Family: Cyrtos in rear 1/2 of body, hidden by ventral pellicular fold.
Genus: Cytostome in rear 1/3 of body (Illustrated Guide, 1985). Irregular, almost triangular in shape; anterior pointed; posterior rounded; distinctly flattened with a delicate keeled armour; somatic ciliation reduced; ventrally 3 longitudinal cilary rows; cytostome in a depression at posterior ventral region; tooth-like projection on the left side (Carey, 1992).

->> Description at WPRNO

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M. simulans 34 x 19 μm Japan, 1997	M. simulans 24 x 13 μm Japan, 1999	M. simulans 20 x 12 μm Wan-park-land Kochi, 2002	M. simulans 31 x 16 μm Kuroiso Tochigi, 2002
M. costatus 27 x 17 μm Uruguay, 1999	Microthorax sp.1 22 x 13 μm Japan, 1998 Movies	Microthorax sp. or Kreyella ? 35 x 24 μm Saitama, 1999	Microthorax sp. or Drepanomonas ? 30 x 16 μm Uruguay, 1999
Microthorax ? or Cinetochilum ? 25 μm Japan, 1999	Microthorax sp. 17 x 9 μm Ikenokochi marsh Tsuruga Fukui, 2004

Similar Genus ->> Drepanomonas; Kreyella: Leptopharynx

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