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Grateloupia tenuis  Wang et Luan sp. nov. is a new species described from Lingshui, Hainan Province, South China Sea. Based on the external form and internal structure, combined with  rbc L gene sequence analysis,  Grateloupia tenuis  is distinct from other  Grateloupia  species as follows: (1) thalli is slippery and cartilaginous in texture; possess fewer branches, relatively slight main axes, and two or three dichotomous branches; (2) cortex is 5-6 layers; medulla is solid when young, but hollow in old branches; reproductive structures are dispersed in main axes of thalli and lower portions of branchlets; exhibits  Grateloupia -type auxiliary cell ampullae; (3) the four studied  G. tenuis   sequences were positioned in a large  Grateloupia  clade of Halymeniaceae, which included sister group generitype  G. filicina  with 68 bp differences;  G. tenuis  was determined to be a sister taxon to the  G. catenata ,  G. ramosissima ,  G. orientalis , and  G. filiformis  subclade. The pairwise distances between  G. tenuis  and these species were 39 to 50 bp. The sequences of  G. tenuis  differed by 81–108 bp from the sequences of other samples in  Grateloupia ; there are 114–133 bp changes between  G. tenuis  and other genera of Halymeniaceae. In final analysis, we considered  Grateloupia tenuis  Wang et Luan sp. nov. to be a new species of genus  Grateloupia .

biomed research international

<i>Grateloupia tenuis</i>Wang et Luan sp. nov. (Halymeniaceae, Rhodophyta): A New Species from South China Sea Based on Morphological Observation and<i>rbc</i>L Gene Sequences Analysis

Grateloupia tenuisWang et Luan sp. nov. (Halymeniaceae, Rhodophyta): A New Species from South China Sea Based on Morphological Observation andrbcL Gene Sequences Analysis