Fu Sujing, Mou Jianfeng, Liu Kun, Zhang Shuyi, Lin Heshan
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China Third Institute of Oceanography, Ministry of Natural Resources Xiamen China.
Zookeys. 2025 Jul 8;1244:121-145. doi: 10.3897/zookeys.1244.135491. eCollection 2025.
Two new marine nematode species of the genus and a new record of Chen & Vincx, 1998 belonging to the family Comesomatidae are described from the Southern Ocean using morphological and molecular data. is characterized by body length 1786-2230 μm, short cephalic setae, lateral differentiation of body cuticle with sparse punctations starting from amphid to near tail tip, spiral amphidial fovea with three turns, spicules arcuate and 1.2-1.5 cloacal body diameters long, with straight dorso-caudal gubernacular apophyses, and 16 or 17 precloacal supplements. is characterized by body length 2628-3613 μm, short cephalic setae, cuticle with lateral differentiation of coarser and irregularly spaced punctations extending from anterior edge of amphid to the tail region, amphidial fovea spiral with 2.5 turns, males with spicules 1.2-1.5 cloacal body diameters long, gubernaculum with a long straight dorso-caudal apophysis, and 20 or 21 fine precloacal supplements. , which was originally described from the Strait of Magellan and the Beagle Channel, is recorded from the Southern Ocean for the first time. Phylogenetic analysis based on concatenated 18S + 28S rRNA sequences places the two new species and the new record within Comesomatidae. The tree topology shows Comesomatidae forming a well-supported monophyletic clade, whereas the genus is not monophyletic.
利用形态学和分子数据，从南大洋描述了科梅索马线虫属（Comesoma）的两个海洋新线虫物种以及属于科梅索马科（Comesomatidae）的1998年陈 & 温克斯（Chen & Vincx）记录的一个新记录种。新物种A的特征为体长1786 - 2230μm，头部刚毛短，体表角质层从双环感觉器到近尾尖有稀疏小孔的侧向分化，双环感觉器螺旋形有三圈，交合刺弓形，长为泄殖腔体直径的1.2 - 1.5倍，背尾导刺突直，有16或17个泄殖腔前补充器。新物种B的特征为体长2628 - 3613μm，头部刚毛短，角质层有从双环感觉器前缘延伸至尾部区域的较粗且间距不规则的小孔的侧向分化，双环感觉器螺旋形有2.5圈，雄性交合刺长为泄殖腔体直径的1.2 - 1.5倍，导刺带有长的直的背尾突，有20或21个细小的泄殖腔前补充器。最初从麦哲伦海峡和比格尔海峡描述的物种C，首次在南大洋被记录。基于串联的18S + 28S rRNA序列的系统发育分析将这两个新物种和新记录种置于科梅索马科内。树形拓扑结构显示科梅索马科形成一个得到充分支持的单系类群，而科梅索马属不是单系的。
