Choi Ji Hye, Omar Atef, Kim Min-Seop, Jung Jae-Ho
Department of Biology, Gangneung-Wonju National University, Gangneung 25457, South Korea.
Industry Academy Cooperation Group, Gangneung-Wonju National University, Gangneung 25457, South Korea.
Eur J Protistol. 2022 Oct;86:125937. doi: 10.1016/j.ejop.2022.125937. Epub 2022 Oct 28.
A new marine ciliate was discovered from intertidal mudflat from South Korea. Based on the observation of living cells, protargol-impregnated specimens and SEM, we describe it as new species belonging to the genus Diophrys Dujardin, 1841, namely Diophrys pauciciliata n. sp. Its nuclear small subunit ribosomal RNA gene also supports the taxonomic assignment. Diophrys pauciciliata n. sp. is one of the smallest species in the genus. Besides, the bipartite adoral zone and oligomerized dorsal bristles easily discriminate the new species from other congeners. Interestingly, D. pauciciliata n. sp. showed highly static states in all morphometrics (<8.5 % of coefficient of variation) and in particular, the number of frontal adoral membranelles and the counts of dorsal ciliature (e.g., number of dorsal kineties and numbers of dikinetids within each kinety) are invariable. Considering morphometric data of previous studies in the genus Diophrys, the narrow range of character states is unexpected because cell length is usually positively correlated with the numbers of adoral membranelles and dorsal dikinetids.
在韩国潮间带泥滩发现了一种新的海洋纤毛虫。基于对活细胞、经普罗他戈染色的标本和扫描电子显微镜的观察，我们将其描述为1841年杜雅尔丹所建立的Diophrys属的一个新物种，即少纤Diophrys（Diophrys pauciciliata）新种。其核糖体小亚基RNA基因也支持这一分类归属。少纤Diophrys新种是该属中最小的物种之一。此外，二分口前区和寡聚化的背刚毛很容易将该新物种与其他同属物种区分开来。有趣的是，少纤Diophrys新种在所有形态测量指标上都表现出高度的稳定性（变异系数<8.5%），特别是额口膜的数量和背纤毛的数量（如背动基列的数量以及每个动基列内双动粒的数量）是不变的。考虑到之前对Diophrys属的研究中的形态测量数据，性状状态范围狭窄是出乎意料的，因为细胞长度通常与口膜和背双动粒的数量呈正相关。
