Most of our planet’s biodiversity is still unknown, particularly in the sea. Although around the island of Sylt in the North Sea, the small zoobenthos (meiofauna) has been studied intensively since the 1950s, repeating previous surveys revealed an unexpected wealth of new species in addition to the 330 species of free-living microturbellarians (non-parasitic Platyhelminthes) already known from this area. Extrapolation from well-known to less-known habitat types suggests that a total of some 520 Platyhelminth species should be expected around this island, about 670 in the North Sea ecoregion, and 830 in the ‘Northern European Sea’ ecoprovince. Assuming that the other biogeographic provinces of the planet harbour a similar diversity, a total of some 20,000 marine microturbellarian species is estimated for the global shelf zones. Less than 10% of these are known by now. As a contribution to fill that gap, ten new taxa are described: Coelogynopora minuta n. sp., Coelogynopora sopottehlersae n. sp., Cirrifera paraculeata n. sp., Boreocelis fragilis n. sp., Postbursoplana noldti n. sp., Promesostoma wehrenbergi n. sp., Ptyalorhynchus oculatus n. sp., Acrorhynchides canaliculatus n. sp., Dactyloplana n. gen., and Dactyloplana tridigitata n. sp.

中文翻译：

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海洋底栖生物中未知的生物多样性：较小的空缺，其中描述了来自经过充分研究的北海的十种新的侧柏类群

我们星球的大多数生物多样性仍然未知，特别是在海洋中。尽管在北海的叙尔特岛周围，自1950年代以来就对小型的动物底栖动物（meiofauna）进行了深入研究，但重复进行的先前调查显示，除了330种自由活动的微动轮虫（非寄生虫）之外，还拥有大量新物种侧柏（Plathelhelminthes））在这一领域已广为人知。从著名的栖息地类型到鲜为人知的栖息地类型的推断表明，在该岛周围，预计将有总共520个侧柏物种，北海生态区约670个，“北欧海”生态省830个。假设地球上的其他生物地理省份也具有类似的多样性，则估计全球陆架区总共约有20,000种海洋微动植物物种。到现在为止，只有不到10％的已知。为了填补这一空白，我们介绍了十个新的分类单元：Coelogynopora minuta n。sp。，Coelogynopora sopottehlersae n.。sp。，Cirrifera paraculeata n。sp。，脆弱的疏藻 sp。，Postbursoplana noldti n。sp。，Promesostoma wehrenbergi。sp。，Ptyalorhynchus oculatus。sp。，Acrorhynchides canaliculatus n.。sp。，乳齿藻 gen。，and Dactyloplana tridigitata n。sp。