Helochares (Hydrobaticus) lentus Sharp, 1890

Dong, Xue & Bian, Dongju, 2021, Three new species and two new records of Helochares (Hydrobaticus) MacLeay 1871 from China (Coleoptera: Hydrophilidae: Acidocerinae), Zootaxa 4950 (1), pp. 166-180 : 175-177

Helochares (Hydrobaticus) lentus Sharp, 1890

( Figs. 17–18 , 23 )

Helochares (Hydrobaticus) lentus Sharp, 1890: 352 .

Helochares (Grapidelochares) lentus Sharp ; Zaitzev, 1908: 381.

Helochares (Hydrobaticus) lentus Sharp ; d’Orchymont, 1923: 9.

Material examined: 6 exs. (IAECAS): Guangdong Province, Yunfu City, Yunan County, upper reaches of Dahe Reservoir , 90 m, 111°24′53″E, 23°11′27″N, 2017. 11.16, leg. Peng & Sun ; 2 exs. (IAECAS): Guangdong Province, Yunfu City, Yunan County, water source upper reaches of Dahe Reservoir , 133 m, 111°25′7″E, 23°12′2″N, 2017.11.16, leg. Peng & Sun ; 5 exs. (IAECAS): Guangdong Province, Yunfu City, Yunan County, Tongle Dashan Reserve , 269 m, 111°23′6″E, 23°11′49″N, 2017.11.16, leg. Peng & Sun ; 2 exs. (IAECAS): Guangdong Province, Shaoguan City, Ruyuan County, lower reaches of Nanling Mountains reserve , 476 m, 113°5′4″E, 24°55′46″N, 2017.11.26, leg. Peng & Sun ; 12 exs. (IAECAS): Guangxi Province, Jingxi City, Wuling Forest Park, 781 m, 106°26’31”E, 22°4’22”N, 2018.3.30, leg. Peng & Zhu ; 10 exs. (IAECAS): Guangxi Province, Yuewei Town , 494 m, 106°36’1”E, 22°56’35”N, 2018.3.28, leg. Peng & Zhu ; 1 ex. (IAECAS): Guangxi Province, Jingxi City, Longbang Town, Damao Village , 782 m, 106°16’35”E, 22°52’31”N, 2018.3.29, leg. Peng & Zhu ; 1 ex. (IAECAS): Guangxi Province, Jingxi City, Longbang Town, Jiebang Village , 671 m, 106°18’4”E, 22°52’56”N, 2018.3.29, leg. Peng & Zhu ; 1 ex. (IAECAS): Hainan Province, Qiongzhong County, lower reaches of Baihualing Waterfall , 347 m, 109°49’15”E, 19°0’30”N, 2018.3.15, leg. Tong, Peng & Zhu ; 12 exs. (IAECAS): Hainan Province, Qiongzhong County, Shenyun Village , 253 m, 109°36’21”E, 18°59’40”N, 2018.3.17, leg. Tong, Peng & Zhu ; 4 exs. (IAECAS): Hainan Province, Lingshui County, Diaoluo Mountain Forest Park, 720 m, 109°36’13”E, 18°40’26”N, 2018.3.22, leg. Tong, Peng & Zhu ; 7 exs. (IAECAS): Yunnan Province, Tengchong City, Lianghe County, Longhe Village , 1074 m, 24°48′21.158″N, 98°17′51.522″E, 2016.10.22, leg. Wang, Peng & Sun ; 5 exs. (IAECAS): Yunnan Province, Mangshi, Nongkan Village , 780 m, 24°9′46.692″N, 98°6′5.142″E, 2016.10.18, leg. Wang, Peng & Sun ; 5 exs. (IAECAS): Yunnan Province, the road from Nanleng village, Mangshi to Ruili City , 839 m, 24°9′37.812″N, 98°6′24.198″E, 2016.10.16, leg Wang, Peng & Sun ; 1 ex. (IAECAS): Yunnan Province, Tengchong City, Mingguang Village bridge downstream, 1826 m, 25°28′39.318″N, 98°31′53.016″E, 2016.10.23, leg. Wang, Peng & Sun ; 2 exs. (IAECAS): Yunnan Province, Tongchong City, Zhongtang Village , 1803 m, 25°26′3.102″N, 98°31′16.566″E, 2016.10.23, leg. Wang, Peng & Sun ; 26 exs. (IAECAS): Yunnan Province, the road from Nanleng village, Mangshi to Ruili City , 827 m, 24°13′50.83″N, 98°15′51.534″E, 2016.10.16, leg. Wang, Peng & Sun ; 2 exs. (IAECAS): Yunnan Province, Ruili City, Kema Village , 839 m, 24°3′54.540″N, 97°57′47.813″E, 2016.10.17, leg. Wang, Peng & Sun ; 1 ex. (IAECAS): Yunnan Province, Tongchong City, Mingguang Village bridge upstream, 1940 m, 25°28′39.318″N, 98°31′53.016″E, 2016.10.24, leg. Wang, Peng & Sun ; 2 exs. (IAECAS): Yunnan Province, Tongchong City, Chenjia Village , 1615 m, 24°52′59.268″N, 98°34′32.322″E, 2016.10.26, leg. Wang, Peng & Sun ; 3 exs. (IAECAS): Yunnan Province, Dali City, Yongping County, the road of Haichong , 1570 m, 99°33’03”E, 25°23’13”N, 2018.10.18, leg. Peng, Zhu & Dong ; 1 ex. (IAECAS): Yunnan Province, Dali City, Yongping County, Changjie Village , 1533 m, 99°34’22”E, 25°19’23”N, 2018.10.18, leg. Peng, Zhu & Dong ; 10 exs. (IAECAS): Yunnan Province, Baoshan City, Mangkuan Town, Mangkuan Village , 847 m, 98°51’44”E, 25°26’53”N, 2018.10.23, leg. Peng, Zhu & Dong ; 1 ex. (IAECAS): Yunnan Province, Baoshan City, Xinguang Village , 1026 m, 98°50’53”E, 25°28’18”N, 2018.10.23, leg. Peng, Zhu & Dong.

Diagnosis. Habitus as in Figs. 17–18 . BL: 4.0– 5.5 mm, BW: 2.0– 2.8 mm. Body oval, moderately convex. Head, pronotum and elytra yellowish-brown, ventral side dark brown, apex of tarsal claws black. Clypeus brown, broad; anterior margin broadly emarginate; frons dark brown, with a pair of splayed black marks. Elytra slightly wider than pronotum; serial punctures distinct and sparse, much larger than the interstrial punctures, posterior punctures larger; interstriae wide and flat.

Aedeagus ( Fig. 23 ) 0.9 mm long. Basal piece very short, about 0.2-times of aedeagus length. Median lobe distinctly longer than parameres, robust in basal 0.8, then distinctly narrowed, lateral margin strongly sclerotized in distal 0.2 ( Fig. 23a ); membranous inner sac strongly sclerotized, with two long spines on each side ( Fig. 23b ); apophyses of median lobe extending to base of basal piece. Parameres broad in basal 0.6, then gradually narrowed towards the apices ( Fig. 23c ).

Distribution. China: Fujian, Guangdong, Guangxi, Guizhou, Hunan, Jiangxi, Sichuan, Taiwan, Yunnan; Bangladesh; Cambodia; India; Indonesia; Malaysia; Nepal; Sri Lanka; Thailand; Vietnam.

Figures

FIGURES 17–20. Habitus. 17, 18. Helochares (Hydrobaticus) lentus; 19, 20. Helochares (Hydrobaticus) neglectus. 17, 19. Dorsal view; 18, 20. Ventral view.

FIGURES 21–24. Aedeagus (ventral view). 21. Helochares (Hydrobaticus) minor (a. Sea anemone-like structure in membranous inner sac; b. Dentiform bulges); 22. Helochares (Hydrobaticus) nipponicus (a. Parameres; b. Sea anemone-like structure in membranous inner sac); 23. Helochares (Hydrobaticus) lentus (a. Lateral margins of median lobe; b. Long spines; c. Parameres); 24. Helochares (Hydrobaticus) neglectus (a. membranous inner sac).