中国硅藻1新记录种——喙状比利牛斯山微小曲壳藻

Achnanthidium rostropyrenaicum,a New Diatom Record from China

利用光学和扫描电子显微镜对采自武陵山区澧水的1种中国新记录硅藻——喙状比利牛斯山微小曲壳藻进行了形态研究。该种的鉴定特征为壳面线形披针形,具有喙状的末端,有壳缝壳面末端线纹呈略微会聚状或近平行排列,孔纹膜为筛状。该研究结果扩展了对喙状比利牛斯山微小曲壳藻形态结构和地理分布的认识。

A thoroughly study is carried out on an Achnanthidium species from Li River in Wuling Mountains area using light and scanning electric microscopy.The results confirm that this Achnanthidium species is indeed Achnanthidium rostropyrenaicum.A.rostropyrenaicumpossesses two key features:the linear-lanceolate valve outline with rostrate ends and the slightly convergent or nearly parallel striae distributed at the ends of the raphe valve.The hymens,which were not involved in the original description,also are studied.The hymenes are sieve-like.This study expands the knowledge of the morphological structure and geology distribution of A. rostropyrenaicum.