• Korean Journal of Ecology and Environment
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• v.42 no.2
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• pp.253-259
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• 2009

We investigated annual and seasonal changes of Keratella spp. among rotifer community in the lower part of the Nakdong River (Mulgum) for four years (1995, 1997, 2005, 2007). As well, the annual and seasonal variations of lorica morphologies including sizes, posterior and anterior spines lengths in K. cochlearis were analyzed. The density of Keratella spp. showed distinct seasonality such as spring peak and winter scarcity. K. cochlearis was the most dominant species within Keratella spp. and the relative abundances of 2005 and 2007 were higher than 1995 and 1997. The lorica length and width of K. cochlearis did not show the annual changes between four years however, there was an obvious width decrease in summer and increase in winter. The proportion of individuals that has the posterior spine was relatively low throughout four years, especially at summer and autumn. K. cochlearis displayed short posterior spine in summer and long posterior spine in winter contrary to the anterior median and intermediate spines.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.26 no.3
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• pp.248-262
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• 2021

Marine planktonic ciliates include two major groups, loricated tintinnids and naked oligotrichs. The study of marine ciliate plankton in Korea began with taxonomic efforts on tintinnids based on the morphology of lorica, a vase-shaped shell. Despite polymorphism in the lorica, it is utilized as a key characteristic in identification of tintinnid species. However, oligotrichs have been studied only recently in Korea due to challenges associated with the observation of ciliary arrangements and the technical development for cell staining. Species diversity and phylogenetic classification of the ciliates have been informed by recent advances in morphological and molecular analyses. Illustrations of the planktonic ciliate in Korea have been published on the basis of taxonomic data of tintinnids and oligotrichs. Planktonic ciliates acting as the major consumers of pico- and nanoplankton as well as the prey of mesozooplankton, has been monitored by spatial and temporal investigations in Korean coastal waters. A practical approach addressing the limitations and potential of marine ciliate studies in Korea is proposed here to improve the data quality of planktonic ciliates, providing an enhanced basis for quality control of ciliate monitoring.

• Animal Systematics, Evolution and Diversity
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• v.40 no.1
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• pp.1-15
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• 2024

Our study aimed to investigate the diversity of tintinnid species in Korea by collecting samples from coastal waters. As a result, we identified and redescribed three newly recorded species of the genus Tintinnopsis Stein, 1867 and one previously recorded species of the genus Antetintinnopsis Wang et al., 2021 in Korea. The loricae morphology and molecular phylogeny based on the 18S rDNA sequences of these four were analyzed. Tintinnopsis kiaochowensis Yin, 1956 is characterized by having an irregular collar with spiral turns and an obconical-shaped bowl. Tintinnopsis orientalis Kofoid and Campbell, 1929 is characterized by the inverted bell-shaped lorica with size of 121-140×86-94 ㎛. Tintinnopsis parvula Jörgensen, 1912 is characterized by its narrower collar than bowl and acute angle of the bowl (39-75°). The recorded species, Antetintinnopsis gracilis (Kofoid and Campbell, 1929) Wang et al., 2021 is characterized by a cylindrical collar narrower than the bowl width and with a size of 98-131×37-46 ㎛.