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ABSTRACT
A survey of the testate amoebae of northwest Yunnan in the Hengduan Mountains region of southwest China revealed 151 species belonging to 29 genera. Of these, three genera and 27 species were new to the testate amoebae fauna of China. The widely distributed and dominant species were Centropyxis aculeata aculeata, C, aerophila aerophila, C. sylvatica, Difflugia elegans, D. globulosa, D. pristis, D. pulex, Phryganella hemisphaerica, Trinema enchelys, and T. lineare. The most diverse genera were Difflugia (41 species), Centropyxis (31 species), Arcella (18 species), and Euglypha (11 species). The number of species in each sample varied greatly. It appears that species diversity of testate amoebae is related not only to macro-environments (e.g., geographic zonation) but also to microenvironments (e.g., microhabitats).