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The brown macroalgal genus  Sargassum  forms beds around the Japanese coast; these beds are important for marine ecosystem functioning and fisheries. In recent years, a northward shift in the distribution patterns of southern  Sargassum  spp. has been postulated as a result of warming in the western Pacific. To examine this theory, we surveyed species richness and diversity of genus  Sargassum  algae around the Ryukyu Islands, Japan, which is the northern limit of selected  Sargassum  species native to tropical and subtropical regions. We collected from Iriomote Island (Ryukyu Archipelago) specimens of a species resembling  Sargassum denticarpum , which is endemic to Vietnam. The specimens had the following morphological characteristics in common with  S. denticarpum : (1) terete or slightly compressed primary branches, (2) simple lanceolate primary and lateral leaves with dentate margins in all stages, (3) spherical-to-elliptical vesicles with or without spines and wings, (4) monoecious, and (5) compressed receptacles with spines on the margins. In addition, internal transcribed spacer 2 ( ITS2 ) sequences of the Ryukyu specimens and of  S. denticarpum  collected in Vietnam clearly showed that the two are closely related. On the basis of these morphological and molecular characteristics, we present the first report of  S. denticarpum  in Japan.

New record of Sargassum denticarpum Ajisaka (Fucales, Phaeophyceae) from Iriomote Island (Ryukyu Archipelago, Japan)