管壳缝类硅藻中国新记录属种——非洲南氏藻

利用光学和电子显微镜对采自黄海水域的1个管壳缝类硅藻——非洲南氏藻进行了形态学研究,并对其地理分布进行了讨论。结果表明:(1)该种壳体带面呈矩形,壳面窄椭圆形,具有钝圆的末端。(2)壳缝居中,由两条等长的分支组成。(3)管壳缝由复杂、接合的肋突支撑,但无龙骨。(4)每条线纹仅有1个孔纹,壳套上最多有1列孔纹。(5)目前本种仅发现于南非萨尔达尼亚湾和中国黄海。非洲南氏藻是该属在中国的第一个报道种类,因此,该属也是在中国第一次报道。

Nagumoea africana, a Newly Recorded Canal Raphe Bearing Diatom Genus and Species from China

Based on the light and electron microscopy, we carried out a morphological study on a canal raphe bearing diatom species Nagumoea africana from the Yellow Sea, China. Geographical distributions of this species were also herein discussed. The results show that: (1) N. africana frustules are rectangular in girdle view, and the valves are narrowly elliptical with broadly rounded apices. (2) The raphe is located along the valve median line and composed of two branches of equal length. (3) The raphe canal is supported by complex, anastomosing fibulae without a keel. (4) Each stria bears one areola, and a row of areolae may also be present along the mantle. (5) N. africana is now only found in the Saldanha Bay of South Africa and the Yellow Sea of China. This taxa is the first reported species of this genus in China, representing the first record of the genus Nagumoea in China.