In this study, a new "non-oxytrichid Dorsomarginalia" ciliate, Urosomoida sejongensis n. sp. discovered from freshwater of the King George Island, Antarctica, was investigated using morphological, morphometrical, and molecular methods. Morphology of U. sejongensis is characterized as follows: body shape slender to elongated; cortical granules spherical and colorless, groups of granules formed patchy distribution; ring-shaped structures scattered in cytoplasm; 27-30 adoral membranelles with undulating membranes in Oxytricha pattern; usually 17 frontal-ventral-transverse (FVT) cirri composed of 3 frontal, 1 buccal, 4 frontoventral, 3 postoral ventral, 2 pretransverse ventral and 4 transverse cirri; 1 right and 1 left marginal rows; 3 dorsal kineties with 1 dorsomarginal row, 3 caudal cirri; 1 micronucleus between 2 macronuclear nodules. This new species mainly differs from other congeners by the combination of following morphological features: a micronucleus, cortical granules, and ciliatures (e.g., adoral membranelles, FVT cirri). Urosomoida sejongensis shows a nucleotide similarity of 97.3% with U. agilis, type of this genus, using the SSU rDNA sequence. Molecular phylogeny shows a non-monophyletic relationship among Urosomoida species and emphasizes the need for further morphogenetic studies of this genus and other related species to resolve morphological convergences.
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http://dx.doi.org/10.11646/zootaxa.4072.2.7 | DOI Listing |
Eur J Protistol
June 2017
Consulting Engineering Office for Ecology, Radetzkystrasse 10, 5020 Salzburg, Austria. Electronic address:
The morphology, morphogenesis, and SSU rDNA sequence of a Caudiholosticha stueberi population from Southwest China soil were analyzed. The studies confirm the assumption of previous workers that this species has dorsomarginal kineties and thus does not belong to the urostyloids, but to the non-oxytrichid dorsomarginalian genus Uroleptus whose members have, in contrast to C. stueberi, a distinct tail.
View Article and Find Full Text PDFZootaxa
January 2016
Division of Life Sciences, Korea Polar Research Institute, KIOST, 26 Songdomirae-ro, Yeonsu-gu, Incheon 21990, Korea; Email:
In this study, a new "non-oxytrichid Dorsomarginalia" ciliate, Urosomoida sejongensis n. sp. discovered from freshwater of the King George Island, Antarctica, was investigated using morphological, morphometrical, and molecular methods.
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