Platynectes hainanensis Nilsson, 1998 (Figs 3D, 7A–B, 9A, 11B) Platynectes hainanensis Nilsson, 1998: 110 (orig. descr.); Šťastný 2003: 246 (notes). Type locality. “ China, Hainan, 30km E Maoyang, Wuzhi Shan Resort ”, ca. 18.9092N, 109.6776E, 700–800 m. Type material. Holotype ♂, deposited in IAECAS. Material examined. CHINA: Hainan: 1 ♀, Jianfengling Mt. (Five), 25.vi.1981, light trap, H. Rao leg. (SYSU); 5 ♂, 4 ♀, Limushan Mt., Limu Temple, 5.v.2011, S. Zhao leg. (SYSU); 6 ♂, 3 ♀, main peak of Limushan Mt., 6.v.2011, S. Zhao leg. (SYSU); 2 ♂, third and fifth divisions of Jianfengling Mt., 9.v.2011, S. Zhao leg. (SYSU); 6 ♂, 2 ♀, Changjiang County, Bawangling Mt., Bawang Stone Sea, 19.0814N, 109.1233E, 550 m, 22.v.2022, Z. Jiang leg. (SYSU). Notes. Habitus and male genitalia are given in Figs 3D and 7A–B. Collection details. Platynectes hainanensis was collected at stream bottoms among decaying leaves in Limushan Mt. (Hainan) (Fig. 9A). Distribution. Known only from the Hainan Province, China (Fig. 11B).

Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Jia, Feng-Long & Šťastný, Jaroslav, 2023, Two new species of Platynectes Régimbart, 1879 from China with notes on other Chinese members of the genus, including a key to species (Coleoptera: Dytiscidae: Agabinae), pp. 401-425 in Zootaxa 5227 (4) on page 409, DOI: 10.11646/zootaxa.5227.4.1, http://zenodo.org/record/7518878