Review Article |
Corresponding author: Ling-Xiao Chang ( lx_chang@hotmail.com ) Corresponding author: Guo-Dong Ren ( gdren@hbu.edu.cn ) Academic editor: Janakiraman Poorani
© 2020 Ling-Xiao Chang, Wen-Xuan Bi, Guo-Dong Ren.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Chang L-X, Bi W-X, Ren G-D (2020) A review of the genus Sinocymbachus Strohecker & Chûjô with description of four new species (Coleoptera, Endomychidae). ZooKeys 936: 77-109. https://doi.org/10.3897/zookeys.936.48577
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This work presents a review of species of the Asian genus Sinocymbachus Strohecker & Chûjô, 1970. Four new species are described from China: S. fanjingshanensis Chang & Bi, sp. nov., S. longipennis Chang & Bi, sp. nov., S. sinicus Chang & Bi, sp. nov., and S. wangyinjiei Chang & Bi, sp. nov. Cymbachus koreanus Chûjô & Lee, 1993 is transferred to Sinocymbachus as S. koreanus (Chûjô & Lee) comb. nov. Sinocymbachus bimaculatus (Pic, 1927) is reported for the first time from China. The male of S. parvimaculatus (Mader, 1938) is discovered and described for the first time. Illustration, diagnosis and distribution are provided for each species. Prior to the present study, Sinocymbachus included ten species. An updated key to the species of Sinocymbachus is given.
Coleoptera, Endomychidae, new species, taxonomy
The genus Sinocymbachus is exclusively known in Southeast Asia and was established by
Apart from Engonius excisipes,
Prior to the present study, Sinocymbachus included ten species (
Type specimens of the new species described here and examined specimens are deposited in the following institutions and private collections:
CBWX Collection of Wen-Xuan Bi, Shanghai, China
CCCC Collection of Chang-Chin Chen, Tianjin, China
CCLX Collection of Ling-Xiao Chang, Beijing, China
MHBU Museum of Heibei University, Baoding, China
SHNU Shanghai Normal University, China, Shanghai
The specimens were examined, dissected, and measured using a Olympus SZX10 dissecting microscope. The measurements are standardised as follows: body length from the apical margin of the clypeus to the apex of the elytra; body width across both elytra at widest part; pronotal length from anterior angle to posterior margin; elytral length along the suture, including the scutellum. After observation, the dissected parts were mounted on the same card with the specimen. The abdomen was boiled in 10% NaOH solution, cleaned, and the aedeagus was dissected in distilled water. Habitus photographs were taken using a Canon EOS 5D III SLR camera and Canon MP-E 65 mm macro lens, and an Olympus OM-D E-M1 camera and Olympus ED 60 mm macro lens. Photographs of male genitalia and aedeagi were taken using a Canon EOS 5D III SLR camera and Canon MP-E 6 5mm macro lens. All photographs were refined in Adobe Photoshop CC 2015.
Sinocymbachus Strohecker & Chûjô, 1970: 511.
Engonius excisipes Strohecker, 1943.
The species of Sinocymbachus appear to be closely related to Cymbachus. However, Sinocymbachus can be distinguished from Cymbachus in having the body more elongate in most cases (except S. parvimaculatus and S. sinicus sp. nov.); intercoxal process of mesoventrite distinctly longer than wide (except S. parvimaculatus and S. sinicus sp. nov.), and with median ridge or tubercle at base; mesotibiae sexually dimorphic, toothed and excised on inner edge in male, straight in female (modified based on
There is distinct sexual dimorphism in the species of the genus Sinocymbachus. The species of the genus Sinocymbachus bear distinct characters of sexual dimorphism. The mesotibiae of males usually have variously developed teeth and excisions. Besides, median lobe of the aedeagus is usually less complicated apically in the species with teeth and excisions symmetric on mesotibiae while it is more complicated in the species with teeth and excisions placed asymmetrically on tibiae and usually have a wide concavity on the ventral side of antenna. However, there are also exceptions. For example, the median lobe is complicated in the males of S. excisipes with symmetric teeth and excisions on mesotibiae while there is a wide concavity on the ventral surface of antenna in the males of S. humerosus with symmetrically placed teeth and excisions on mesotibiae.
Holotype. Male, China: Guizhou Province: Jiangkou, Fanjingshan, 1775 m, 23–27.VII.2016, Yu-Tang Wang leg. (SHNU); Paratypes. 1 male, 1 female, Jiangkou, Fanjingshan, 1775 m, 11.VII.2009, Wen-Hsin Lin leg. (CCCC).
The name refers to the type locality.
Sinocymbachus fanjingshanensis sp. nov. is most similar to S. angustefasciatus, S. longipennis sp. nov., S. quadriundulatus and S. wangyinjiei sp. nov. in appearance. However, S. fanjingshanensis sp. nov. differs from S. angustefasciatus by the shiny body (vs. body opaque); left mesotibia in male widely excised (vs. not excised); from S. longipennis sp. nov. by the body dark brown, shiny (vs. black, opaque); elytra oval with sides curved (vs. long oval, weakly curved); right mesotibia in male not excised (vs. with shallow and weakly undulate excision); from S. quadriundulatus by the body without cupreous sheen (vs. with cupreous sheen); left mesotibia in male widely excised (vs. not excised); from S. wangyinjiei sp. nov. by the mesoventral process with anterior and posterior margins nearly equally wide (vs. anterior margin much wider than posterior); mesotibia in male with shallow but broad excision (vs. with deep and narrow excision).
Length 9.7–10.9 mm. Body oval, approximately 1.9–2.0 times as long as wide; convex; shiny. Colour dark brown, shiny, with four irregular orange transverse maculae on the elytra.
Head. Antenna (Fig.
Thorax. Pronotum 2.4–2.9 mm long, 3.5–3.8 mm wide; widest near 1/2 of pronotal length; rather coarsely and densely punctate; lateral and anterior margins narrowly bordered; anterior edge with large stridulatory membrane; sides undulate, deeply emarginate near basal 1/4; anterior angles produced, bluntly rounded; posterior angles acutely produced; disc weakly convex; median furrow absent; lateral sulci distinct, linear, extending to 1/3 of pronotal length; basal sulcus weakly sinuate, moderately deep. Prosternal process (Fig.
Abdomen. Ventrite 1 almost as long as two subsequent ventrites combined; ventrites 2–4 subequal in length. Ventrite 5 with lateral margin gradually converging posteriorly; posterior margin broadly rounded medially in male (Fig.
China: Guizhou.
Holotype. Male, China: Yunnan Province: male, Gongshan, Dabadi, 2840 m, 14.VI.2015, Wen-Xuan Bi leg. (SHNU); Paratypes. 1 male, 1 female, same data as holotype (CBWX); 1 female, Gongshan, Sendang-Dabadi, 2840 m, 20.VI.2015, Wen-Xuan Bi leg. (CBWX); 1 male, Diqing, Weixi, Badi, Nanjieluo, 2921 m, 29.VI.2014, Xiao-Dong Yang leg. (CCCC); 5 males, Dayao County, Santai Township, Xiaobaicaoling, 29–30.V.2013, 2980 m Wen-Xuan Bi leg. (CBWX); 1 male, Binchuan County, Jizushan, 2400 m, 18.VII.2010, Liang Tang leg. (CBWX); Sichuan Province: Shimian County, alt. 2580 m, 5.VIII.2016, Ai-Min Shi, Yan-Hong Li leg. (MHBU); 9 males, Puge County, Luobinshan Cableway Station (downhill exit), alt. 2500 m, light trap, 9.VI.2012, Gan-Yan Yang leg. (
The name refers to the distinctly elongate elytra, especially in male.
Sinocymbachus longipennis sp. nov. is most similar to S. angustefasciatus, S. fanjingshanensis sp. nov., S. quadriundulatus and S. wangyinjiei sp. nov. in external appearance. However, the distinctly more elongate elytra (especially in males) with nearly parallel sides can separate it from all these similar species. In addition, S. longipennis sp. nov. differs from S. angustefasciatus by having the elytra widest in the middle length (vs. behind middle); left mesotibia in male widely excised (vs. not widely excised); from S. fanjingshanensis sp. nov. by the body black and opaque (vs. dark brown, shiny); right mesotibia in male with shallow and weakly undulate excision (vs. not excised); from S. quadriundulatus by the body without cupreous sheen (vs. with cupreous sheen); left mesotibia in male widely excised (vs. not widely excised); from S. wangyinjiei sp. nov. by the body black and opaque (vs. dark brown, shiny); mesotibia in male with shallow and nearly straight excision (vs. with deeply U-shaped excision).
Length 9.5–10.6 mm. Body long and oval, 1.8 times as long as wide; convex; shiny. Colour black with four orange irregular maculae on elytra, narrow and transverse.
Head. Antenna (Fig.
Thorax. Pronotum 2.3–2.8 mm long, 3.2–3.5 mm wide; widest at base; coarsely and rather densely punctate; lateral and anterior margins narrowly bordered; anterior edge with moderately large stridulatory membrane; sides undulate, deeply emarginate near basal 1/3 length; anterior angles produced, bluntly rounded; posterior angles acutely produced; disc weakly convex; median furrow absent; lateral sulci distinct, linear, extending to 1/3 of pronotal length; basal sulcus weakly sinuate, moderately deep. Prosternal process (Fig.
Abdomen. Ventrite 1 almost as long as subsequent two ventrites combined; ventrites 2–4 subequal in length. Ventrite 5 with lateral margin gradually converging posteriorly; posterior margin broadly rounded in male (Fig.
China: Yunnan and Sichuan.
Holotype. Male, China: Xizang Province: Motuo, Baricun, 1700 m, 7.VIII.2014, Wen-Xuan Bi leg. (SHEM); Paratypes. 1 male, 1 female same data as holotype (CCLX); 1 male ditto except (CBWX); 1 female, Motuo, 1900 m, 20.VIII.2013, Wen-Xuan Bi leg. (CBWX); 2 females, Xizang, Linzhi, Motuo, 1559 m, 2016.VIII.5, Xiao-Dong Yang leg. (CCCC); 1 male, 1 female, Linzhi, Motuo, 1526 m, 2016.VIII.21, Xiao-Dong Yang leg. (CCCC); 1 male, ditto except 2016.VIII.23 (CCCC); 1 male, Yunnan Province: Gongshan, Dulongjiang, Maku, 1250 m, Wen-Xuan Bi leg. (CBWX).
The name is dedicated to our country which has created good research environment for us.
Sinocymbachus sinicus can be separated from all its congeners by having the body short oval and each elytron with two transverse maculae, more regular without distinct projections.
Length 8.9–9.1 mm. Body short oval, approximately 1.3 times as long as wide; moderately convex; smooth. Colour black with four orange irregular transverse maculae on elytra.
Head. Antenna (Fig.
Thorax. Pronotum 2.3–2.4 mm long, 3.5–3.9 mm wide; widest near 1/2 of pronotal length; coarsely and rather densely punctate; lateral and anterior margins narrowly bordered; anterior edge with moderately large stridulatory membrane; sides nearly parallel; anterior angles produced, bluntly rounded; posterior angles moderately acutely produced; disc weakly convex; two round raised areas laterally; inflexed laterally; median furrow absent; lateral sulci very short and deep, in form of triangular dent; basal sulcus weakly curved, moderately deep. Prosternal process (Fig.
Abdomen. Ventrite 1 longer than 2 and 3 combined; ventrites 2–4 subequal in length. Ventrite 5 (Fig.
China: Xizang and Yunnan.
Holotype. Male, China: Hubei Province: Shennongjia, 1635 m, 4.X.2007, Yin-Jie Wang leg. (SHNU).
The name is dedicated to Mr. Yin-Jie Wang, who collected the holotype of this species for our study.
Sinocymbachus wangyinjiei sp. nov. resembles S. angustefasciatus, S. fanjingshanensis sp. nov., S. longipennis sp. nov., and S. quadriundulatus. However, it can be differentiated from S. angustefasciatus by the body shiny (vs. opaque); mesotibia in male with deeply U-shaped excision (vs. not excised); from S. fanjingshanensis sp. nov. by the anterior margin of mesoventral process much wider than posterior margin (vs. anterior margin as wide as posterior margin); mesotibia in male with deep and narrow excision (vs. with shallow and wide excision); from S. longipennis sp. nov. by the body dark brown and shiny (vs. black, opaque); elytra oval with sides distinctly curved (vs. long oval, nearly parallel); mesotibia in male with deep and narrow excision (vs. with shallow and wide excision); from S. quadriundulatus by the body without cupreous sheen (vs. with cupreous sheen); mesotibia in male with deeply U-shaped excision (vs. not excised).
Length 9.7 mm. Body oval, approximately 2.1 times as long as wide; convex; shiny. Colour black, shiny, with four orange irregular transverse maculae on elytra.
Head. Antenna (Fig.
Thorax. Pronotum 2.1 mm long, 3.2 mm wide; widest at base; rather coarsely and densely punctate; lateral and anterior margins narrowly bordered; anterior edge with large stridulatory membrane; sides undulate, deeply emarginate near basal 1/4 length; anterior angles bluntly produced; posterior angles acutely produced; disc weakly convex; median furrow absent; lateral sulci short and deep, in form of triangular dent; basal sulcus sinuate, moderately deep. Prosternal process (Fig.
Abdomen.
Ventrite 1 almost as long as two subsequent ventrites combined; ventrites 2–4 subequal in length. Ventrite 5 (Fig.
China: Hubei.
Engonius angustefasciatus Pic, 1940: 11.
Sinocymbachus angustefasciatus:
Sinocymbachus angustefasciatus is most similar to S. fanjingshanensis sp. nov., S. longipennis sp. nov., S. quadriundulatus and S. wangyinjiei sp. nov. by having transverse elytral maculae. However, S. angustefasciatus differs from S. fanjingshanensis sp. nov. by the body opaque (vs. body shiny); left mesotibia in male not excised (vs. widely excised); from S. longipennis sp. nov. by the oval elytra with sides distinctly curved (vs. long oval, nearly parallel); left mesotibia in male not excised (vs. widely excised); from S. quadriundulatus by the body opaque (vs. body shiny); mesotibial tooth in male symmetric (vs. asymmetric); from S. wangyinjiei sp. nov. in having the body opaque (vs. body shiny); mesotibia in male not excised (vs. deeply excised).
9.2–10.6 mm; width: 4.9 mm.
China: Sichuan Province. Qingchuan County, 13.VII.2013, Jun-Xia Zhang leg. (1 female, MHBU); Wolong Nature Reserve, 18.VII.2013, Yun-Xia Zhang leg. (1 female, MHBU); Wolong, 6–8.VIII.2004, Xiu-Juan Yang & Hui-Ran Hua leg. (2 males, MHBU); Kangding, Pengta, 28.VIII.2005, Fu-Ming Shi leg. (10 males, MHBU); ditto except 29.VIII.2005 (17 males, MHBU); ditto except 30.VIII.2005 (5 males, MHBU); ditto except 31.VIII.2005 (7 males MHBU); ditto except 1.IX.2005 (24 males, MHBU); Yajiang, Decha, 7.IX.2005, Fu-Ming Shi leg. (2 males, MHBU); Jiulong, Hongba, 23.IX.2008, Fu-Ming Shi leg. (1 male, MHBU); ditto except 25.IX.2008 (1 female, MHBU); Kangding, alt. 2624 m, 31.VII.2010, Fu-Ming Shi & Yong-Sheng Pan leg. (1 male, MHBU); Shimian Conty, Liziping, 13.VIII.2010, Fu-Ming Shi leg. (2 males, MHBU); Baoxing Country, Ganyanggou, 30°24'N, 102°38'E, alt. 2000 m, 28.VI.2012, Huang Hao leg. (1 female, SHNU); Shimian Country, Liziping, 28°55'N, 102°13'E, alt. 2600 m, 15.VII.2012, Peng, Dai & Yin leg. (1 female, SHNU);Shimian Country, Caoke Township, Tuanjie Village, 25.VIII.2016, Jian-Yue Qiu & Hao Xu leg. (1 male, CCLX); Fengtongzhai, Mahuanggou, 30.VII.2016, Cai-Xia Yuan leg. (1 female, MHBU); ditto except 31.VII.2016 (2 males, 2 females, MHBU); Liziping, Zimaping, 31.VII.2016, Cai-Xia Yuan et al. leg. (1 female, MHBU); Kangding, 2500–2700 m, 18.VIII.2014, Wen-Xuan Bi leg. (6 males, 9 females, CBWX); Tianquan County, Labahe, 2060 m, 28–30.VII.2007, Liu, Zhang, Zhou & Bi leg. (2 males, 1 female, CBWX); Emeishan, Huayanding, 1914 m, 15.VIII.2011, Hao Huang leg. (1 male, CCCC); Baoxing, Jiajinshan, Mahuanggou, 27.VI.2012, Xiao-Dong Yang leg. (1 male, CCCC); Yunnan Province: Yiliang, Xiaocaoba, 24.VIII.2013, Xun Bian & Guang-Lin Xie leg. (1 male, MHBU); Chongzhou, Jiguanshan, Shaoyaogou, 29.V.2016, Fu-Ming Shi leg. (3 males, 1 female, MHBU); ditto except 31.V.2016 (5 males, MHBU); Shimian, Liziping Protection Station, Gongyihai Station, Liu et al. leg. (1 male, SHEM 24348709); Tianquan County, Labahe, alt. 2100 m, 28–30.VII.2007, Liu et al. leg. (1 female, SHEM24348710); ditto except (1 male, SHEM24348711); ditto except (1 male, SHEM24348712); Shimian Hsien, Liziping N.R., Gongyihai Refuge, 29°01'30.76"N, 102°23'05.11"E, 2056 m, mixed leaf litter, sifted, 25.VII.2016, Zhou, Jiang, Liu & Gao leg. (3 males, 4 females, SHNU); Shimian Hsien, Liziping N.R., Gongyihai-Mamadi, 28°59'24.55"N, 102°24'33.92"E, 2056–2615m, 24.VII.2016, Zhou, Jiang, Liu & Gao leg. (3 males, 2 females, SHNU); Baoxing Hsien, Fengtongzhai N.R., Dashuigou, 30°34'21.95"N, 102°52'54.92"E, 1594 m, 31.VII.2016, Zhou, Jiang, Liu & Gao leg. (1 male, SHNU); Shaanxi Province: Ningshan, Pingheliang, 33.479148N, 108.491827E, alt. 2388m, 15.VIII.2013, Xi-Chao Zhu & Ying Tian leg. (2 males, MHBU); Liuba, Caishenmiao, 33°43'27.0"N, 107°12'11.1"E, alt. 1212m, 17.VIII.2013, Xi-Chao Zhu & Ying Tian leg. (1 female, MHBU).
China: Sichuan. First records from Yunnan and Shaanxi Provinces of China.
Amphisternus bimaculatus Pic, 1927: 11.
Cymbachus bimaculatus:
Sinocymbachus bimaculatus:
Sinocymbachus bimaculatus is most similar to S. humerosus in appearance, sharing two round maculae on each elytron. However, S. bimaculatus differs from S. humerosus by the scutellum (Fig.
8.0–9.7 mm; width: 5.1–5.8 mm.
China: Guizhou Province: Xishui, Dabaitang, 25–29.IX.2000, Guo-Dong Ren leg. (1 female, MHBU); ditto except 30.IX.2000 (1 female, MHBU); Yanhe County, Mayanghe, Maojia Village, 5–12.VI.2007, Feng-Yan Wang leg. (2 females, MHBU); Fenghuangshan Mt., 27°42'N, 106°55'E, alt. 900 m, 6.III.2012, LI Runyu leg. (1 female, SHNU); Libo Hsien, Maolan N.R., 25°16'38"N, 107°55'29"E, mixed leaf litter, sifted, 800 m, 19.VII.2015, Chen, He, Hu, Wang & Zhao leg. (1 male, 1 female, SHNU); Guangxi Province: Shangsi County, Hongqi, 29.XI.2001, Xiu-Juan Yang & Ai-Min Shi leg. (1 female, MHBU); Longsheng County, Huaping, 15.X.2005, Ji-Liang Wang & Chao Gao leg. (1 female, MHBU); Huanjiang County, Yangmeiao Protection Station, 15.VIII.2016, Ling-Xiao Chang leg. (4 males, 1 female, MHBU); Lin’gui Country, Huaping N.R., Anjiangping, alt. 1200 m, 13.VII.2011, He W.-J. & Tang L. leg. (1 female, SHNU); Hechi City, Mulun N.R., 25°8'54"N, 108°2'37"E, mixed leaf litter, sifted, 350–450m, 24.VII.2015, Chen et al. leg. (1 male, 1 female, SHNU); Huanjiang, Jiuwanshan, Yangmeiao, 1200 m, 18.VII.2015, light, Liu & Zhu leg. (1 male, SHEM24344878); Jinxiu, Changtanhe, 860 m, 15.VII.2014, Xiao-Bin Song leg. (1 male, CBWX); Maoershan, Lijiangyuan, 810 m, 28.VII.2014, Xiao-Bin Song leg. (2 females, CBWX); Jinxiu, Houzishan, 960 m, 13.VII.2014, Xiao-Bin Song leg. (1 male, CBWX); Sichuan Province: Luzhou, Huangjing, 20.VII.2002, Ming Bai & Jian-Feng Wang leg. (1 female, MHBU); Hunan Province: Zhangjiajie, Sangzhi, Guandiping, day, 16.VII.2010, Hao Xu leg. (1 male, MHBU); ditto except 28.VII.2010 (6 females, MHBU); Anhua County, Liubu, 16–17.VII.2004, Ji-Liang Wang leg. (1 male, MHBU); Tongdao County, Mujiao, 25.VII.2004, Jiang-Feng Wang & Ji-Liang Wang leg. (1 male, 1 female MHBU); Yongshun County, Xiaoxi, 8.VIII.2004, Ji-Liang Wang leg. (1 male, 1 female, MHBU); Yueyang City, Pingjiang County, Fushoushan, 28°28'N, 113°46'E. 1079 m, 18-26.VII.2016, Jiang-Jiang Liu & Zhou leg. (1 female, SHNU); Dongan County, Damiaokou Town, Shunhuangshan Park, Ehuangxi, 8.X.2015, Chi Jin leg. (CCLX); Zhejiang Province: Quzhou City, Jiangshan County, Shuangxikou, 27°55'02.72"N, 119°11'34.47"E, alt. 496 m, mixed leaf litter, sifted, 12.VIII.2018, Cheng & Miao leg. (1 female, SHNU); Kaihua, Gutianshan, 500–850 m, 21.IV.2013, Xiao-Bin Song leg. (5 males, 5 females, CBWX); Fujian Province: Wuyishan, Taohuayu, 9.VI.2013, Chi Jin & Jie Yang leg. (1 male, MHBU); Jianning, Jinraoshan, 12.VI.1956, Gen-Tao Jin & Yang-Ming Lin leg. (1 female, SHEM24295200); ditto except (1 male, SHEM24295201); ditto except (1 female, SHEM24295202); ditto except (1 male, SHEM24295203); ditto except (1 female, SHEM24295204); ditto except (1 male, SHEM24295205); ditto except (1 female, SHEM24295207); ditto except (1 male, SHEM24295208); ditto except (1 female, SHEM24295209); ditto except (1 male, SHEM24295210); ditto except (1 female, SHEM24295211); ditto except (1 female, SHEM24295212); ditto except (1 female, SHEM24295213); ditto except (1 female, SHEM24295214); ditto except (1 female, SHEM24295216); ditto except (1 female, SHEM24295223); ditto except (1 male, SHEM24295226); ditto except (1 female, SHEM24295228); ditto except (1 female, SHEM24295229); ditto except (1 female, SHEM24295199); Nanping City, Mangdangshan Mt., 26°41'51"N, 118°07'00"E, mixed forest, leaf litter, sifted, 400 m, 10.XI.2015, Yan & Tang leg. (1 female, SHNU); Guangdong Prvince: Nanling, 8.V.2008, Hong-Liang Shi leg. (2 males, 1 female, MHBU); Lianxian, Dadongshan, 28.V.1997 Chen Hong leg. (1 female, SYSU En-131910); Lianxian, Dadongshan, 3.IX.1994 Chang-Ping Zhao leg. (1 female, SYSU En-131911); Lianzhou City, Dadongshan, 2.VI.1998 Han Zhang leg. (1 female, SYSU En-131912); Lianxian, Dadongshan, 27.V.1997 Xiao-Xin Zhang leg. (1 female, SYSU En-131913); ditto except Ji Zheng leg. (1 female, SYSU En-131915); ditto except, 28.V.1997 Jian-Hua Li leg. (1 male, SYSU En-131916); Fengkai, Heishiding, 3.VII.1986, Zhen-Ao Chen leg. (1 female, SYSU En-131928); Hainan Province: Ledong Country, Jianfengling, Mingfenggu, 18°44'N, 108°50'E, alt. 950m, 30.IV.2012, PENG & DAI leg. (1 female, SHNU); Qiongzhong Country, Limushan, 1160 m, 4.IV.2016, Ling-Xiao Chang & Xing-Long Bai leg. (1 female, CCLX).
Vietnam: Tonkin. China (new country record): Guizhou, Guangxi, Sichuan, Hunan, Zhejiang, Fujian, Guangdong and Hainan.
The adults were collected by shaking the tree from a large clump of dead wood of Fagaceae plants (Mt. Limushan, Qiongzhong, Hainan) (Fig.
Habitats of Sinocymbachus bimaculatus A, E adult of S. bimaculatus B large clump of Fagaceae plants at collection site in Hainan, China C clusters of mature larvae, prepupae or pupae of S. bimaculatus, with newly emerged adults, beneath the tree trunk D search for Endomychidae from large pile of dead bamboos in Guangxi, China.
Sinocymbachus decorus Strohecker & Chûjô, 1970: 516.
Sinocymbachus decorus is most similar to S. luteomaculatus and S. politus in appearance: elytra in both species have two basal spots and one narrow transverse apical band. However, S. decorus differs from S. luteomaculatus by having a shiny body (vs. body opaque); humeri roundly subcarinate, prominent (vs. weakly prominent); from S. politus by the body without cupreous sheen (vs. with cupreous sheen); two basal elytral maculae arranged in oblique line (vs. spots arranged in horizontal line); mesotibial tooth in male asymmetric (vs. symmetric).
10.4–10.6 mm; width: 5.1–5.5 mm.
China: Yunnan Province: Lincang, Wulaoshan Forest Farm, 23°54'36.4"N, 100°11'04.3"E, alt. 2371 m, 8–10.VII.2009, Ji-Shan Xu & Li-Xiang Zhang leg. (2 females, MHBU); Lincang, Wulaoshan Forest Farm, Qingrengu, 25.VIII.2019 D, Ling-Xiao Chang leg. (1 male, 1 female, CCLX); Yun County, Yongbao Town, Pinghe Reservoir, X.2018, Zi-Chun Xiong leg. (1 male, 1 female, CCLX); Jingdong County, Ailaoshan, 7–9.VIII.2009, Ji-Shan Xu & Zhong-Kun Li leg. (1 male, MHBU); Lushui, Yaojiaping, 2700 m, 21.VI.2010, Wen-Xuan Bi leg. (2 males, CBWX); ditto except 2450 m, 4.V.2015 (2 males, 1 female, CBWX); ditto except 13.VIII.2015 (1 male, 1 female, CBWX); ditto except 2450–2700 m, 14.IV.2018 (1 male, 1 female, CBWX); ditto except 2500 m, 15.IX.2018 (1 male, CBWX); Lushui, Pianma, Gangfang, 2100 m, 7.VI.2015, Wen-Xuan Bi leg. (1 male, CBWX); Dayao County, Santai Town, Xiaobaicaoling, 2980 m, 29–30.V.2013, Wen-Xuan Bi leg. (1 female, CBWX); Nanjian Sheyaojing, 2450 m, 11.VII.2017 em VII.21, Wen-Xuan Bi leg. (1 female, CBWX); Tengchong, Houqiao, Heinitang, 11–14.IX.2018, Wen-Xuan Bi leg. (2 females, CBWX); Gongshan, Shaunglawa, 1650 m, 17.VI.2015, Wen-Xuan Bi leg. (1 female, CBWX).
China: Yunnan.
The adults were collected from dead leaves of Fagaceae plants by shaking the tree (Mt. Wulaoshan, Lincang, Yunnan).
Engonius excisipes Strohecker, 1943: 383.
Cymbachus excisipes:
Sinocymbachus excisipes:
Sinocymbachus excisipes can be separated from all its congeners by having the intercoxal process of mesoventrite with large tubercle instead of short medina ridge at base; ventrite 5 with posterior margin abruptly projecting medially in male. Furthermore, the basal and apical elytral maculae varied in different specimens - they may be composed of 2–4 small spots, or form transverse bands with strong dentations/projections (Fig.
9.5–10.9 mm; width:6.0–6.2 mm.
China: Zhejiang Province. Tianmushan, 370–1100 m, 5.VIII.1962, Gen-Tao Jin leg. (1 female, SHEM 24343460); Longquan, Fengyangshan, 1926 m, 29.VI.2015, Liu et al. leg. (1 male, SHEM 24345681); Tianmushan, 11–14.VIII.1987, Wu Wu leg. (1 female, SYSU En-096206); Linan, Xitianmushan, 1100 m, 1–9.VII.2006, Wen-Xuan Bi leg. (1 male, 1 female, CBWX); ditto except 29.VI–1.VII.2007 (1 male, CBWX); ditto except 1100–1050 m, 14.VII.2016 (3 males, 3 females, CBWX); ditto except 10-16.VII.2018 (48 males, 24 females, CBWX); Hunan Province: Sangzhi County, near Tianpingshan Control Station, 15.IX.2015, Chi Jin leg. (1 male, CCLX); Yichang City, Wufeng Hsien, Houhe N. R., 3.VIII.2013, Hao Huang leg. (1 female, SHNU); Chongqing Province: Qianjiang District, Shuishicun, 8.VII.2011, Qiang Guo leg. (1 male, MHBU); Guizhou Province: Daozhen, Dashahe, 24.VIII.2004, Fu-Ming Shi leg. (1 female, MHBU); Sichuan Province: Emeishan, alt. 890 m, 28.VI.2009, Yu-Ting Chen leg. (2 females, MHBU); Emeishan, Leiyinsi, 11.VIII.2011, Fu-Ming Shi & Le-Hong Zhao leg. (1 male, MHBU); Eemeishan, Xixinsuo, 1400 m, 28.VI.2018, Wen-Xuan Bi leg. (1 female, CBWX); Wolong, 6–8.VIII.2004, Xiu-Juan Yang & Hui-Ran Hua leg. (3 males, 3 females, MHBU); Dujiangyan, Qingchengshan, 11–12.VIII.2004, Xiu-Juan Yang & Hui-Ran Hua leg. (1 female, MHBU); Guangxi Province: Jinxiu, Dayaoshan, Pingbanshan, 1150 m, 18.VII.2016, Jin-Teng Zhao leg. (2 females, CBWX); Fujian Province: Wuyishan, 541 m, VI.2018, leg. Zhu-Qing He (1 male, CBWX).
China: Sichuan, Hubei. First records from Zhejiang, Hunan, Chongqing, Guizhou, and Guangxi Provinces of China.
Cymbachus humerosus Mader, 1938: 40.
Amphisternus quadrinotatus Chûjô, 1938: 396.
Sinocymbachus humerosus:
Sinocymbachus humerosus is most similar to S. bimaculatus in sharing two round maculae on each elytron. However, S. humerosus differs from S. bimaculatus by having the scutellum (Fig.
8.4–8.9 mm; width: 4.7–5.3 mm.
China: Zhejiang Province: Linan, Dajingwu, 9.VI.2012, Ling-Xiao Chang leg. (1 male, MHBU); Suichang County, Jiulongshan Reserve, Yanping, alt. 700–800 m, 12.X.2008, Jun-Hao Huang leg. (3 males, 3 females, MHBU); Longquan, Fengyangshan, 19.VII.2012, Guang-Lin Xie & Xin Wang leg. (1 male, 4 females MHBU); Tianmushan, Dahenglu, 14.VII.2012, Guang-Lin Xie leg. (1 female, MHBU); Longquan, Fengyangshan, 25.VII–1.VIII.2007, Hao-Yu LIU & Zhen-Hua Gao leg. (1 male, MHBU); Lin’an City, Mt. East Tianmushan, alt. 1050–1150 m, 13.IV.2011, Peng & Zhu leg. (1 female, SHNU); Longquan, Fengyangshan, 1250 m, 17.V.2007, Bao-Feng Zhou & Lei Wang leg. (1 female, SHEM24295628); Xitianmushan, 300–600 m, 2.VI.2016, Wen-Xuan Bi leg. (1 female, CBWX); ditto except 450 m, 4.VII.2016 (1 male, CBWX); ditto except 1300 m, 26.VII.2016 (10 males, 9 females, CBWX); ditto except 350 m, 11.VIII.2016, (1 female, CBWX); ditto except 450–350 m, 17.VI.2014 (5 males, 6 females, CBWX); ditto except 350 m, 23.VI.2014 (2 females, CBWX); Tianmushan, 1100 m, 2.V.2005, Wen-Xuan Bi leg. (1 female, CBWX); Anji County, Longwangshan, Shenxi, 250–550 m, 22–26.IV.2006, Wen-Xuan Bi leg. (1 female, CBWX); ditto except 350 m, 7–11.VI.2012 (1 male, CBWX); Longquan, Fengyangshan, Fengyanghu, 1560 m, 5.X.2013, Wen-Xuan Bi leg. (1 female, CBWX); Changhua, Qingliangfeng, 950 m, 13–17.VI.2014, Wen-Xuan Bi leg. (1 female, CBWX); Kaihua, Gutianshan, 500–850 m, 21.VI.2013, Wen-Xuan Bi leg. (7 males, 7 females, CBWX); Jiangxi Province: Longnan, Jiulianshan, 23.VII.2008, Fu-Ming Shi & Ming Qiu (1 female, MHBU); Ji’an City, Jinggangshan, Longtan, 26°35'47"N, 114°08'25"E, mixed forest, shrub, flower sweeping & beating, 760–920 m, 29.VII.2014, Chen, Hu, Lv & Yu leg. (1 female, SHNU); Guangxi Province: Longsheng, Huaping, 6.VI.1963, Si-Kong Liu leg. (1 female,
China: Jiangsu, Jiangxi, Fujian, Guangdong, Hainan and Taiwan. First records from Zhejing, Hunan, Guangxi, Yunnan, and Guizhou Provinces of China.
Cymbachus koreanus Chûjô & Lee, 1993: 95.
Sinocymbachus koreanus can be separated from all its congeners by having the body very short, nearly circular, strongly converging from 1/2 length of elytron to apex; each elytron with four small round spots, two basal spots located posterior to humerus and arranged in a slightly oblique line, and two apical spots located in apical ¼ length, arranged nearly horizontally.
7.5–7.9 mm. Width: 5.1–55 mm.
This species was originally described in the geuns Cymbachus Gerstaecker, 1857. However, the following characters of this species match the definition of Sinocymbachus proposed by Strohecker & Chûjô (1970): mesotibiae sexually dimorphic, toothed on inner edge in male, simple in female (
South Korea.
Engonius luteomaculatus Pic, 1921: 1.
Cymbachus luteomaculatus:
Sinocymbachus luteomaculatus:
Based on Strohecker & Chûjô (1970), Sinocymbachus luteomaculatus can be separated from all its congeners by having the basal and apical elytral maculae briefly undulately fasciate, but in one specimen examined by the author base of elytron is composed of two spots (Fig.
9.6–10.7 mm; width: 5.2–5.5 mm.
China: Yunnan Province: Zhanyi County, Zhujiangyuan, alt. 2100 m, 18.VII.2010, Ji-Shan Xu & Zhong-Kun Li leg. (1 male, 2 females, MHBU).
China: Yunnan.
Although few specimens only were available for this work, basal elytral maculae briefly undulately fasciate and the shape of the aedeagus were enough to determine they are the same species (Fig.
Cymbachus parvimaculatus Mader, 1938: 40.
Sinocymbachus parvimaculatus:
Sinocymbachus parvimaculatus can be separated from all its congeners by having the body very short, nearly circular and each elytron possessing two small round spots placed on the mid-line of each elytron.
7.7 mm–8.5 mm; width: 5.6 mm.
China: Yunnan Province: Nanjian, Sheyaojing, 2150–2300 m, 11.VII.2017, Wen-Xuan Bi & Yu-Tang Wang leg. (1 male, CBWX); Weishan, Weibaoshan, 2200 m 5.VII.2017, Wen-Xuan Bi leg. (1 female, CBWX); Weishan, Weibaoshan, 2300 m, 9.VII.2017, Wen-Xuan Bi leg. (1 female, CBWX); Eshan Country, alt. 1688 m, 28.VII.2009, Ji-Shan Xu & Li-Xiang Zhang leg. (1 female, MHBU); Shizong Country, Junzishan, 16.VII.2006, Jun-Tong Lang & Yu-Xia Yang leg. (1 female, MHBU); Lincang City, 1900 m, IV. 2016, Zi-Chun Xiong leg. (1 female, CCLX).
Length 7.8 mm. Body short oval, approximately 1.5 times as long as wide; strongly convex; smooth. Colour black with four orange round spots on elytra.
Head. Antenna composed of 11 antennomeres, rather stout, extending to ca. 1/2 body length, with antennomeres 1–8 distinctly longer than wide; scape 4.0 times as long as pedicel; antennomere 3 as long as antennomeres 4 and 5 combined; antennomere 4 as long as antennomere 5; antennomeres 5–8 gradually shorter; club composed of three antennomeres, wide, approximately 3.0 times as wide as antennomere 8, moderately flat, rather loose.
Thorax. Pronotum 1.5 mm long, 3.5 mm wide; widest at base; moderately coarsely and rather densely punctate; lateral and anterior margins narrowly bordered; anterior edge with moderately large stridulatory membrane; sides weakly undulate; anterior angles produced, bluntly rounded; posterior angles moderately acutely produced; disc weakly convex; median furrow absent; lateral sulci very short and deep, in form of triangular dent; basal sulcus curved, moderately deep. Prosternal process moderately widely separating procoxae; sides curved outwardly near apex, forked apically, not extending beyond front coxae. Mesoventral process nearly pentagonal, as long as wide, with short median ridge near basal 1/4. Elytra 5.9 mm long, 5.3 mm wide; 3.9 times as long as pronotum; 1.5 times as wide as pronotum; punctures as large as the pronotal ones, more dense; sides strongly curved, widest near 1/2 length of elytron; humeri weakly prominent. Each elytron with two round maculae: anterior macula located near basal 1/5, posterior macula located at apical 1/3, and all these maculae placed in mid-line of elytron; outer and inner margins of macula very distant from elytral lateral margin and suture. Mesotibia with small sharp tooth near apical 1/4 on inner edge, then with deep, small, U-shaped excision. Pro- and metatibiae simple.
Abdomen. Ventrite 1 longer than 2 and 3 combined; ventrites 2–4 subequal in length. Ventrite 5 with lateral margins gradually converging posteriorly; posterior margin broadly rounded medially. Aedeagus (Fig.
China: Yunnan.
Sinocymbachus politus Strohecker & Chûjô, 1970: 515
Based on Strohecker & Chûjô (1970), S. politus is most similar to S. decorus and S. luteomaculatus in appearance: both species share the elytra with two basal spots and one narrow transverse apical band. However, the body with cupreous sheen, two basal elytral maculae arranged in horizontal line and mesotibial tooth in male symmetric can separate it from all these similar species.
9.3 mm.
China: Taiwan.
The diagnosis of S. politus is based on its original description of Strohecker & Chûjô (1970) due to a lack of material for study.
Amphisternus quadrimaculatus Pic, 1927: 11.
Cymbachus quadrimaculatus:
Sinocymbachus quadrimaculatus:
Sinocymbachus quadrimaculatus differs from all its congeners in having each elytron with four small round spots, two basal spots located posterior to humerus and arranged horizontally, and two apical spots located in apical ¼ length, arranged in oblique line.
14.0–16.2 mm; width: 8.4–8.5 mm.
China. Zhejiang Province: Jiangshan City, Hongyanding, 11.VIII.2016, Yi-Bin Ba & Ling-Xiao Chang leg. (1male, 1 female, MHBU); Guangxi Province: Jinxiu, Changtong, Dayaoshan, 23.V.2019, Chun-Fu Feng leg. (4 males, 6 females, CCLX); Xingan, Huanjiang, 5.VII.2006 (1 male, CCLX); Jinxiu, Yinshan Protection Station, 1200 m, 9.VII.2014, Xiao-Bin Song leg. (1 female, CBWX); Laibin, Jinxiu, Dayaoshan, 1017 m, 16.V.2015, Yan-Quan Lu leg. (1 male, 1 female, CCCC); Hunan Province: Tongdao County, Mujiao Township, 26.VII.2004, Ji-Liang Wang leg. (2 males, 2 females, MHBU); Sangzhi County, near Tianpingshan Control Station, 15.IX.2015, Chi Jin leg. (1 male, CCLX); Hainan Province: Bawangling, 9.VII.2006, Ji-Liang Wang & Chao Gao leg. (1 male, 5 females, MHBU); Wuzhishan, 750 m, 15.X.2014, Chao Wu leg. (1 female, CBWX); Fujian Province: Ningde, Nanjiao, Houshancun, 200–300 m, 3–5.X.2012, De-Yao Zhou leg. (1 male, 1 female, CBWX).
Vietnam: Tonkin; China: Fujian. First records from Zhejiang, Guangxi, Hunan and Hainan Provinces of China.
Some live or fresh specimens from Zhejiang or Fujian were observed with the elytral maculae pink in colouration (Fig.
Amphisternus quadriundulatus Chûjô, 1938: 397.
Sinocymbachus quadriundulatus:
Based on
7.5–8.5 mm.
China: Taiwan.
1 | Elytra very short, nearly circular | 2 |
– | Elytra oval or short oval | 3 |
2 | Each elytron with four spots; elytral sides strongly converging from 1/2 length of elytron to apex | S. koreanus comb. nov. |
– | Each elytron with two spots; elytral sides gradually converging from 1/2 length of elytron to apex (Fig. |
S. parvimaculatus |
3 | Intercoxal process of mesoventrite with large tubercle at base (Fig. |
S. excisipes |
– | Intercoxal process of mesoventrite with short median ridge at base; ventrite 5 with posterior margin not projecting medially in both sexes | 4 |
4 | Apical elytral maculae composed of round spots | 5 |
– | Apical elytral macula transverse | 7 |
5 | Base of elytron with two spots (Fig. |
S. quadrimaculatus |
– | Base of elytron with one spot | 6 |
6 | Scutellum distinctly longer than wide (Fig. |
S. bimaculatus |
– | Scutellum as long as wide or slightly longer than wide (Fig. |
S. humerosus |
7 | Basal elytral maculae composed of two spots | 8 |
– | Basal elytral macula transverse | 10 |
8 | Body shiny; humeri distinctly prominent | 9 |
– | Body opaque; humeri weakly prominent (Fig. |
S. luteomaculatus |
9 | Body with cupreous sheen; basal elytral maculae arranged in horizontal line | S. politus |
– | Body without cupreous sheen; basal elytral maculae arranged in oblique line (Fig. |
S. decorus |
10 | Elytra short oval; elytral maculae without distinct projections (Fig. |
S. sinicus sp. nov. |
– | Elytra oval or long oval, elytral maculae with distinct projections | 11 |
11 | Elytra distinctly long oval (especially in males); sides nearly parallel (Fig. |
S. longipennis sp. nov. |
– | Elytra oval; sides curved | 12 |
12 | Body opaque (Fig. |
S. angustefasciatus |
– | Body shiny | 13 |
13 | Body with cupreous sheen; mesotibial tooth in male symmetric | S. quadriundulatus |
– | Body without cupreous sheen; mesotibial tooth in male asymmetric | 14 |
14 | Anterior margin of mesoventral process as wide as posterior margin (Fig. |
S. fanjingshanensis sp. nov. |
– | Anterior margin of mesoventral process much wider than posterior margin (Fig. |
S. wangyinjiei sp. nov. |
We are indebted to Dr. W. Tomaszewska (Museum and Institute of Zoology, Warsaw, Poland), Dr. J. Poorani (Indian Council of Agricultural Research), and Dr. Yasen Mutafchiev (Bulgarian Academy of Sciences, Sofia) for providing useful comments to improve this manuscript. We thank Dr. Zhu Li (Beijing Museum of Natural History, China) and Dr. Yu-Yu Wang (Hebei Agriculture University, China) very much for improving the English of this manuscript. This research was supported by Beijing Natural Science Foundation (Grant No. 5194025), China Postdoctoral Science Foundation (Grant No. 2018M641255) and Innovation Team Project of Beijing Academy of Science and Technology (IG201806C2).