Lee Eun Sun, Kim Young-Ok, Agatha Sabine, Jung Jae-Ho, Xu Dapeng, Shin Mann Kyoon
South Sea Environment Research Division, Korea Institute of Ocean Science & Technology (KIOST), Geoje, 656-834, Korea; Department of Biological Science, College of Natural Sciences, University of Ulsan, Ulsan, 680-749, Korea.
J Eukaryot Microbiol. 2015 May-Jun;62(3):400-9. doi: 10.1111/jeu.12195. Epub 2014 Dec 11.
This study analyses the morphological characters of Strombidium paracalkinsi, a species bearing thigmotactic membranelles, collected from Jangmok Bay at the southern coast of Korea. The small subunit ribosomal RNA gene of S. paracalkinsi was sequenced for the first time. By a combination of characters, the thigmotactic membranelles of S. paracalkinsi differ from the thigmotactic membranelles of other strombidiids. They are (1) positioned on dorsal side, (2) contiguous with three membranelles of the adoral zone, but separated by nonciliated portions of the polykinetids, and (3) composed of two rows of kinetids. Except for the thigmotactic membranelles, the morphology of S. paracalkinsi conforms to the diagnosis of the genus Strombidium. Our phylogenetic tree confirms the nonmonophyly of the genus Strombidium. The thigmotactic membranelles are a promising feature for a future split of the genus Strombidium, but require further studies, especially on Strombidium calkinsi Fauré-Fremiet 1932.
本研究分析了从韩国南部海岸长木湾采集的具有趋触性小膜口缘区的副卡尔金氏钟虫（Strombidium paracalkinsi）的形态特征。首次对副卡尔金氏钟虫的小亚基核糖体RNA基因进行了测序。综合各项特征，副卡尔金氏钟虫的趋触性小膜口缘区与其他钟虫科物种的趋触性小膜口缘区不同。它们具有以下特点：（1）位于背面；（2）与口前区的三个小膜口缘区相邻，但被多动基体的无纤毛部分隔开；（3）由两排动基体组成。除趋触性小膜口缘区外，副卡尔金氏钟虫的形态符合钟虫属的诊断。我们的系统发育树证实了钟虫属的非单系性。趋触性小膜口缘区是钟虫属未来可能分裂的一个有前景的特征，但还需要进一步研究，特别是对1932年法雷 - 弗雷米埃描述的卡尔金氏钟虫（Strombidium calkinsi）的研究。
