Two new epibiontic small marine diatom species from China and its phylogenetic implications for the genus Microcostatus

Two new epibiontic small marine diatom species from China and its phylogenetic implications for the genus Microcostatus | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 15 April 2025 V1 Latest version Share on Two new epibiontic small marine diatom species from China and its phylogenetic implications for the genus Microcostatus Authors : Huina Lin , Lanyu Tan , Xiaoye Li , Baohong Chen , Fred Wang-Fat Lee , Steven Jing-Liang Xu , Yahui Gao , and Changping Chen [email protected] Authors Info & Affiliations https://doi.org/10.22541/au.174470765.56841115/v1 223 views 112 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract The diatom genus Microcostatus , initially distinguished from Navicula sensu lato based on Navicula krasskei Hustedt, currently comprises 27 established species worldwide. However, the phylogenetic position of this genus continues to be undetermined. Our study utilized light microscopy, scanning and transmission electron microscopy, along with SSU rDNA and rbcL gene sequencing, to describe two novel species. M. hainanensis L.Y. Tan, Y.H. Gao & C.P. Chen was collected from a Haina sand beach. M. witkowskii H.N. Lin, Y.H. Gao & C.P. Chen was obtained from a Fujian esturine mangrove. Both are small (valve length 2 - 13 μm) with rounded ends and a slightly curved filiform raphe. Additionally, both species possess two axial depressions on both sides of the raphe sternum. Striae that form macroareolae are externally occluded by perforated hymenes. Striae exhibit a distinct radial pattern but are absent at the center of the valve in M. hainanensis , whereas they are nearly parallel and continuous with microcostae in M. witkowskii . Furthermore, microcostae are scarcely discernible and a conopeum is absent in M. hainanensis , whereas microcostae and unperforated conopeum are obviously present in M. witkowskii . Molecular phylogenetic analyses have indicated that these two species are members of the Sellaphoraceae family, rather than the Naviculaceae family. On the other hand, the paired, lateral plastids in M. hainanensis and M. witkowskii differ from the single H-shaped plastid found in the Sellaphoraceae, suggesting a more extensive phylogenetic relationship. Supplementary Material File (1-2025-two new epibiontic small marine diatom species from china and its phylogenetic implications for the genus microcostatus- main text.doc) Download 190.94 KB File (1-figures.docx) Download 1.94 MB File (1-tables.pdf) Download 89.23 KB Information & Authors Information Version history V1 Version 1 15 April 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords microcostatus diatoms intertidal zone new species phylogenetic position Authors Affiliations Huina Lin Xiamen Ocean Vocational College School of Life Science Xiamen University School of Science and Technology, Hong Kong Metropolitan University View all articles by this author Lanyu Tan School of Life Science Xiamen University View all articles by this author Xiaoye Li School of Life Science Xiamen University View all articles by this author Baohong Chen Third Institute of Oceanography Ministry of Natural Resources View all articles by this author Fred Wang-Fat Lee School of Science and Technology, Hong Kong Metropolitan University View all articles by this author Steven Jing-Liang Xu School of Science and Technology, Hong Kong Metropolitan University View all articles by this author Yahui Gao School of Life Science Xiamen University View all articles by this author Changping Chen [email protected] School of Life Science Xiamen University View all articles by this author Metrics & Citations Metrics Article Usage 223 views 112 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Huina Lin, Lanyu Tan, Xiaoye Li, et al. Two new epibiontic small marine diatom species from China and its phylogenetic implications for the genus Microcostatus. Authorea . 15 April 2025. DOI: https://doi.org/10.22541/au.174470765.56841115/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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