Natural lakes are rarely found in South Africa and are usually restricted to coastal regions. One of the larger coastal lakes is Lake Sibaya, which is situated in North-Eastern Kwa-Zulu Natal, a subtropical summer rainfall region. In 1966 a survey of this and other smaller lakes connected to the Lake Sibaya system was conducted and diatom samples were collected, of which three were examined by R.E.M. Archibald, and from which nine new species were described. Archibald illustrated these new taxa using line drawings; the interpretation of such illustrations for species identification is sometimes difficult. For this reason we have re-examined the type material with the aim of producing light microscope (LM) and scanning electron microscope (SEM) micrographs of the species in question. All nine taxa described and illustrated by Archibald were found again in the type slides and photographed from the holotype slides using LM. Unfortunately the preserved type material was stored in un-buffered formalin and had degraded to a point where it could no longer be used for SEM. Additional desiccated samples collected during later expeditions between 1966 and 1972 were selected, based on similarity of locality and substratum, and used to obtain SEM micrographs. Again, all taxa could be documented from material in these additional samples. Of the nine taxa described, we transferred four to more appropriate genera, as they were originally described as species of Achnanthes and Navicula. Although Archibald’s line drawings were detailed and accurate, it was necessary to document these types using LM and SEM in order to make accurate designations at generic level and to facilitate identification of these taxa if found in other localities.

中文翻译：

---

来自南非锡巴亚湖和恩兰格湖的 REM Archibald 硅藻类型

天然湖泊在南非很少见，通常仅限于沿海地区。较大的沿海湖泊之一是锡巴亚湖，它位于东北夸祖鲁纳塔尔省，一个亚热带夏季降雨区。1966 年，对该湖和与西巴亚湖系统相连的其他较小湖泊进行了调查，并收集了硅藻样本，其中三个由 REM Archibald 进行了检查，并从中描述了九个新物种。Archibald 使用线条图说明了这些新的分类群；有时难以解释用于物种识别的此类插图。出于这个原因，我们重新检查了类型材料，目的是制作相关物种的光学显微镜 (LM) 和扫描电子显微镜 (SEM) 显微照片。Archibald 描述和说明的所有九个分类群都在类型幻灯片中再次发现，并使用 LM 从正模幻灯片中拍摄。不幸的是，保存型材料储存在未缓冲的福尔马林中，并且已经降解到无法再用于 SEM 的程度。根据地点和基质的相似性，选择了 1966 年至 1972 年后期探险期间收集的其他干燥样品，并用于获得 SEM 显微照片。同样，所有分类群都可以从这些额外样本中的材料中记录下来。在描述的九个分类群中，我们将四个转移到更合适的属中，因为它们最初被描述为 Achnanthes 和 Navicula 的物种。虽然阿奇博尔德的线条图详细而准确，