kisai Saitama, 2006	Tetrahymena sp. 56 x 32 μm Akasaka-numa Iwatsuki-ku Saitama, 2006

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