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Studies of the taxonomy and diversity of flattened  Gracilaria  species which occur commonly in coastal areas of Thailand are few and underestimate species richness. Recently, flattened  Gracilaria  plants were collected along the west coast of southern Thailand (Andaman Sea). We describe a new flattened  Gracilaria  species,  Gracilaria coppejansii  Muangmai, Lewmanomont, Prathep, Terada  et  Zuccarello sp. nov., from Phuket Island on the basis of comparative morphology and  rbc L sequence analyses of these samples. The new species is mainly characterized by thalli with dichotomous branching, numerous proliferations on the blade margin of female gametophytes,  textorii -type spermatangial conceptacles and a few nutritive filamentous cells in mature cystocarps. Morphologically , G. coppejansii  most closely resembles  Gracilaria textorii  but differs in some morpho-anatomical characteristics of the blade and female reproductive structures.  rbc L sequence analyses also clearly demonstrated that  G. coppejansii  was genetically distinct from other flat  Gracilaria  species.  Gracilaria coppejansii  was phylogenetically positioned close to  Gracilaria lantaensis , a recently described flattened species also on the west coast of Thailand.

Gracilaria coppejansii sp. nov. (Gracilariales, Rhodophyta), a new flattened species from the Andaman coast of southern Thailand