The first comprehensive morphological investigation of the rare, endemic species Cymbella mirabilis Hustedt from the Malili lake system (Indonesia) was prepared using recent samples. This species was originally described on the basis of a single valve. The species was assigned to Cymbella sensu lato on the basis of its asymmetry about the apical axis. SEM investigation shows that this species has a number of unique features relative to other freshwater cymbelloid diatoms, such as an axial plate and marginal laminae on either side of the valve and pseudoseptum at each end of the valve. In these features C. mirabilis resembles certain species in genera such as Gomphoneis Cleve, Afrocymbella Krammer, Gomphosinica Kociolek et al. and Gomphonema Ehrenberg. The unique combination of features in this taxon suggest it cannot be placed in any known genus within the Cymbellales. Thus, we describe a new diatom genus, Alveocymba gen. nov., however, the taxonomic placement of this new genus remains unclear and requires further investigation.

中文翻译：

---

Cymbella mirabilis Hustedt 的重新发现，一种罕见的地方性硅藻，以及 Alveocymba gen 的描述。十一月

使用最近的样本对来自马里湖系统（印度尼西亚）的稀有特有物种 Cymbella mirabilis Hustedt 进行了首次全面的形态学调查。该物种最初是根据单个阀门进行描述的。根据其关于顶轴的不对称性，该物种被归类为 Cymbella sensu lato。SEM 调查表明，该物种相对于其他淡水伞形硅藻具有许多独特的特征，例如瓣膜两侧的轴板和边缘薄层以及瓣膜两端的假隔膜。在这些特征中，奇异奇异果类似于属中的某些物种，例如 Gomphoneis Cleve、Afrocymbella Krammer、Gomphosinica Kociolek 等。和 Gomphonema Ehrenberg。该分类单元的独特特征组合表明它不能被置于 Cymbellales 内的任何已知属中。因此，我们描述了一个新的硅藻属，Alveocymba gen。11 月，然而，这个新属的分类位置仍不清楚，需要进一步调查。