Journal of Jishou University(Natural Sciences Edition) ›› 2022, Vol. 43 ›› Issue (4): 67-71.DOI: 10.13438/j.cnki.jdzk.2022.04.012

• Biology and chemical industry • Previous Articles     Next Articles

Ultrastructure of Cymbella subhelvetica Krammer

LONG Jiyan,LIU Bing,XU Sanmei,TANG Haipeng   

  1. (1.College of Biology and Environmental Sciences,Jishou University,Jishou 416000,Hunan China;2.School of Arts and Science,Huaihua Normal College,Huaihua 418000,Hunan China)
  • Online:2022-07-25 Published:2022-10-28

Abstract: 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.

Key words: ultrastructure, Cymbella subhelvetica Krammer, stigmata, apical pore fields, Qinghai

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