Table 6 in Description of two new species of Desmoscolex Claparède, 1863 (Nematoda: Desmoscolecidae) from the Cassidaigne Canyon, Mediterranean Sea

Table 6 (continued on next page). Comparative characteristics of Desmoscolex (Desmoscolex) Claparède, 1863 species lacking cephalic setae, from Jung et al. 2024, with the inclusion of Desmoscolex (Desmoscolex) nibelungus sp. nov. Abbreviations: M = male; F = female; – = unknown; Sd = subdorsal setae; Sv = subventral setae. characterstaxabody length (µm)number of main ringsetae arrangementheadamphidsubdorsal setaesubventral setaehabitatlocalityD. (D.) asetosus Decraemer, 1975M: 225–250 F: 275, 32017Sd: ♂, ♀ (1,3,5,7,9,11,13,16,17) Sv: ♂, ♀ (2,4,6,8,10,12,14,15)asymmetrical, bent to the dorsal sidebipartite, extends to second main ringwide base with a bent lance-shaped tipwide base with a sharp, short tipsandy bottom with layer of silt and abundant foraminifera, 21.5 mLizard Island, Great Barrier Reef, AustraliaD. (D.) lanceosetatus Jug, Kihm & Rho, 2024M: 295–440 F: 250–31017Sd: ♂, ♀ (1,3,5,7,9,11,13,16,17) Sv: ♂ (2,4,6,8,10,12,14,15), (2,4,6,8,10,12,15)asymmetrical, bent to the dorsal sidevesicular, extends to the posterior margin of the first main ringwide base with lance-shaped tipnormal bristle structure with an open tipsilty sand, 48 m, 103 mJeju Island, KoreaD. (D.) nibelungus sp. nov.M: 267–310 F: 249–30917Sd: ♂, ♀ (1,3,5,7,9,11,13,16,17) Sv: ♂, ♀ (2,4,6,8,10,12,14,15)globular, with protruding and uncovered lip regioncircular, nearly covers all the lateral head regionthick, with a cylindrical base and tapering towards the distal end. Last pair with wiry appearancethick, with a cylindrical base and tapering towards the distal enddeep sea, 605 m, 1056 mCassidaigne Canyon, FranceD. (D.) obscurus Bussau, 1993M: 365 F: 44517Sd: ♂, ♀ (1,3,5,7,9,11,13,16,17) Sv: ♂ (2,4,6,8,10,12,14,15), ♀ (2,4,6,8,10,12,15)–vesicular, slightly beyond first main ringlance-shaped tipnormal bristle structuredeep sea, 4154 m, 4174 mPeru Basintaxabody length (µm)number of main ringsetae arrangementheadamphidsubdorsal setaesubventral setaehabitatlocalityD. (D.) rostratus Timm, 1970F: 33031Sd: ♀ (1,4,7,11,15,19,23,29,31) Sv: ♀ (2,5,9,13,17,21,27)asymmetrical with a long snoutovate, extending to first main ringinconspicuous lancet tip, single terminal subdorsal setae–rock dredge, 73 mIndian OceanD. (D.) rotundicephalus Jug, Kihm & Rho, 2024M: 275 F: 255–32017Sd: ♂, ♀ (1,3,5,7,9,11,13,16,17) Sv: ♂ (2,4,6,8,10,12,14,15), ♀ (2,4,6,8,10,12,15)globular head with a protruding labial regionoval, covering most of the head with central amphidial poretapering to an open tip without lance-shaped tipnormal fine structuresilty sand, 103 mJeju Island, Korea表6（续见下页）：1863年Claparède建立的链环线虫属（Desmoscolex）无头部刚毛物种的比较特征，数据源自Jung等人2024年的研究，本表格新增了Desmoscolex (Desmoscolex) nibelungus新种（sp. nov.）。缩写说明：M = 雄性（male），F = 雌性（female），– = 未知，Sd = 背侧亚刚毛（subdorsal setae），Sv = 腹侧亚刚毛（subventral setae）。1. 无刚毛链环线虫（Desmoscolex (Desmoscolex) asetosus）Decraemer, 1975：雄性虫体长度225–250 μm，雌性为275、320 μm；主环数17；背侧亚刚毛：雌雄个体均为(1,3,5,7,9,11,13,16,17)；腹侧亚刚毛：雌雄个体均为(2,4,6,8,10,12,14,15)；头部呈不对称形，向背侧弯曲；头侧感器（amphid）为双叶状，延伸至第2主环；背侧亚刚毛基部宽阔，顶端呈弯曲矛形；腹侧亚刚毛基部宽阔，顶端尖锐且短小；栖息环境为含粉砂层与大量有孔虫的砂质底质，水深21.5 m；采集地：澳大利亚大堡礁蜥蜴岛。2. 矛状亚刚毛链环线虫（Desmoscolex (Desmoscolex) lanceosetatus）Jug, Kihm & Rho, 2024：雄性虫体长度295–440 μm，雌性为250–310 μm；主环数17；背侧亚刚毛：雌雄个体均为(1,3,5,7,9,11,13,16,17)；腹侧亚刚毛：雄性为(2,4,6,8,10,12,14,15)，雌性为(2,4,6,8,10,12,15)；头部呈不对称形，向背侧弯曲；头侧感器为囊泡状，延伸至第1主环后缘；背侧亚刚毛基部宽阔，顶端呈矛形；腹侧亚刚毛为正常刚毛结构，顶端开放；栖息环境为粉砂质砂，水深48 m、103 m；采集地：韩国济州岛。3. 尼伯龙根链环线虫新种（Desmoscolex (Desmoscolex) nibelungus sp. nov.）：雄性虫体长度267–310 μm，雌性为249–309 μm；主环数17；背侧亚刚毛：雌雄个体均为(1,3,5,7,9,11,13,16,17)；腹侧亚刚毛：雌雄个体均为(2,4,6,8,10,12,14,15)；头部呈球形，唇区突出且裸露；头侧感器为圆形，几乎覆盖全部头部侧区；背侧亚刚毛粗壮，基部呈圆柱形，向远端逐渐变细，最后一对刚毛呈丝状；腹侧亚刚毛粗壮，基部呈圆柱形，向远端逐渐变细；栖息环境为深海，水深605 m、1056 m；采集地：法国卡斯蒂格尼峡谷（Cassidaigne Canyon）。4. 暗色链环线虫（Desmoscolex (Desmoscolex) obscurus）Bussau, 1993：雄性虫体长度365 μm，雌性为445 μm；主环数17；背侧亚刚毛：雌雄个体均为(1,3,5,7,9,11,13,16,17)；腹侧亚刚毛：雄性为(2,4,6,8,10,12,14,15)，雌性为(2,4,6,8,10,12,15)；头部形态未知；头侧感器为囊泡状，略延伸至第1主环后方；背侧亚刚毛顶端呈矛形；腹侧亚刚毛为正常刚毛结构；栖息环境为深海，水深4154 m、4174 m；采集地：秘鲁海盆。5. 喙状链环线虫（Desmoscolex (Desmoscolex) rostratus）Timm, 1970：仅记录雌性个体，虫体长度330 μm；主环数31；背侧亚刚毛：雌性个体为(1,4,7,11,15,19,23,29,31)；腹侧亚刚毛：雌性个体为(2,5,9,13,17,21,27)；头部呈不对称形，具长吻突；头侧感器为卵形，延伸至第1主环；背侧亚刚毛顶端呈不明显的矛形，具1根端生背侧亚刚毛；腹侧亚刚毛信息未知；栖息环境为岩石拖网采样，水深73 m；采集地：印度洋。6. 圆头链环线虫（Desmoscolex (Desmoscolex) rotundicephalus）Jug, Kihm & Rho, 2024：雄性虫体长度275 μm，雌性为255–320 μm；主环数17；背侧亚刚毛：雌雄个体均为(1,3,5,7,9,11,13,16,17)；腹侧亚刚毛：雄性为(2,4,6,8,10,12,14,15)，雌性为(2,4,6,8,10,12,15)；头部呈球形，唇区突出；头侧感器为卵形，覆盖大部分头部，具中央头侧感器孔；背侧亚刚毛逐渐变细，顶端开放，无矛形尖端；腹侧亚刚毛结构正常纤细；栖息环境为粉砂质砂，水深103 m；采集地：韩国济州岛。