A–J Margattea concava A–E sample from Diaoluoshan, Hainan (voucher ID: M27_5), male F–J sample from Jianfengling, Hainan (voucher ID: M_AY), male K–R Margattea mckittrickae, sample from Baoting, Hainan (voucher ID: M29_1), male S–Y Margattea angusta, male A, F, K, S dorsal view B, G, L, T ventral view C, H, M, U eighth abdominal terga, ventral view D, I, N, V supra-anal plate and paraprocts, ventral view E, J, R, Y subgenital plate and phallomeres, dorsal view O, W left phallomere, dorsal view P median phallomere, dorsal view Q, X hook-like phallomere, dorsal view. Scale bars: 5 mm (A–B, F–G, K–L, S–T), 0.5 mm (C–E, H–J, M–R, V–Y).