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The genus  Orthoseira  Thwaites contains centric diatoms typically inhabiting marginal-aquatic or terrestrial habitats. The high morphological plasticity of representatives of the genus and their occurrence in rarely studied terrestrial habitats complicates an overall assessment of their biodiversity and the distribution of particular species. This study presents a description of four new species of this genus from Southeast Asia and Easter Island. They include:  O. radiata  M.Rybak, Glushchenko &amp; Kulikovskiy sp. nov.,  O. distincteareolata  M.Rybak, Glushchenko &amp; Kulikovskiy sp. nov.,  O. cylindrica  M.Rybak, Glushchenko &amp; Kulikovskiy sp. nov. and  Orthoseira rapanuiensis  M.Rybak, Witkowski &amp; Lange-Bertalot sp. nov. Additionally, we attempt to provide a solution to the confused taxonomical history of  Liparogyra circularis  Ehrenberg and provide the first detailed description of  Orthoseira tropica  (Krasske) Metzeltin &amp; Lange-Bertalot.

Diversity of the genus Orthoseira Thwaites (Bacillariophyceae) from Southeast Asia and Rapa Nui Island with descriptions of four new taxa