Amemboa riparia J. Polhemus & Andersen 1984

Amemboa riparia J. Polhemus & Andersen, 1984 Figs 2 H, I, 3 G, H, 6 H, I, 7 G, H, 8 G, H, 9 G, H, 10 G, H, 11 G, H, 12 H, I, 15 C, D, 17, 18 Material examined. 1 ♂, 1 ♀ (apterous), China, Yunnan Province, Xi-shuang-ban-na Autonomous Prefecture, Jing-hong City, Pu-wen Town; 22 ° 30 ' 36.5 " N, 101 ° 3 ' 55.5 " E; 880 m a. s. l.; 25 Apr. 2011; Zhen Ye leg. (NKUM) • 7 ♂♂, 6 ♀♀ (apterous), China, Yunnan Province, Xi-shuang-ban-na Autonomous Prefecture, Jing-hong City, Man-dian Village, Na-ban-he Nature Reserve; 22 ° 7 ' 48.5 " N, 100 ° 39 ' 46.1 " E; 629 m a. s. l.; 28 Jul. 2016; Zhen Ye leg. (NKUM) • 1 ♂ (apterous), China, Yunnan Province, Xi-shuang-ban-na Autonomous Prefecture, Jing-hong City, Meng-la County, Meng-lun Town, Ba-ka-xiao-zhai Village; 21 ° 57 ' 57.0 " N, 101 ° 12 ' 16.2 " E; 747 m a. s. l.; 5 Jul. 2018; Juan-juan Yuan and Yan-fei Li leg. (NKUM) • 1 ♂ (apterous), China, Yunnan Province, Xi-shuang-ban-na Autonomous Prefecture, Jing-hong City, Meng-la County, Mo-han Town; 21 ° 11 ' 51.0 " N, 101 ° 41 ' 55.8 " E; 17 Aug. 2014; Zhen Ye leg. (NKUM) • 3 ♀♀ (apterous), China, Yunnan Province, Xi-shuang-ban-na Autonomous Prefecture, Jing-hong City, Meng-la County, Yao-qu-yao-zu Township; 21 ° 42 ' 57.0 " N, 101 ° 32 ' 32.2 " E; 758 m a. s. l.; 26 Jul. 2016; Zhen Ye leg. (NKUM) • 4 ♂♂, 3 ♀♀ (apterous), China, Yunnan Province, Xi-shuang-ban-na Autonomous Prefecture, Jing-hong City, Man-dian Village, Man-dian-pu-bu; 22 ° 7 ' 45.1 " N, 100 ° 40 ' 01.9 " E; 660 m a. s. l.; 20 Apr. 2023; Ze-zhong Jin and Zi-he Li leg. (NKUM) • 3 ♂♂, 2 ♀♀ (apterous), China, Yunnan Province, Pu-er City, Meng-lian County, Meng-ma Town, Mang-yun Village; 22 ° 13 ' 50.5 " N, 99 ° 21 ' 30.1 " E; 887 m a. s. l.; 20 Jul. 2016; Zhen Ye leg. (NKUM) • 2 ♂♂, 1 ♀ (apterous), China, Yunnan Province, Xi-shuang-ban-na Autonomous Prefecture, Jing-hong City, Pu-wen Town, Cai-yang-he; 22 ° 2 ' 43.2 " N, 100 ° 56 ' 10.3 " E; 25 Apr. 2011; Rui Wang leg. (NKUM) • 1 ♂ (apterous), China, Yunnan Province, Pu-er City, Si-mao District, Nan-dao-he; 22 ° 36 ' 45.9 " N, 100 ° 59 ' 46.6 " E; 990 m a. s. l.; 15 Jul. 2018; Juan-juan Yuan leg. (NKUM) • 1 ♂ (apterous), 1 ♀ (macropterous), China, Yunnan Province, Xi-shuang-ban-na Autonomous Prefecture, Jing-hong City, Nan-la County; 21 ° 44 ' 25.6 " N, 101 ° 18 ' 8.0 " E; 28 Apr. 2011; Rui Wang leg. (NKUM). Diagnosis. Color pattern as shown in Figs 2 H, I, 3 G, H, 12 H, I. Males: profemur incrassate (Fig. 6 H, I); ventral side of the profemur with two indistinct tufts of short setae on the apical 1 / 2 and an additional large, elongate crest of dark setae on basal 1 / 2 (Fig. 6 I), occasionally also with a tuft of short setae in the middle (Fig. 6 H); protibia slightly curved and with a distinct tumescence on basal 1 / 2 (Fig. 6 H, I); abdominal segment VIII relatively long (Fig. 7 G, H); in ventral view, pygophore posteriorly with a short knob-like median process, a pair of distinct angular lateral processes, and a pair of indistinct blunt processes between the median process and lateral processes (Figs 8 G, H, 9 G; H); median process of pygophore relatively broad in lateral view (Figs 10 G, H, 11 G, H); lateral arm of proctiger with an angular process laterally and basally curved in ventral view (Fig. 8 G, H), and in lateral view with a distinctly pointed subapical process (Fig. 10 G, H). Comparative notes. A. riparia is most similar to A. lyra (Paiva, 1918), see comparative notes in Polhemus and Tran (2012). Distribution. China: Yunnan (Fig. 18). Thailand; Laos; Vietnam; Peninsular Malaysia; Singapore (Polhemus and Tran 2012). Habitats. We observed A. riparia inhabiting the edges of streams with extremely slow water currents (Fig. 15 D), as well as on completely still ponds (Figs 15 C, 17 A – C). Remarks. Based on the reasons listed in the introduction, we believe that the “ A. lyra (Paiva, 1918) ” reported by Cheng et al. (2006) is actually A. riparia. Therefore, we conclude that A. lyra has not been recorded in China. The differences between A. riparia and A. lyra have been extensively discussed by Polhemus and Tran (2012). Moreover, Polhemus and Tran (2012) discovered specimens of A. riparia with a small tuft of setae in the middle of the profemora. These specimens were collected from northern Thailand and northern Vietnam, exhibiting genitalic segments correspond to A. riparia (Polhemus and Tran 2012). Additionally, the middle setae tufts of profemur also slightly differed from those of A. lyra (Polhemus and Tran 2012). We found several specimens with similar morphology characteristics in southern Yunnan (Figs 2 H, 3 G, 6 G, 7 G, 8 G, 9 G, 10 G, 11 G, 12 H), including a couple from Jinghong City and a male from Pu’er City. These specimens also have a small tuft of setae in the middle of the male profemora. The lateral process of the pygophore (Figs 8 G, 9 G) and the processes on the lateral arms of the proctiger (Fig. 10 g) both aligned more closely with those of A. riparia (see Polhemus and Andersen 1984: figs 77, 78; also see Polhemus and Tran 2012: fig. 4) rather than A. lyra (see Polhemus and Andersen 1984: figs 74, 75; also see Polhemus and Tran 2012: fig. 2). Given that we only found a few individuals and not a large population, we are more inclined to believe that these specimens belong to A. riparia, with the male profemur differences resulting from occasional mutations.