Muelleria pseudogibbula, a new species from a newly recorded genus (Bacillariophyceae) in China

The genus Muelleriais reported for the first time from China in this paper. The new diatom species Muelleria pseudogibbulasp. nov. was observed during a survey of diatoms from Zoigê Wetland, Sichuan Province, China. The morphological characters of this new species were documented by light and scanning electron microscope and compared with similar species. M. pseudogibbulais characterized by its lanceolate to linear-lanceolate valve outline with rounded apices, two longitudinal canals running parallel to each side of the raphe, proximal ends of the raphe deflected to the same directions and finishing before the first row of areolae, and curved distal raphe ends, forming two divergent branches.