This paper is a critical revision of the protozoan genera Thuricola and Psendothuricola (Ciliata, Peritrichia, Vaginicolidae). Thuricola Kent, 1881, is considered to include the nominal genus Thuricolopsis Stokes, 1887, but it is kept apart from Pseudothuricola Kahl, 1935. An annotated list of the hitherto described nominal species is given. Eleven species are recognized within the genus. A short description of each of these and a key to their identification are given. All recognized species are figured; some illustrations from the literature have been redrawn and brought together to facilitate comparison among them and to justify the taxonomical decisions which have been taken.