Genus: Cigar- or foot-shaped; a single macronucleus and 1 to several vesicular or compact microuclei (Kudo, 1966). Anterior rounded or obliquely truncated, posterior rounded or tapered; cell body asymmetrical due to a depression of the ventral surface (oral groove) running from the apex of the cell to about the middle of the body; oral aperture (cytostome) at its posterior end; somatic ciliation uniform; trichocysts present; one or more contractile vacuoles present; macronucleus ovoid or reniform (Carey, 1992).

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P. caudatum intact cells 206-260 μm	P. caudatum conjugation	P. caudatum cell cortex	P. caudatum cell division
Paramecium sp. anter. truncated 2-3 C.V. Furu-tone river Kasukabe Saitama, 2004	P. aurelia 1 sample 119-125 μm	P. multi- micronucleatum 2 samples 250 x μm	P. jenningsi 1 sample 140 x μm
P. bursaria 19 samples 95-150 μm Japan, 199?-2008	P. trichium 13 samples 77-98 x μm Japan, 1998-2008	P. polycaryum 1 sample 138-153 x μm	P. duboscqui 1 sample 115 x 52 μm 125 x 50 μm
Paramecium sp. cortical patterns Kawashima or Kawajima Saitama, 2002	Paramecium sp. C.V. pores Takamatsu Kagawa, 2002	Paramecium sp. μm Uruguay, 1999

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