Orbopercularia Lust, 1950 (ref. ID; 1555, 2014)
Class Oligohymenophora: Subclass Peritricha: Order Peritrichida: Suborder Sessilina (ref. ID; 2014)

[ref. ID; 2014]
Colonial. Inverted bell-shaped zooids mounted upon a branched non-contractile stalk. The peristome lacks a lip and its rim may be scalloped. The macronucleus always rounded, never elongate or C-shaped, and usually located in a mid-lateral position in the body. Species are often epizooic. The genus is most easily confused with Opercularia from which it differs only by the shape of the macronucleus.
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)

[ref. ID; 1555]
Type species; Orbopercularia berberina (Lust) Lust, 1950 (ref. ID; 1555)