摘要
为揭示拟瑞士桥弯藻的超微形态结构特征,利用扫描电子显微镜对拟瑞士桥弯藻进行了全面观察.结果表明该桥弯藻具有6个鉴定特征.(1)壳瓣具明显背腹之分;(2)远端壳缝末梢弯向背侧,近缝端膨大呈泪珠状,不偏转;(3)无顶孔区;(4)单列线纹,略微辐射状排列,但在两端转为会聚状,背侧线纹密度为9~11条/10μm,腹侧为11~13条/10μm;(5)孔纹通常呈狭缝隙状,个别呈“Y”形,密度为30~33个/10μm;(6)腹侧中央有4~7个孤点.以上特征组成了区分和鉴定拟瑞士桥弯藻的独特性状组合.
To reveal the ultrastructural features of Cymbella subhelvetica Krammer, this study carries out a thorough observation using scanning electron microscope.The observational results demonstrate that C. subhelveticapossesses the following diagnostic features:(1)valves distinctly dorsiventral;(2)distal raphe fissure curved dorsally, proximal raphe ends teardrop not deflected;(3)no apical pore fields;(4)striae uniseriate, slightly radiate except closing to each apex where becoming convergent dorsal striae 9~11/10 μm, ventral striae 9~13/10 μm;(5) Areolae mostly lineate, occasionally Y-shaped, and areolae 30~33/10 μm;(6) 4~7 stigmata.Above characteristics together constitute a unique combination of features that distinguish and identify C. subhelvetica.
作者
龙继艳
刘冰
徐三妹
唐海朋
LONG Jiyan;LIU Bing;XU Sanmei;TANG Haipeng(College of Biology and Environmental Sciences,Jishou University,Jishou 416000,Hunan China;School of Arts and Science,Huaihua Normal College,Huaihua 418000,Hunan China)
出处
《吉首大学学报（自然科学版）》
CAS
2022年第4期67-71,共5页
Journal of Jishou University(Natural Sciences Edition)
基金
湖南省自然科学基金资助项目(2022JJ30473)
湖南省研究生科研创新项目(CX20211072)。
关键词
超微结构
拟瑞士桥弯藻
孤点
顶孔区
青海
ultrastructure
Cymbella subhelvetica Krammer
stigmata
apical pore fields
Qinghai
