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Taxonomic revision of Gelidium tsengii and Gelidium honghaiwanense sp. nov. (Gelidiales, Rhodophyta) from China based upon molecular and morphological data analyses

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Abstract

The taxonomic relationship of Chinese Gelidium tsengii and Gelidium johnstonii was ambiguous. For almost 20 years they have been regarded as distinct taxa and until 2002 G. johnstonii was considered as a misapplied name of G. tsengii. In this study, herbarium specimens that initially attributed to G. tsengii and fresh G. tsengii specimens were used to address the taxonomic issues. In phylogenetic studies, G. tsengii from Dayawan, China, near the type locality of G. tsengii and G. johnstonii from Sonora, Mexico, the type locality of G. johnstonii, formed a monophyletic group with maximum support in rbcL and COI genes analyses, indicating that they were genetically identical. In morphological studies, G. tsengii was similar to G. johnstonii in branching pattern, inner structures and fructiferous organs. Consequently, we considered that semi-circular outline of G. tsengii could no longer be treated as a discrimating feature. G. johnstonii had priority of publication and according to the International Code of Botanical Nomenclature, G. tsengii was proposed as a synonym of G. johnstonii. Gelidium honghaiwanense sp. nov. was described from Guangdong, China on the basis of morphological and molecular data. For vegetative structures, it was characterized by flattened upright frond, regular two-three times branches pinnate or alternate and clavate ultimate branchlets. For reproductive structures, the tetrasporangial sori were in the apical part of branches and the tetrasporangial branchlets were distichously distributed along second order branches. The present study clarified the relationship between G. tsengii and G. johnstonii from Guangdong and added a new Gelidium species to the Chinese algal flora.

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Authors and Affiliations

  1. Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China

    Xulei Wang  (王旭雷) & Guangce Wang  (王广策)

  2. Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China

    Xulei Wang  (王旭雷) & Guangce Wang  (王广策)

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Xulei Wang  (王旭雷)

  4. Department of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China

    Bangmei Xia  (夏邦美)

  5. Department of Biology, University of Bari A. Moro, Bari, 70125, Italy

    Antonella Bottalico

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  1. Xulei Wang  (王旭雷)
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  2. Bangmei Xia  (夏邦美)
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  3. Antonella Bottalico
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  4. Guangce Wang  (王广策)
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Correspondence to Guangce Wang  (王广策).

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Supported by the Strategic Leading Science and Technology Projects of Chinese Academy of Sciences (Nos. XDA11020404, XDA11020304), the China Postdoctoral Science Foundation (No. 2016M592260), the National Natural Science Foundation of China (No. 41376164), and the Scientific and Technological Innovation Project financially supported by Qingdao National Laboratory for Marine Science and Technology (No. 2016ASKJ02)

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Wang, X., Xia, B., Bottalico, A. et al. Taxonomic revision of Gelidium tsengii and Gelidium honghaiwanense sp. nov. (Gelidiales, Rhodophyta) from China based upon molecular and morphological data analyses. Chin. J. Ocean. Limnol. 35, 1442–1453 (2017). https://doi.org/10.1007/s00343-017-5340-1

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  • DOI: https://doi.org/10.1007/s00343-017-5340-1

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