摘要
研究利用光学和扫描电子显微镜对采自湖南省江华瑶族自治县一源头水溪流的硅藻标本进行观察,鉴定出中国新记录种——沃氏具脊桥弯藻(Oricymba voronkinae Glushchenko,Kulikovskiy&Kociolek)。研究结果显示该具脊桥弯藻具有以下鉴别特征,(1)壳面呈披针形,末端钝圆;(2)壳面平坦,壳面和壳套区别明显,被1条边缘脊分开;(3)边缘脊两侧具凹槽;(4)近缝端向壳面腹侧偏转,远缝端几乎呈直角向壳面背侧弯曲,且在远缝末梢的背侧处有1个缺刻;(5)壳面中央孤点外侧开口为1个简单圆形,内壳面开口为被向内生长物所遮挡的2个裂缝;(6)壳面孔纹呈裂缝状,仅近中轴区的孔纹呈半圆至弧形,孔纹的开口被齿状突出物部分遮挡;(7)顶孔区内侧开口被波浪形的贯壳列硅质条所覆盖,但未完全封闭内侧开口;(8)壳面中部的线纹密度为8~11条/(10μm),孔纹密度25~30个/(10μm)。文章提供了沃氏具脊桥弯藻孔纹密度和原始描述中未揭示的顶孔区内壳面的详细超微结构特征。
The authors identified a newly reported diatom species as Oricymba voronkinae Glushchenko,Kulikovskiy&Kociolek from China,after examining the specimens collected from a headwater stream,which ran through the Jianghua Yao Autonomous County of Hunan province,by using light and scanning electron microscopy.The observation results demonstrated that O.voronkinae had the following diagnostic characteristics,(1)lanceolate valve outline with bluntly rounded ends.(2)Valve face flat and clearly separated from the mantle by a marginal ridge.(3)Grooves presented along both sides of the marginal ridge.(4)The proximal raphe endings deflexed to ventral side,and the distal raphe endings bended to dorsal side at near a right angle,and a notch on the dorsal side of distal raphe fissure.(5)Central stigma externally had single round opening,but internally had two slit-like openings occluded by fine ingrowths.(6)Areolae were elongated slits,only the areolae near central axial area were semicircular to arcuate,partially occluded by dentate projections.(7)The undulate flap-like silica strips covering the internal apertures of each pervalvar row of foramina,not completely occluding internal apertures.(8)Stria density 811/(10μm)measured at the central valve part,areola density 2530/(10μm).This study provided the accurate data of the areolae density and the detailed internal ultrastructure of the apical pore fields,which was not revealed in its original descriptions for O.voronkinae.
作者
郑妍
刘冰
易曼琪
杨彬
徐子林
ZHENG Yan;LIU Bing;YI Manqi;YANG Bin;XU Zilin(College of Biology and Environmental Sciences,Jishou University,Jishou,Hunan 416000,China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2023年第11期1975-1980,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
湖南省自然科学基金面上项目(2022JJ30473)
吉首大学-中国科学院沈阳应用生态研究所会同森林生态站生物类专业校企合作创新创业教育基地资助项目。
作者简介
郑妍(1999-),女,硕士研究生,主要从事硅藻分类和生态研究。E-mail:zhengyan1016@163.com;通信作者:刘冰,男,副教授,主要从事硅藻分类和生态研究。E-mail:jsulb@outlook.com。
