Omar Atef, Moon Ji Hye, Nam Seung Won, Jung Jae-Ho
Natural Science Research Institute, Gangneung-Wonju National University, Gangneung, South Korea.
Department of Zoology, Al Azhar University, Assiut, Egypt.
Front Microbiol. 2021 Jul 5;12:691361. doi: 10.3389/fmicb.2021.691361. eCollection 2021.
n. sp. was discovered in a hypersaline marine sample from Jeju Island, Korea. It is characterized by the highly reduced number of dorsal bristles. In addition, the main character of the genus (e.g., alveolar layer) is absent/indistinct. To figure out its identity and phylogenetic relationship, we examined the new species based on modern morphological methods and molecular phylogenetic analyses. Since the parabirojimids are of basal position to core hypotrichs and a smaller data set could show incorrect phylogenetic relationships among the hypotrichs, we used a huge data set composed of 1,460 DNA sequences to infer the phylogenetic tree. The reduction of dorsal bristles is very likely a secondarily evolved character in hypotrichs, resulting in the independent phenotypic adaptation in the hypersaline ecosystems as shown in other hypersaline hypotrichs. Furthermore, the so-called right marginal row 1 in other congeners is found to produce a pretransverse and transverse cirrus and thus we recommend using the term frontoventral row. Based on our data, we can justify n. sp. as a new species; however, despite the phenotypic distinctiveness, we refrain to establish a new genus because of the missing data and the non-monophyly of .
新物种是在韩国济州岛的一个高盐度海洋样本中发现的。其特征是背刚毛数量大幅减少。此外，该属的主要特征（如泡状层）不存在/不明显。为了确定其身份和系统发育关系，我们基于现代形态学方法和分子系统发育分析对该新物种进行了研究。由于副双棘虫类处于核心下毛目基部位置，较小的数据集可能会显示下毛目之间错误的系统发育关系，因此我们使用了由1460个DNA序列组成的庞大数据集来推断系统发育树。背刚毛的减少很可能是下毛目次生演化出的特征，导致其在高盐生态系统中出现独立的表型适应，就像其他高盐下毛目一样。此外，在其他同属物种中所谓的右缘列1被发现会产生前横触毛和横触毛，因此我们建议使用额腹列这一术语。基于我们的数据，我们可以认定该新物种；然而，尽管其表型独特，但由于数据缺失以及该属的非单系性，我们 refrain to establish a new genus（此处英文原文有误，根据前文推测可能是“ refrain from establishing a new genus”，即“ refrain from”意为“避免，克制”，整句意思是“克制建立一个新属”）。
