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A new marine monoraphid diatom species, Planothidiumpseudolinkei sp. nov. , is described from the coast of Guangxi, China. The detailed morphology of this epipsammic diatom is studied by using both light and scanning electron microscopy. P.pseudolinkei differs from congeners by a combination of morphological features including capitate apices, multiseriate striae, a small central area on the raphe valve and an oblong sinus on the rapheless valve. Ecological preferences of Planothidium are also briefly discussed., Competing Interests: The authors have declared that no competing interests exist., (Lang Li, Yu-Yang Huang, Qun-Zhuan Nong, Jun-Xiang Lai, Yu-Hang Li.)

Two new diatom species belonging to the genus Gomphonemopsis are described, Gomphonemopsisnana sp. nov. and Gomphonemopsisgaoi sp. nov. These two species were compared in detail with congeners. Gomphonemopsisnana is distinguished by its high stria density and small size. This species was found so far to be epiphytic only on the eelgrass collected from Qingdao Bay (Yellow Sea). Gomphonemopsisgaoi is characterized by its isopolar valves, simple proximal raphe endings and acutely rounded apices. This taxon was separated from the exoskeleton of marine copepods sampled from the Futian Mangrove Nature Reserve (South China Sea). In addition, two new combinations, Gomphonemopsisoahuensis (Østrup) Lang Li, Yuhang Li & Junxiang Lai, comb. nov. and Gomphonemopsisplatypus (Østrup) Lang Li, Yuhang Li & Junxiang Lai, comb. nov. are proposed. This study increases the records and knowledge of Gomphonemopsis along the coast of China., Competing Interests: The authors have declared that no competing interests exist., (Lang Li, Qun-Zhuan Nong, Chang-Ping Chen, Yu-Hang Li, Jun-Xiang Lai.)