Cinetochilum Perty, 1849 (ref. ID; 2014, 7452)
Class Oligohymenophora: Subclass Hymenostomata: Order Scuticociliatida (ref. ID; 2014)
Order Scuticociliatida (ref. ID; 7040)

[ref. ID; 2014]
Small (20-30 um diameter) discoid ciliate, flattened dorso-ventrally. Apical pole rounded, terminal pole slightly truncate. Oral aperture displaced to the lower right quadrant of the ventral surface. The position and angle of the membranelles appear to be rather variable, but the undulating membrane extends around complete right edge of the aperture. Somatic ciliation comparatively sparse, usually in about 20 rows, arising from paired kinetosomes. The somatic kineties are horseshoe-shaped, centered around the oral aperture and in some cases are borne upon distinctive ridges which give the edges of the cell a crenulated appearance. There are several caudal cilia present. Contractile vacuole sub-terminal. Spherical macronucleus centrally located with an adjacent micronucleus.
Quote; Colin R. Curds, Michael A. Gates and David McL. Roberts "British and other freshwater ciliated protozoa Part II Ciliophora: Oligohymenophora and Polyhymenophora" Cambridge University Press, 1983 (ref. ID; 2014)

Cinetochilum margaritaceum Perty, 1852 (ref. ID; 1308, 1622, 1629, 2086, 2245, 3116) reported year? (ref. ID; 1219, 1618, 3342, 3698, 3771, 5462)
Syn; Cyclidium margaritaceum Ehrenberg, 1830 (ref. ID; 3116); Glaucoma margaritaceum Claparede & Lachmann, 1858 (ref. ID; 3116)
Description; Body shape oval to ellipsoid, flattened; ciliation present only on the ventral surface, 3 or 4 caudal cilia; buccal cavity in the right posterior part of the cell, membranes situated on both edges of the buccal cavity, the right one forming a pocket; 1 spherical macronucleus and 1 micronucleus in the central part of the cell; 1 contractile vacuole near to the left posterior end; trichocysts present all over the body. (ref. ID; 1219)
In fresh and brackish water. (ref. ID; 1618)
Measurements; Length 15-45 um. (ref. ID; 1219, 1618)
26-30 x 22-25 um. (ref. ID; 3342)