%0 Journal Article %A Miao, Miao %A Wang, Yangang %A Song, Weibo %A Clamp, John C. %A Al-Rasheid, Khaled A. S. %T Description of Eurystomatella sinica n. gen., n. sp., with establishment of a new family Eurystomatellidae n. fam. (Protista, Ciliophora, Scuticociliatia) and analyses of its phylogeny inferred from sequences of the small-subunit rRNA gene %D 2010 %J International Journal of Systematic and Evolutionary Microbiology, %V 60 %N 2 %P 460-468 %@ 1466-5034 %R https://doi.org/10.1099/ijs.0.009621-0 %K SSU, small subunit %K PM, paroral membrane %K NJ, neighbour-joining %K MP, maximum-parsimony %K BI, Bayesian inference %I Microbiology Society, %X Recently, an undescribed marine ciliate was isolated from China. Investigation of its morphology and infraciliature revealed it as an undescribed species representing a new genus, Eurystomatella n. gen., the type of the new family Eurystomatellidae n. fam. The new family is defined by close-set, apically positioned oral membranelles and a dominant buccal field that is surrounded by an almost completely circular paroral membrane. The new genus is defined by having a small oral membranelle 1 (M1), bipartite M2 and well-developed M3, a body surface faintly sculptured with a silverline system in a quadrangular, reticulate pattern and a cytostome located at the anterior third of a large buccal field. The type species of the new genus, Eurystomatella sinica n. sp., is a morphologically unique form that is defined mainly by the combination of a conspicuously flattened body, several caudal cilia, extremely long cilia associated with the buccal apparatus and a contractile vacuole located subcaudally. According to phylogenetic analyses of small-subunit (SSU) rRNA gene sequences, Eurystomatella clusters with the genus Cyclidium, as a sister group to the family Pleuronematidae. The great divergence in both buccal and somatic ciliature between Eurystomatella and all other known scuticociliates supports the establishment of a new family for Eurystomatella. %U https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijs.0.009621-0