硅藻中国新记录种——比提基金长篦藻

Neidium beatyi Hamilton et al.,a New Diatom Record from China

该研究利用光学和扫描电子显微镜对采自湖南东洞庭湖国家级自然保护区的硅藻标本进行了观察,鉴定出其中一种硅藻为比提基金长篦藻(Neidium beatyi Hamilton et al.)。结果表明,该长篦藻具有以下鉴定特征:(1)线性椭圆至线性披针形的壳瓣外形。(2)壳面两侧具有3~5条纵向线。(3)向相反方向弯曲的两近缝端,呈叉状分枝的远缝端末梢及顶端的三角形硅质顶盖。(4)16~18条/10μm的线纹密度和14~18个/10μm的孔纹密度。(5)一些孔纹内部开口周围的4~7个豆状突出物。本研究结果与比提基金长篦藻模式种群的形态特征和数量性状均吻合,故确定其为比提基金长篦藻;增加了比提基金长篦藻的新地理分布区域——中国洞庭湖。

This study identifies one diatom species as Neidium beatyi after examining the specimens collected from East Dongting Lake National Nature Reserve by using light and scanning electric microscopy.The observation results demonstrate that N.beatyi possesses the following diagnostic features:(1)linear-elliptic to-lanceolate valve outline;(2)3-5 longitudinal lines along two valve margins;(3)Two proximal raphe ends deflected in opposite directions,distal raphe ends forming forked two fissures and triangular apical flap present at each apex;(4)Striae 16-18/10μm and areolae 14-18/10μm;(5)4-7 renilimbi surrounded each internal opening of some areolae.The study results are consistent with the morphological characteristics and quantitative characters of the type population of N.beatyi,hence it is confirmed to be N.beatyi;and add a new geographical distribution region of N.beatyi—Dongting Lake,China.