Two naviculoid diatoms with an internal tubular process that opens externally through a pore or process on the valve face were observed on the hull of R/V Onnuri of the Korea Institute of Ocean Science & Technology in South Korea. Owing to the presence of distinctive morphological features, namely the buciniportula and an internal marginal canal, these diatoms were assigned to the genus Olifantiella, which was recently described from tropical regions. Of these two species, one (Olifantiella onnuria sp. nov.) is new to science. It can be distinguished from other Olifantiella species by two, internally closed, bean-like buciniportulae, and an external T-shaped groove near the terminal raphe endings. These morphological characteristics resemble those of the genus Labellicula, however, the presence of an internal marginal canal does not match Labellicula. The other Olifantiella species is identical to O. muscatinei, which possesses occluded fenestrulae on the valve face. The occurrences of these two Olifantiella species are the first records for the temperate Pacific region and their presence on a ship's hull indicates that Olifantiella spp. may be dispersed widely along shipping routes.

中文翻译：

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来自西北温带太平洋沿岸的两种污损 Olifantiella（Bacillariophyceae）

在韩国韩国海洋科学技术研究所的 R/V Onnuri 船体上观察到两种具有内部管状过程的舟状硅藻，通过阀门表面的孔或过程向外打开。由于存在独特的形态特征，即 buciniportula 和内部边缘管，这些硅藻被归为 Olifantiella 属，最近在热带地区描述了它。在这两种物种中，一种（Olifantiella onnuria sp. nov.）是科学上的新物种。它可以通过两个内部封闭的豆状 buciniportulae 和靠近中缝末端的外部 T 形凹槽与其他 Olifantiella 物种区分开来。这些形态特征类似于 Labellicula 属的特征，然而，内部边缘管的存在与 Labellicula 不匹配。其他 Olifantiella 物种与 O. muscatinei 相同，后者在瓣膜面上具有闭塞的窗孔。这两种 Olifantiella 物种的出现是温带太平洋地区的第一个记录，它们出现在船体上表明 Olifantiella spp。可能沿航线广泛分布。