In recent years the taxonomy of Haslea has been in flux. We describe several Haslea taxa from Guam, including four new species, in light of these recent findings. Four delicate, fusiform Haslea species are described from a variety of benthic habitats on coral reefs. These species, H. fusiformis comb. nov. and H. alexanderi, H. apoloniae and H. guahanensis spp. nov. are distinguished by stria density, foramen (‘areola’) shape, and cell size from each other and from similar taxa. A key to all these taxa is provided. In addition, an arcuate species is described as Haslea arculata sp. nov. The presence of a bilayered wall is shown for all these taxa. We compare the morphology of specimens reported as H. howeana from Guam with Navicula tsukamotoi, recently described from Okinawa, and with ‘Navicula cf. howeana’ from Puerto Rico. We provide the first account of the complex cingulum of N. tsukamotoi. We conclude that our specimens match N. tsukamotoi and that H. howeana should be returned to Navicula, but we leave open the question of conspecificity.

中文翻译：

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关岛（马里亚纳群岛，西太平洋）底栖海洋植物群中的非蓝色 Haslea 物种（Bacillariophyceae：Naviculaceae）。

近年来，Haslea 的分类一直在变化。根据这些最近的发现，我们描述了来自关岛的几个 Haslea 分类群，包括四个新物种。描述了来自珊瑚礁上各种底栖栖息地的四种精致的梭形 Haslea 物种。这些物种，H. fusiformis 梳子。十一月 和 H. alexanderi、H. apoloniae 和 H. guahanensis spp。十一月 以纹状密度、孔（“乳晕”）形状和细胞大小相互区分，并与相似的分类群区分开来。提供了所有这些分类群的关键。此外，弓形物种被描述为 Haslea arculata sp。十一月 所有这些分类群都显示了双层壁的存在。我们比较了来自关岛的 H. howeana 标本的形态与最近从冲绳描述的 Navicula tsukamotoi 以及 'Navicula cf. howeana' 来自波多黎各。我们首次介绍了 N. tsukamotoi 的复杂扣带。我们得出结论，我们的标本与 N. tsukamotoi 相匹配，并且 H. howeana 应该返回 Navicula，但我们留下了同种性问题。