In the last two decades, cyrtophorian ciliates have been revealed to demonstrate a high species diversity. But this group remains difficult to study, mainly because of their low abundance and relatively few taxonomically informative morphological characters. As a contribution to the taxonomy of cyrtophorians, here we investigate three Dysteria species based on their live morphology, ciliary pattern, and molecular phylogeny. Dysteria ozakii nom. nov. can be recognized by its elongate body shape and four right kineties, including three frontoventral kineties. A neotype has to be fixed for the species as no type materials were deposited. The other two species, D. brasiliensis Faria et al., 1922 and D. compressa (Gourret & Roeser, 1886) Kahl, 1931, are redescribed and supplementary information for each is supplied. Phylogenetic analyses based on small-subunit (SSU) rRNA gene sequences support the validity of the species. In addition, four species of bacterial epibionts were observed on the surface of the three Dysteria spp. The identities of these bacterial species are discussed based on the newly obtained 16S rRNA gene sequences.

在过去的二十年中，已发现cyrtophorian 纤毛虫表现出高度的物种多样性。但该组仍然难以研究，主要是因为它们的丰度低且分类学信息形态特征相对较少。作为对 cyrtophorians 分类学的贡献，我们在这里根据它们的活形态、纤毛模式和分子系统发育研究了三种Dysteria物种。Dysteria ozakii nom. 十一月 可以通过其细长的身体形状和四个右侧动能来识别，其中包括三个前腹侧动能。由于没有沉积类型材料，因此必须为该物种固定一个新类型。其他两个物种，D. brasiliensis Faria et al., 1922 和D. compressa(Gourret & Roeser, 1886) Kahl, 1931 被重新描述，并提供了每一个的补充信息。基于小亚基 (SSU) rRNA 基因序列的系统发育分析支持该物种的有效性。此外，在三种Dysteria spp 的表面上观察到了四种细菌表层。基于新获得的 16S rRNA 基因序列讨论了这些细菌物种的身份。