Abstract
The genera Colpidium Stein, 1860 and Dexiostoma Jankowski, 1967 are revised. Our monographic treatment is based on a morphologic and biometric reinvestigation of the main species of these genera and on an evaluation of data from the literature. Colpidium comprises four species, namely C. colpoda (Losana, 1829), C. singulare Vuxanovici, 1961, C. acuminatum Vuxanovici, 1962, and C. kleini Foissner, 1969. The monotypic genus Dexiostoma contains D. campyla (Stokes, 1886) and is distinguished from Colpidium by a different oral infraciliature and the position and shape of the preoral suture. A new genus, Paracolpidium nov. gen., is suggested for Colpidium truncatum Stokes, 1885 because its oral infraciliature deviates from both Colpidium and Dexiostoma. Contrary to Colpidium and Dexiostoma, the silverline system of Paracolpidium truncatum lacks secondary meridians but shows short projections to the left of the primary meridians indicating a phylogenetic relationship to Tetrahymena.
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