Species of Amansia and Melanamansia from the tropical Pacific region have been re-examined, and compared with material from the Indian Ocean, Japan, Taiwan and the Philippines. All specimens examined from the Pacific region (except Hawaii and some from New Caledonia and Fiji) lack pseudo-pericentral cells, thus placing them in Amansia. Melanamansia glomerata is only reported from Hawaii, New Caledonia, Fiji, the Philippines, Vietnam, Malaysia and for the first time in the Indian Ocean from Kenya. Type material of Amansia rhodantha (Harvey) J. Agardh from Mauritius was compared and found not significantly different from the Pacific Amansia material (including type and isotype material of Amansia paloloensis South et Skelton from Samoa, which is reduced to synonymy), thus extending the distribution range of A. rhodantha as a pan-tropical entity.
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