Background The genus Selenocosmia Ausserer, 1871 includes 39 species. Five species were known from China. This genus has not been found in south-eastern China. New information A new species of the genus Selenocosmia Ausserer, 1871 is described from China: Selenocosmia zhangzhengi Lin, sp. n. from Fujian. Photos and a morphological description of the new species are given. The type specimen of the new species is deposited in the Institute of Zoology, Chinese Academy of Sciences in Beiing (IZCAS).