Opisthostomatella Corliss, 1960 (ref. ID; 2013)
Class Kinetofragminophora: Subclass Vestibulifera: Incertae sedis Order Trichostomatida (ref. ID; 2013)

Synonym Opistostomum Ghosh, 1928

[ref. ID; 2013]
Body shape ovoid. Posterior end slightly tapering. Anterior end with 3 lobes, a large ventral lobe and 2 dorsal lobes of which the right is the larger and overlaps the ventral lobe along the right margin. A deep furrow (the vestibulum?) separates the ventral lobe by a shallow notch. There is a long narrow channel (vestibular aperture?) between the 2 dorsal lobes which are both completely edged with membranelle-like organelles. The vestibulum appears to be devoid of cilia. Body uniformly ciliated with those on the right margin being very long. Macronucleus large, spherical and centrally placed with an adjacent micronucleus. Description relies on single record by Ghosh (1928) India.
Quote; Colin R. Curds "British and other freshwater ciliated protozoa Part I Ciliophora: Kinetofragminophora" Cambridge University Press, 1982 (ref. ID; 2013)