The genus Entomoneis includes diatoms with an elevated bilobate keel, a sigmoid raphe canal and numerous girdle bands. It is known to inhabit various environments, from freshwater to marine, both plankton and benthos. During a phytoplankton investigation in the Kungälv estuary on the west coast of Sweden, we observed numerous cells belonging to Entomoneis. Further morphological investigations performed with light and electron microscopy allowed us to describe Entomoneis annagodhei, sp. nov., with a unique set of morphological characters. Most importantly, a still undocumented character proved to be an oblique transapical fascia across the centre of the valve. Other distinctive features of this species are a pronounced raphe canal with dense raphe fibulae, very fine striation, resolvable only with electron microscopy, external lanceolate slit-like opening of the central nodule, and fine, linear to undulate external ridges running more or less parallel and adjacent to the raphe and valve margin. The morphological characters and morphometry are discussed in comparison with similar taxa. Our results contribute to the under-appreciated diversity of Entomoneis, especially inhabiting the marine plankton.

中文翻译：

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Entomoneis annagodhei sp. 11月，来自瑞典西海岸的一种新的海洋硅藻（昆虫纲，芽孢杆菌属）

Entomoneis 属包括具有升高的双叶状龙骨、乙状缝管和许多环带的硅藻。众所周知，它栖息在各种环境中，从淡水到海洋，包括浮游生物和底栖生物。在瑞典西海岸 Kungälv 河口的浮游植物调查中，我们观察到了许多属于昆虫纲的细胞。使用光学和电子显微镜进行的进一步形态学研究使我们能够描述 Entomoneis annagodhei，sp。11 月，具有一组独特的形态特征。最重要的是，一个仍然没有记录的角色被证明是一个横跨瓣膜中心的斜经心尖筋膜。该物种的其他显着特征是明显的中缝管和密集的腓骨中缝，非常细的条纹，只能用电子显微镜分辨，中央结节的外部披针形狭缝状开口，以及细长的、线性的、波浪形的外部脊，或多或少地平行并邻近中缝和瓣膜边缘。与相似的分类群比较讨论了形态特征和形态测量学。我们的研究结果导致了被低估的 Entomoneis 多样性，尤其是栖息在海洋浮游生物中。