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Zhongmin SUN, Minh Dong DAO, Quoc Toan TRAN, Duc Tien DAM. A new species Lobophora tsengii sp. nov. (Dictyotales; Phaeophyceae) from Bach Long Vy (Bailongwei) Island, Vietnam[J]. Journal of Oceanology and Limnology, 2021, 39(6): 2363-2369

A new species Lobophora tsengii sp. nov. (Dictyotales; Phaeophyceae) from Bach Long Vy (Bailongwei) Island, Vietnam

Zhongmin SUN1,2, Minh Dong DAO3, Quoc Toan TRAN3,4, Duc Tien DAM3,5,6
1 Department of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Graduate University of Science and Technology, Vietnam Academy of Science and Technology(VAST), Hanoi 100000, Vietnam;
4 Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology(VAST), Cau Giay, Hanoi 100000, Vietnam;
5 Institute of Marine Environment and Resources(IMER), Vietnam Academy of Science and Technology(VAST), Haiphong 180000, Vietnam;
6 Haiphong University of Medicine and Pharmacy, Haiphong 180000, Vietnam
A new species Lobophora tsengii is described from Bach Long Vy (Bailongwei) Island, Haiphong Province, Vietnam. The plants inhabit the subtidal zone and have predominantly erect fan-shaped thalli that attach to the substrate by a basal holdfast. The thallus is commonly composed of a single layer of large medullary cells with four layers of cortical cells on either side of the medulla. The newly collected specimens from the island are morphologically similar to those from Hainan Island, China, but differ from the New Caledonian ones in having thicker thallus. In molecular phylogenetic analyses based on concatenated rbcL and cox3 s equences, the specimens from the island were 100% identical to those from Hainan Island, China, and they formed a clade separating from other Lobophora species. Additionally, based on analyses of numerous cox3 s equences, our specimens were also distinguished from the closely related taxa occurring in New Caledonia, Kenya, and West Australia. Combining the morphological and molecular analyses, we conclude that our specimens represent a new species of Lobophora, which is apparently endemic to the Beibu Gulf (Gulf of Tonkin) and adjacent waters.
Key words:    Bach Long Vy (Bailongwei) Island|cox3|Lobophora|molecular phylogeny|morphology|rbcL   
Received: 2020-07-31   Revised: 2020-09-28
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