NEWLY RECORDED SPECIES IN CYMBELLACEAE AND GOMPHONEMATACEAE FROM GREAT XING'AN MOUNTAINS,CHINA
NEWLY RECORDED SPECIES IN CYMBELLACEAE AND GOMPHONEMATACEAE FROM GREAT XING'AN MOUNTAINS,CHINA
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DOI：
10.3724/sp.j.1035.2012.00496
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
Liu Yan;F. Yawen;Wang Quan-xi
中科院分区：
文献类型：
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作者：
Liu Yan;F. Yawen;Wang Quan-xi
cyymbellaceae和gonphonemataceae分别由Greville和Kutzing于1833年和1844年建立。但在初步研究中，Smith（1872）将这两个科归入硅藻科，Hustedt（1930）则将其归入Naviculaceae（Gomphocymbelloideae亚科）。直到20世纪60 - 70年代，Patrick Reimer才将这两个科与Naviculaceae等同，属于Biraphidinales。Round等人在1990年根据硅藻瓣的SEM结构，建立了一个新的目——Cymbellales，包括Rhoicospheniaceae、Anomoeoneidaceae、Cymbellaceae和Gomphonemataceae。大花蕙兰科包括：大花蕙兰、大花蕙兰、布氏蕙兰。、库津肺泡菌和穆勒贡松菌。Krammer从cymella中分离出Cymbopleura亚属，Cymbopleura(Krammer) Krammer于1999年建立。Gomphonema Ehrenb。(1)李建平，李建平。(1)属狐蝠科；大兴安岭位于中国东北部，拥有大面积的湿地。在大兴安岭硅藻调查中，蕙兰科和贡松科硅藻偏好pH值为6 ~ 9的生境。结果表明：小兰科植物有5属44个分类群，贡松科植物有4属24个分类群。Placoneis的中文名最早在这些属中使用。对Placoneis Mereschkowsky属、Encyonema Kutzing属和Cymbopleura(Krammer) Krammer属进行了详细的描述。多年来，Placoneis属于Navicula - lineolatae，但它与Cymbella和Gomphonema的关系更密切，有一个单一的，大而精致的质体，分为两个x形的板，靠在每个瓣膜上，由一个宽柱连接，柱上有一个大的扁平的pyrenoid；单列的条纹，包含由挥发状闭塞闭合的小圆孔；内部中央中缝末端钩向阀门的初级侧；外部中心末端稍膨大；外极末端钩向相同或相反的边。青膜和cymbo胸膜与Cymbella具有细胞背腹侧、瓣沿顶面不对称等特征，但青膜与Cymbella有平行于腹缘的缝系，终裂向腹缘弯曲，无顶孔场。Cymbopleura与cymenema和Cymbella是分开的，因为它的末端裂缝是背向偏转的，没有柱头、柱头状体和顶端孔场。本文报道了中国新记录的15个分类群。它们是Placoneis explata（赫斯特）。Lange-Bertalot, Placoneis interglacialis(公司)。考克斯，亚北极，克莱默，金合欢佛罗伦萨（Grun.）Krammer,Cymbopleura neoheteropleura Krammer,Cymbopleura subcuspidata(Krammer) Krammer,Cymbopleura subrostrata（Cl.）Krammer, elginense(Krammer) Mann,Gomphonema anglicum Ehrenb。, Gomphonema distans (Cl.-Eul)。Lange-Bertalot Reichardt,Gomphonema khentiiense Metzeltin,Lange-Bertalot Nergui,Gomphonema liyanlingae Metzeltin Lange-Bertalot,Gomphonema pala Reichardt,Gomphonema pseudopusillum Reichardt,Gomphonema sagitta Schumann。并给出了与其他类似种的形态差异。并对这些分类群在大兴安岭及世界各地的生境进行了讨论。
Cymbellaceae and Gomphonemataceae were established in 1833 by Greville and 1844 by Kutzing,respectively.But in preliminary study,both families were put into Diatomaceae by Smith 1872 or into Naviculaceae(subfamily Gomphocymbelloideae) by Hustedt 1930.Until 1960―1970s,Patrick Reimer gave these two families the same status as Naviculaceae,belong to Biraphidinales.Round,et al.established a new order – Cymbellales in 1990,based on the structure of diatom valves in SEM,including Rhoicospheniaceae,Anomoeoneidaceae,Cymbellaceae and Gomphonemataceae.Cymbellaceae include: Placoneis Mereschkowsky,Cymbella Agardh,Brebissonia Grun.,Encyonema Kutzing and Gomphocymbella Muller.Krammer seperated Cymbopleura subgenus from Cymbella,Cymbopleura(Krammer) Krammer were established in 1999.Gomphonema Ehrenb.,Didymosphenia Schmidt,Gomphoneis Cl.,Reimeria Kociolek Stoermer and Gomphopleura Reichelt Tempere belonged to Gomphonemataceae.Great Xing’an Mts.locats in northeast of China with a large area of wetland.During the investigation of diatoms from Great Xing’an Mts.,species that belonged to Cymbellaceae and Gomphonemataceae preferred habitats with pH values ranging from 6 to 9.In total,we observed that 5 genera and 44 taxa belong to Cymbellaceae and 4 genera and 24 taxa belong to Gomphonemataceae.The Chinese name for Placoneis was firstly used among these genera.The detailed description for the genera Placoneis Mereschkowsky,Encyonema Kutzing and Cymbopleura(Krammer) Krammer were given.For many years,Placoneis was within Navicula sect-Lineolatae,but it is much closely related to Cymbella and Gomphonema with a single,large elaborate plastid which is divided into two X-shaped plates lying against each valve,connected by a broad column which contains a large flat pyrenoid;Striae uniseriate,containing small round poroids closed by volate occlusions;Internal central raphe endings hooked towards the primary side of the valve;External central endings slightly expanded;External polar endings hooked towards the same or opposite sides.Encyonema and Cymbopleura share some features with Cymbella as cells dorsiventral,valves asymmetrical along the apical plane etc.,but Encyonema was seperated from Cymbella by its raphe system parallel to ventral margin,terminal fissures curved towards ventral margin and without apical pore field.Cymbopleura was seperated from Encyonema and Cymbella because its terminal fissures are dorsally deflected,without stigmata,stigmoids and apical pore fields.In this paper,15 taxa were reported as newly recorded species in China.They are Placoneis explanata(Hust.) Lange-Bertalot,Placoneis interglacialis(Hust.) Cox,Cymbella subarctica Krammer,Cymbopleura florentina(Grun.) Krammer,Cymbopleura neoheteropleura Krammer,Cymbopleura subcuspidata(Krammer) Krammer,Cymbopleura subrostrata(Cl.) Krammer,Encyonema elginense(Krammer) Mann,Gomphonema anglicum Ehrenb.,Gomphonema distans(Cl.-Eul.) Lange-Bertalot Reichardt,Gomphonema khentiiense Metzeltin,Lange-Bertalot Nergui,Gomphonema liyanlingae Metzeltin Lange-Bertalot,Gomphonema pala Reichardt,Gomphonema pseudopusillum Reichardt,Gomphonema sagitta Schumann.The morphological differences with other similar species are given.The habitats of these taxa in Great Xing’an Mts.and around the world were also discussed.