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. 2018 Dec 20;8:17986. doi: 10.1038/s41598-018-35528-8

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Progress of the number of taxonomic descriptions of the Hydrozoa (blue dots, left vertical axis) and of the superfamily Plumularioidea (red dots, right vertical axis) between the years 1758 and 2017. We considered only currently accepted species. Data source: WoRMS²⁷.