Xu Yu, Li Yang, Zhan Zifeng, Xu Kuidong
Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China Institute of Oceanology, Chinese Academy of Sciences Qingdao China.
University of Chinese Academy of Sciences, Beijing 100049, China Center for Ocean Mega-Science, Chinese Academy of Sciences Qingdao China.
Zookeys. 2019 Oct 17;881:91-107. doi: 10.3897/zookeys.881.34759. eCollection 2019.
Two new species of Duchassaing & Michelotti, 1864 collected from Kocebu Guyot in the Magellan seamounts of the Pacific Ocean are described and illustrated: collected from a depth of 1831 m and collected from a depth of 1669 m. belongs to the "group A, Spiculosae" with rods distributed in body wall and tentacles, and belongs to the "group C, Squamosae typicae" with rods and/or spindles not present but only scales. differs from congeners by its main stem with 2/5R branching sequence at the bottom forming two large bottlebrush-shaped branches with 1/3R branching sequence at the top. is similar to Bayer & Stefani, 1988, but differs by its larger polyps, larger sclerites in the body wall, and different scales in the upper part of polyps. The mtMutS genetic distances between and and congeners are in the range of 0.33%-2.28% and 0.33%-2.94%, respectively, while the intraspecific distances are in the range of 0-0.16%. Molecular phylogenetic analysis indicates that is clustered with Cairns, 2007 and is clustered with Bayer & Stefani, 1988, both with high support indicating close relationships.
描述并展示了1864年杜沙桑和米凯洛蒂所描述的两个新物种，它们采自太平洋麦哲伦海山的科塞布海丘：一个采自1831米深处，另一个采自1669米深处。第一个物种属于“A组，具针状体”，针状体分布于体壁和触手；第二个物种属于“C组，典型鳞片状”，不存在针状体和/或纺锤体，仅有鳞片。第一个物种与同属其他物种的区别在于其主茎在底部有2/5R分支序列，形成两个大的瓶刷状分支，顶部有1/3R分支序列。第二个物种与1988年的拜耳和斯特凡尼所描述的物种相似，但区别在于其息肉更大、体壁中的骨针更大，以及息肉上部的鳞片不同。第一个物种与同属其他物种以及第二个物种与同属其他物种之间的线粒体MutS基因距离分别在0.33%-2.28%和0.33%-2.94%范围内，而种内距离在0-0.16%范围内。分子系统发育分析表明，第一个物种与2007年的凯恩斯所描述的物种聚类在一起，第二个物种与1988年的拜耳和斯特凡尼所描述的物种聚类在一起，两者都有很高的支持度，表明亲缘关系密切。
