Chaetarthria saundersi d’ Orchymont, 1923

Jia, Fenglong, Wang, Shi-shuai & Aston, Paul, 2018, Revision of Chaetarthria Stephens (Coleoptera: Hydrophilidae) in China, with a key to the species in the Oriental Region, Journal of Natural History 52 (37 - 38), pp. 2369-2384 : 2370-2372

Chaetarthria saundersi d’ Orchymont, 1923

( Figures 1a–e and 6a–b )

Chaetarthria saundersi d’ Orchymont, 1923: 420 .

Specimens Hebauer (1995) recorded in ISNB and NHMW were checked.

Additional material examined

HONGKONG: 1 female ( PCPA): ‘ Lam Tsuen valley , Sheung Tin Liu Ha’ (= Shangtianliaoxia), ‘circa 50 m altitude in moss in watery mud, 2 .i .2012, Paul Aston leg’; 1 male, 2 unsexed spec. ( SYSU) : ‘Lantau, Tai O (= Da Ao), 40m altitude, thick moss on edge of narrow ditch with shallow stagnant water, 21 .i .2013 , Paul Aston leg’; 1 female ( PCPA): ‘ Lantau, Tai O’ (= Da Ao), ‘ 40m altitude, wet moss at edge of narrow ditch with shallow stagnant water, 10 .i .2012 , Paul Aston leg’; 1 male ( PCPA), 2 spec . ( SYSU): ‘ Lam Tsuen valley , Ng Tung Chai Village’ (= Wutong Village), ‘ 70 m altitude in moss at the edge of trickling stream’ (present with C. indica ), ‘ 19 .i .2013 , Paul Aston leg’; 1 male ( PCPA): ‘ Lantau, Tai O’ (= Da Ao), ‘ 40m altitude, thick wet moss at edge of narrow ditch with shallow stagnant water, 25 .iii .2012 , Paul Aston leg’; 2 male ( PCPA): ‘ Lantau, Tai O’ (= Da Ao), ‘ 40m altitude, thick wet moss at edge of narrow ditch with shallow stagnant water, 26 .xii .2012, Paul Aston leg’. HAINAN: 1 male ( SYSU): ‘ Wenchang, Tongguling Nature Reserve , 317m, light trap, 18 .iii .2008, Yang Yuxia leg’. (translated from Chinese). 1 female ( SYSU): ‘ Yinggeling Mt . light trap, 5 .iv .2008, Yuxia Yang leg .’ (trancribed from Chinese) . MACAU: 1 male ( SYSU): ‘ Cotai Ecological Reserve , 9 .x .2013, Fenglong Jia leg .’ (trancribed from Chinese) . JIANGXI: 1 spec . ( SYSU): ‘ Jing’ an County, Guanyinyan Scenic Area, 29.03N 115.25E, 20 .vii .2014, light trap, Ren-Chao Lin leg’. (with both Chinese and English data). YUNNAN: 1 male ( SYSU): ‘ Tropical Forest , Xishuangbanna Tropical Botanical Garden, 21.92°N, 101.27°E, 606m, 22 .xi .2017, light trap, Chen Kai et Liu Qingming leg’.

Differential diagnosis

This species can be distinguished from other known Oriental species by dorsum entirely black, labrum uniformly black. Pronotum with distinct anterior angles, posterior angles not acute ( Figure 1a ), lateral stria continued along anterior margin and distinctly curved behind eyes ( Figure 1e ). Elytra with almost regular series of punctures, intervals with coarser and more irregular punctures ( Figure 1d ), clearly deflected lateromedially, sutural striae reaching two-thirds anteriorly ( Figure 1d ), only narrowly yellow apically and posterolaterally ( Figure 1b,d ). Median lobe of aedeagus broad and round apically, parameres rounded apically ( Figure 6a,b ).

Distribution

Widely distributed from south-eastern Asia through Vietnam to Nepal ( Hansen 1999) and China (Hong Kong, Hainan, Macau, Jiangxi, Yunnan). First record for China ( Figure 7 ).

Figures

Figure 1. Chaetarthria saundersi d’Orchymont. (a–c) Habitus: (a) dorsal; (b) lateral; (c) ventral; (d) elytra; (e) pronotum, left.

Figure 6. Aedeagi. (a–b) Chaetarthria saundersi d’Orchymont: (a) from Hong Kong; (b) from Jiangxi. (c) Chaetarthria kuiyanae sp. nov; (d) Chaetarthria almorana Knisch; (e) Chaetarthria malickyi Hebauer; (f–h) Chaetarthria indica d’Orchymont: (f) from Jinggangshan, Jiangxi; (g) from Hong Kong; (h) from Jinggangshan, Jingxi.

Figure 7. Distribution of Chaetarthria species in China.