Botany, Ahead of Print.
Light and scanning electron microscopy were used to describe Neidium petersiveri sp. nov., a previously unnamed diatom found in the Canadian waters of Lake Superior. It had been reported previously as single cells of an unidentified Neidium species from four widely separated regions in North America: Michipicoten Island (Lake Superior, Ontario, Canada), Cape Cod (Massachusetts, United States), a Quebec river (Quebec, Canada), and the Back River (Nunavut, Canada). There are superficial resemblances to Neidium mirum Krasske and Neidium calvum Østrup, but there are significant differences in frustule size and shape as well as the pattern of striae on the valve face that render N. petersiveri unique. There was not a significant correlation between frustule lengths and widths in N. petersiveri, owing to a relatively small range within the width data that resulted in much higher width-to-length ratios among shorter cells than for longer cells (74 cells measured). Other significant aspects of morphologic variation include various shapes and configurations of the lacinial fissures and of the proximal raphe fissures, and the sporadic occurrence of pit-like depressions in the axial and central regions of the valves, which suggest that variations in these characters likely have limited value as discriminating characters at the species or subspecies levels.

中文翻译：

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Neidium petersiveri sp. 十一月 (Bacillariophyceae) — 描述一种新的硅藻物种，重点是苏必利尔湖种群中硅藻壳形态的变异性

植物学，超前印刷。
使用光学和扫描电子显微镜来描述 Neidium petersiveri sp。11 月，在加拿大苏必利尔湖水域发现的一种以前未命名的硅藻。之前曾报道过它是来自北美四个广泛分离的地区的未鉴定 Neidium 物种的单细胞：Michipicoten 岛（加拿大安大略省苏必利尔湖）、科德角（美国马萨诸塞州）、魁北克河（加拿大魁北克省）和后河（加拿大努纳武特）。与 Neidium mirum Krasske 和 Neidium calvum Østrup 有表面相似之处，但在壳的大小和形状以及阀面上的条纹图案方面存在显着差异，这使得 N. petersiveri 独一无二。N. petersiveri 的硅藻壳长度和宽度之间没有显着相关性，由于宽度数据的范围相对较小，导致较短电池之间的宽长比比较长电池高得多（测量了 74 个电池）。形态变异的其他重要方面包括裂隙裂和近端中缝裂的各种形状和构造，以及瓣膜轴向和中心区域的零星凹陷样凹陷，这表明这些特征的变异可能具有在物种或亚种级别区分特征的价值有限。