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Hypotrich ciliates with evolutionary novelties are continually being discovered, challenging the current taxonomic system and attracting increased attention. In the present work, two new urostylid ciliates,  Heterobakuella bergeri  gen. nov., sp. nov. and  Anteholosticha perezuzae  sp. nov., isolated from Chinese wetland samples, were identified based on morphology and 18S rRNA gene sequences.  Heterobakuella  gen. nov. is defined by three frontal cirri, single buccal cirrus, one parabuccal cirrus, midventral complex composed of cirral pairs and one cirral row, one left and two right marginal cirral rows, transverse and pretransverse cirri present, caudal and frontoterminal cirri absent.  Heterobakuella  can be easily distinguished from the morphologically most similar genus,  Apobakuella , mainly by the single buccal cirrus (vs. one buccal cirral row) and one parabuccal cirrus (vs. several parabuccal cirral rows originated from different anlagen). Phylogenetic analyses show that  H. bergeri  branches within the clade formed by  Bergeriella ovata ,  Monocoronella carnea ,  Anteholosticha gracilis , and  Neourostylopsis  spp., rather than the clade represented by  Apobakuella . The other species,  A. perezuzae , is mainly characterized by a distinctly slender body shape with an average length:width ratio about 7, distinctively shaped biconcave and greenish cortical granules, as well as one or two pretransverse cirri. Phylogenetic analyses indicate the genus  Anteholosticha  is non-monophyletic.

Taxonomy and Molecular Phylogeny of Two New Urostylid Ciliates (Protozoa: Ciliophora) From Chinese Wetlands and Establishment of a New Genus