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Grateloupia sensu lato  has had a long and troublesome taxonomic history because of superficial similarities in morphology, ill-defined species boundaries and lack of diagnostic characters that leave many gaps that still need to be fully resolved. In this study, we carried out detailed observations on female reproductive structures, and inferred the phylogenetic relationships of the  Grateloupia -like species occurring in Vietnam based on  rbc L and LSU rDNA sequence analyses. The new species  Phyllymenia nhatrangensis sp. nov . differs from its sister species  P. gibbesii  in the thickness of the cortex. The new species is slightly flattened, composed of two to four main blades, bearing numerous marginal and a few superficial, lanceolate bladelets. Blade sizes of  P. nhatrangensis  are also smaller than those of  P. gibbesii , which are longer and wider. However, the new species shares with species from western Pacific Ocean, such as  P. taiwanensis  and  P. huangiae , the presence of frequent marginal proliferations. Based on  rbc L, the divergence between  P. nhatrangensis  and  P. gibbesii  was 3.3% (39 bp). With the present addition,  Grateloupia sensu lato  now comprises 16 species, including nine species of  Grateloupia , three species of  Phyllymenia , two species of  Yonagunia  and one species each of  Dermocorynus  and  Prionitis .

phycologia

Systematic revision of the  Grateloupia  complex (Rhodophyta) from Vietnam using  rbc L and LSU sequences, with the description of  Phyllymenia nhatrangensis sp. nov.