The genus Mesotrichosiphum Calilung, an endemic southeastern Asian group, is reviewed to include Mesotrichosiphum pentaiarticulatum Zhang and Qiao, sp. nov. from China (Hainan). The generic diagnosis is supplemented in here, and a key is given to all species worldwide. Some hitherto unknown morphs of Mesotrichosiphum are described. New data on distributions and host plants are reported for the genus. The type specimens are deposited in Zoology Museum, Institute of Zoology, Chinese Academy of Sciences.
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