Chaetarthria indica d’ Orchymont, 1920

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 : 2379-2382

publication ID	https://doi.org/ 10.1080/00222933.2018.1532023
publication LSID	lsid:zoobank.org:pub:8C5C12EE-94C7-4928-B91C-0DE17440A7C9
persistent identifier	https://treatment.plazi.org/id/9D16053D-FFA1-FFF8-FE5D-FF5758CEF937
treatment provided by	Felipe
scientific name	Chaetarthria indica d’ Orchymont, 1920
status

Treatment

Chaetarthria indica d’ Orchymont, 1920 View in CoL

( Figures 5a–f View Figure 5 and 6f–h View Figure 6 )

Chaetarthria indica d’ Orchymont, 1920: 19 View in CoL .

Type material examined

2 male paratypes ( ISNB), Nilgiri Hills, coll . A . d’ Orchymont, A . d’ Orchymont det., Chaetarthria indica .

Additional material examined

Specimens in NMPC and all specimens Hebauer (1995) recorded in ISNB and NHMW were checked. HONG KONG: 2 males, 1 female ( PCPA): ‘ Lam Tsuen valley , Ng Tung Chai Village’ (= Wutong Village), ‘ 70 m altitude in moss at the edge of trickling stream’ (present with C. saundersi ), ‘ 19 .i .2013, Paul Aston leg’ .; 2 males, 3 females ( PCPA): ‘ Wu Kau Tang’ (= Wujiaoteng), ‘ 80 m altitude, moss above broken water pipe and in water seepage’ (note females had very large fat reserves), ‘ 7 .ii .2013, Paul Aston leg’ .; 8 spec . ( PCPA): ‘ Lam Tsuen valley , Tai Om Shan village, 180–220 m altitude in moss and leaf litter in stream, 18 .ii .2013 , Paul Aston leg’.; 1 spec . ( PCPA): ‘ Lantau , Pak King Au’ (= Bogong Ao) ‘ 300m stream edge 10 .vii .2012 , Paul Aston leg’.; 2 females ( PCPA): ‘ Wu Kau Tang’ (= Wujiaoteng), ‘ 80 m altitude, moss in water seepage, 22 .xii .2012, Paul Aston leg’ . JIANGXI: 17 spec . ( SYSU), ‘ Jinggangshan , Xiangzhou, 428m, 26 .iv .2011 , Fenglong Jia leg’.; 1 male: China ( NMPC), [ MF08 View Materials ], ‘ Jinggangshan Mts ., Xiangzhou (forested valley S of the village), 26°35.5´N 114°16.0´E, 374 m, 26 GoogleMaps .iv GoogleMaps .2011, FikáČek & Hájek, rice fields in the village [very shallow water with thick mud] & exposed stream in the village’. GUANGDONG: 1 male ( NMPC): [ MF16 View Materials ], ‘W of Qixing , 1–3 .v .2011, Heishiding nature reserve , 23°27.9´N 111°54.3´E, 190-260 m, FikáČek & Hájek, on wet rock on side of waterfall; directly in rock and under fallen leaves; in crevices; and on the roots of grasses growing on the rock face’; 1 male ( SYSU): ‘ Heishiding nature reserve, Fengkai county, 190–260 m, 20 GoogleMaps .xi GoogleMaps .2010, Fenglong Jia leg’; 1 male ( SYSU): ‘ Wutongshan , Hengpailing, Shenzhen, 15 .v .2011, Fenglong Jia leg’ . YUNNAN: 1 male, 3 female ( SHNU): ‘ Kilometer 55, Xishuangbanna, 8 . vii .2003, Hu & Tang leg’.

Differential diagnosis

Very close to C. almorana Knisch, 1924 ; C. kuiyanae sp. nov. but can be distinguished from C. almorana in having median lobe of aedeagus truncate anteriorly ( Figure 6f–h View Figure 6 ), with a flagellum arising out of the middle of the anterior margin (occasionally the flagellum is absent, perhaps broken off; Figure 6h View Figure 6 ), not flanked by heavily chitinised endosclerites apically; and from C. kuiyanae sp. nov. by median lobe much shorter than parameres, c. 1.2× as wide as one paramere, not protruding anteromedially, lateral margin rounded at basal half, gonopore of the transverse linear form.

Distribution

Widely distributed from south-eastern Asia through Vietnam to India and China ( Hansen 1999; FikáČek et al. 2015). First record for Guangdong, Jiangxi and Yunnan Provinces ( Figure 7 View Figure 7 ).

A Key to the Oriental species of Chaetarthria Stephens, 1835

1. Pronotum with distinct anterior angles, anterolateral margin not thicker than lateral margins, posterior angles not acute ( Figure 1a,e View Figure 1 ). Lateral stria of pronotum continued far along anterior margin and distinctly curved behind eyes ( Figure 1e View Figure 1 ). Elytra clearly deflected lateromedially ( C. saundersi group).

Elytra with 10 somewhat regular rows of coarse punctures that become regular apically, punctures on intervals distinct, more or less irregular ( Figure 1b,d View Figure 1 ). Sutural striae reaching anterior two-thirds ( Figure 1d View Figure 1 )...... ...... C. saundersi Orchymont, 1923

- Pronotum without distinct anterolateral angles ( Figures 2a View Figure 2 , 5d View Figure 5 ), anterolateral margin thicker than lateral margins ( Figures 2e View Figure 2 , 3g View Figure 3 , 5e View Figure 5 ), posterolateral angles acute ( Figure 5d View Figure 5 ). Lateral striae of pronotum continued only a short distance along anterior margin and not curved ( Figures 2e View Figure 2 , 4f View Figure 4 , 5e View Figure 5 ) ( C. indica group).

Elytra almost devoid of punctures except two irregular punctured series ( Figures 2d View Figure 2 , 5c View Figure 5 ) or with 10 rows of punctures ( Figure 3c View Figure 3 ). Sutural stria reaching half the length of the elytra ( Figure 3c,i View Figure 3 ) ........................................................................................................................ 2

2. Elytra with 4 distinct series of systematic punctures, each interval with 2 series of distinct irregular punctures, lateral portion with irregular larger punctures................... ........................................................................................................................................... Chaetartria sp. Elytra at most with more or less distinct series of systematic punctures and indistinct irregular punctures on lateral and apical portions................................................................ 3

3. Elytra with a large dark yellowish patch mediobasally ( Figure 4a,e View Figure 4 ), and a large yellow patch apically covering at least one-fifth of the elytral length and broadly extends to at least the middle of lateral margin ( Figure 4e View Figure 4 )................. ................. C. malickyi Hebauer, 1995 Elytra without a large yellowish patch mediobasally, only with narrow yellow lateral margin extending apically, apical yellow patch narrow ( Figures 1d View Figure 1 , 2d View Figure 2 , 3c,3i View Figure 3 , 5c View Figure 5 ) ............ 4

4. Aedeagus with median lobe strongly emarginated, flanked by heavily chitinised endosclerites ( Figure 6d View Figure 6 ), without a flagellum arising out of the middle of anterior margin...................................................................................................... C. almorana Knisch, 1924 Aedeagus with median lobe not emarginate anteriorly, without heavily chitinised endosclerites, with a flagellum arising out of the middle of anterior margin ( Figure 6c, f,g View Figure 6 ) ....................................................................................................................................................................... 5

5. Median lobe of aedeagus c. 2× as broad as one paramere medially, apex protruding to base of flagellum, sides subparallel from base to anterior fifth, a little shorter than parameres, gonopore large, transversely sub-oval ( Figure 6c View Figure 6 )....... ....... C. kuiyanae sp. nov. Median lobe of aedeagus c. 1.2× as broad as one paramere medially, truncate apically, clearly broadened on basal half, distinctly shorter than paramere, gonopore of the linear form ( Figure 6f–h View Figure 6 ).............................................. C. indica d’ Orchymont, 1920