Aplectana hainanensis sp. nov. (Ascaridida, Cosmocercidae) from the intestines of Goniurosaurus bawanglingensis (Squamata, Eublepharidae) is described and illustrated. Aplectana hainanensis sp. nov. represents the 52nd species assigned to the genus and the 5th species reported from the Sino-Japanese region. It is easily separated from the 4 species previously reported from the region by the distribution pattern of male caudal papillae: A. macintoshii has an irregular pattern; A. hylae has no precloacal papillae; A. fujianae has 1 pair of precloacal papillae; A paucipapillosa has 3 pairs of precloacal papillae; Aplectana hainanensis sp. nov. has 7 pairs of precloacal papillae.
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