Chinese Journal of Oceanology and Limnology

, Volume 35, Issue 6, pp 1442–1453 | Cite as

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

  • Xulei Wang (王旭雷)
  • Bangmei Xia (夏邦美)
  • Antonella Bottalico
  • Guangce Wang (王广策)
Biology

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.

Keywords

COI Gelidium johnstonii phylogeny rbcL taxonomy 

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Supplementary material

343_2017_5340_MOESM1_ESM.doc (74 kb)
Tab.S1. Specimens of Gelidium spp. examined in the present study.
343_2017_5340_MOESM2_ESM.doc (49 kb)
Tab.S2. New sequences obtained in the present study.

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Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Xulei Wang (王旭雷)
    • 1
    • 2
    • 3
  • Bangmei Xia (夏邦美)
    • 4
  • Antonella Bottalico
    • 5
  • Guangce Wang (王广策)
    • 1
    • 2
  1. 1.Key Laboratory of Experimental Marine Biology, Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.Laboratory for Marine Biology and BiotechnologyQingdao National Laboratory for Marine Science and TechnologyQingdaoChina
  3. 3.University of Chinese Academy of SciencesBeijingChina
  4. 4.Department of Marine Organism Taxonomy and Phylogeny, Institute of OceanologyChinese Academy of SciencesQingdaoChina
  5. 5.Department of BiologyUniversity of Bari A. MoroBariItaly

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