New freshwater diatom genus, Edtheriotia gen. nov. of the Stephanodiscaceae (Bacillariophyta) from south‐central China
New freshwater diatom genus, Edtheriotia gen. nov. of the Stephanodiscaceae (Bacillariophyta) from south‐central China
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DOI：
10.1111/pre.12145
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发表时间：
2016-09
影响因子：
1.5
通讯作者：
J. Kociolek;Q. You;Joshua G Stepanek;R. Lowe;Quanxi Wang
中科院分区：
文献类型：
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作者：
J. Kociolek;Q. You;Joshua G Stepanek;R. Lowe;Quanxi Wang
利用光学显微镜和扫描电镜技术描述了采自贵州省荔波县荔波小孔的硅藻科冠盘科一新属新种。guizhoiana gen. & sp. nov.在瓣叶表面有不同长度的条纹，并由精细的条纹组成，朝向边缘和地幔。许多圆形到星状的硅质结节覆盖在瓣膜的外部。门孔的外部开口是短管;门孔的开口缺少管。在内部，一个透明的边缘位于边缘附近。边缘的fultoportulae有两个弓形的岛盖。瓣面有穹隆状筛孔。那些靠近边缘的不向内部开放。1 - 3个无柄至略微凸起的缘孔位于瓣膜表面，朝向边缘;它们不会终止朝向瓣膜中心的缩短条纹。这套特征将这一组与Stephanodicaeae中的其他已知属区分开来。将山西小环藻（Cyclotella shanxiensis）转移到Edtheriotia，使新组合E. shanxiensis（Xie & Qi）Kociolek et al. comb. nov. guizhoiana通过存在开放孔附近的边缘的阀。并将该新属的特征与Stephanodiscaceae的其它属进行了比较。该属的两个物种，不像大多数家庭，只知道从中国和日本的河流和池塘。
We describe a new genus and species of the diatom family Stephanodiscaceae with light and scanning electron microscopy from Libo Small Hole, Libo County, Guizhou Province, China. Edtheriotia guizhoiana gen. & sp. nov. has striae across the valve face of varying lengths, and are composed of fine striae towards the margin and onto the mantle. Many round to stellate siliceous nodules cover the exterior of the valve. External fultoportulae opening are short tubes; the opening of the rimportula lacks a tube. Internally a hyaline rim is positioned near the margin. Marginal fultoportulae possess two arcuate opercles. Areolae have domed cribra on the valve face. Those near the margin do not open to the interior. One to three sessile to slightly‐raised rimportulae are placed on the valve face towards the margin; they do not terminate shortened striae towards the center of the valve. This suite of features distinguishes this group from other known genera in the Stephanodicaeae. Cyclotella shanxiensis is transferred to Edtheriotia, making the new combination E. shanxiensis (Xie & Qi) Kociolek et al. comb. nov. It differs from E. guizhoiana by the presence of open pores near the margin of the valve. Features of the new genus are compared and contrasted with others in the Family Stephanodiscaceae. The two species of the genus, unlike most in the family, are known only from rivers and ponds from China and Japan.