Gollner Sabine, Ivanenko Viatcheslav N, Arbizu Pedro Martinez
Department of Marine Biology, University of Vienna, Althanstr. 14, 1090 Vienna, Austria;
Zootaxa. 2008 Sep 3;1866:323-336.
Both male and female of the new deep-sea species Smacigastes barti sp. nov. (Tegastidae, Sars) are described in detail. Copepoda is one of the most diversified taxa at deep-sea hydrothermal vents, but only one species of the family Tegastidae has been described from this habitat and other deep-sea environments. Smacigastes barti is the second species of the genus SmacigastesIvanenko & Defaye, 2004, and was found in artificial substrates deployed in the vicinity of and 0.5 m from tubeworm aggregations at the 9°50'N region on the East Pacific Rise at 2500 meters depth. The derived character states of the new species are the lack of coxal endites on the maxilla, and 2-segmented exopods of swimming legs 2 and 3, the latter being the result of the fusion of the 2 proximal segments. An identification key to all known genera of Tegastidae is provided. Interestingly, the distribution of S. barti showed that it does not tolerate elevated temperatures and/or the presence of hydrogen sulfide or oxygen fluctuations, although both species of this genus were found in deep-sea chemosynthetic environments.
对新的深海物种巴氏斯马吉哲水蚤（学名：Smacigastes barti sp. nov.）（属于哲水蚤科，萨斯哲水蚤属）的雄性和雌性个体均进行了详细描述。桡足类是深海热液喷口处最多样化的分类群之一，但仅有一种哲水蚤科物种是从该栖息地及其他深海环境中被描述的。巴氏斯马吉哲水蚤是斯马吉哲水蚤属（伊万年科和德法耶，2004年）中的第二个物种，它是在东太平洋海隆北纬9°50′区域2500米深处，部署在靠近管虫聚集区且距离其0.5米处的人工基质上发现的。新物种的衍生特征是上颌骨上没有基节内叶，以及游泳足2和3的外肢分两节，后者是由近端两节融合而成的。提供了哲水蚤科所有已知属的检索表。有趣的是，巴氏斯马吉哲水蚤的分布表明，尽管该属的两个物种都发现于深海化学合成环境中，但它无法耐受温度升高和/或硫化氢的存在或氧气波动。
