Abstract
We describe a new species, Dipterocladia cylindrica, found in the subtidal zone of the eastern and southern coasts of Korea. This species has cylindrical branches with numerous sub-dichotomously branching monosiphonous determinate branchlets without adventitious filaments, heavy cortication throughout the thallus, and alternating clockwise periaxial cell formation. The external features of the new species are closer to those of the genus Dasya than to those of Dipterocladia, which have flattened thalli with pairwise distichously arranged monosiphonous pseudolateral and polysiphonous determinate laterals. However, based on the combined results of plastid rbcL and mitochondrial COI–5P sequences, the molecular phylogenetic relationships clearly indicate that our specimens belong to the genus Dipterocladia. We also detected more meaningful morphological characters for delineating the genus within the subfamily Dasyoideae by comparing the morphology and phylogeny, but we could not find unique characters for each clade. Further studies based on reproductive morphology and molecular phylogeny for delimiting the generic boundaries are needed.
Funding source: National Research Foundation of Korea
Award Identifier / Grant number: 2019R1A6A1A10072987
About the authors
Jeong Chan Kang is a researcher at Research Institute for Basic Sciences in Jeju National University. He has studied the taxonomy of the Ceramiales, especially Delesseriaceae using morphological observations and molecular analysis. He is also interested in the changes of macroalgal assemblage caused by anthropogenic factors.
Mi Yeon Yang is a research professor at Research Institute for Basic Sciences in Jeju National University. She is interested in red algal taxonomy, especially the Gigartinales. Her research using a combination of morphological and molecular approaches led to the description of several new species. She is also interested in the phylogeography of red macroalgae.
Yeo Kyeong Oh was a graduate student in the Department of Biology at Jeju National University.
Myung Sook Kim is a professor at the Department of Biology, and the director of the Research Institute for Basic Sciences at Jeju National University, Korea. She received her PhD in Algal Systematics from the Seoul National University, Korea. She has been studying the phylogeny of Rhodophyta for a long time, and recently focused on genetic diversity using DNA barcode of seaweeds for accurate identification of species. Her current research is also centered on the phylogeography of seaweeds found in Korea.
Acknowledgments
We thank our members of the Molecular Phylogeny of Marine Algae Laboratory at Jeju National University for helping in the collection of samples. We also thank to Mr. Hyun, B.C. and Mr. Kim, G.S for underwater guidance during the surveys to this study.
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Research ethics: Not applicable.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript.
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Competing interests: The authors declare that they have no conflicts of interest related to this article.
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Research funding: This study was supported by the management of the Marine Fishery Bio-resources Center (2023) funded by the National Marine Biodiversity Institute of Korea (MABIK) and Basic Science Research Program (2019R1A6A1A10072987) through the National Research Foundation of Korea (NRF) to Research Institute for Basic Sciences (RIBS) of Jeju National University.
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Data availability: Not applicable.
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