Morphology and molecular phylogeny of the anaerobic freshwater ciliate Urostomides spinosus nov. spec. (Ciliophora, Armophorea, Metopida) from China.
2021
The morphology and molecular phylogeny of a new metopid ciliate, Urostomides spinosus nov. spec., discovered in a freshwater ditch in Qingdao, China, were investigated using live observation, morphometry and protargol staining as well as molecular phylogenetic methods. Diagnostic features of the new species include a broadly obpyriform body carrying three posterior spines, eight somatic kineties, five preoral dome kineties with specialized row 3, adoral zone composed of about 28 membranelles, making a 270° turn around body axis. Phylogenetic analyses of the SSU rDNA sequence revealed that the genus Urostomides is monophyletic, but its interspecific relationships remained unresolved. Moreover, a closer relationship of the new species with the morphologically similar Urostomides campanula was not supported by the molecular data.
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