Holophrya Ehrenberg, 1831 (ref. ID; 3540, 3690, 4611) or 1833 (ref. ID; 2013)
Class Kinetofragminophora: Subclass Gymnostomata: Order Prostomatida: Suborder Prostomatina: Family Holophryidae (ref. ID; 2013)

Subgenus Balanophrya Kahl, 1930 (ref. ID; 3540 original paper)

[ref. ID; 2013]
Body shape ovoid to spherical, uniformly ciliated all over body except that in some species there may be a caudal tuft of longer cilia. There is a circular apical oral aperture which leads to a tubular or conical cytopharynx which is usually supported by a delicate basket of trichites. The oral aperture is a simple invagination and is flush with the apical surface, there is no apical collar-like process. Trichocysts often present all over body below the pellicle. Macronucleus ovoid. Contractile vacuole terminal. Feeds on other protozoa.
Quote; Colin R. Curds "British and other freshwater ciliated protozoa Part I Ciliophora: Kinetofragminophora" Cambridge University Press, 1982 (ref. ID; 2013)

Holophrya simplex Schewiakoff, 1893 (ref. ID; 1619, 3115, 3540) reported year? (ref. ID; 1618)
Description; Ellipsoidal; eighteen to twenty ciliary rows; cilia uniformly long; cytostome small; cytopharynx without trichocysts or trichites; contractile vacuole and cytopyge posterior; macronucleus large, round. (ref. ID; 1618)
Measurements; 34 by 18 um. (ref. ID; 1618)