Helochares (Hydrobaticus) neglectus ( Hope, 1845 )

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 : 177

Helochares (Hydrobaticus) neglectus ( Hope, 1845)

( Figs. 19–20 , 24 )

Hydrobius neglectus Hope, 1845: 16 .

Helochares (Hydrobaticus) neglectus (Hope) ; d’Orchymont, 1919: 150.

Material examined: 2 exs. (IAECAS): Hainan Province, Qionghai City, Wanquan Town , 2007.11.14, 19°11’N, 110°23’E, 38 m, leg. Bian & Tong ; 3 exs. (IAECAS): Hainan Province, Wanning City , 50 m, 1996.1.25, leg. Ji & Wang ; 1 ex. (IAECAS): Yunan Province, Xishuangbanna , 1500 m, 1999.11, leg. Wang & Wei ; 1 ex. (IAECAS): Guangxi Province, Nanning City , Huangjiang County, 208 m, 2011.11.14, leg. Bian, Guo & Tong.

Diagnosis. Habitus as in Figs. 19–20 . BL: 6.0– 7.5 mm, BW: 3.00– 3.65 mm. Body oval, large, moderately convex. Head, pronotum, elytra and ventral side dark brown, apex of tarsal claws black. Clypeus dark brown, broad; anterior margin broadly emarginate; maxillary palpi moderately long and slender, the second palpomere curved inwards. Anterior area of pronotum with a black mark shaped as an umbrella; posterior margin weakly corrugate, with a transverse groove. Elytra widest at mid-length, then slightly attenuated posteriorly; strial punctures deeply impressed, distinctly larger than the interstrial punctures; interstriae wide and flat.

Aedeagus ( Fig. 24 ) 1.5 mm long, elongate and parallel-sided. Basal piece short, about 0.2-times of aedeagus length. Median lobe distinctly longer than parameres, apex of median lobe with a structure just liking “horn”, membranous inner sac strongly sclerotized ( Fig. 24a ); apophyses of median lobe extending to base of basal piece. Parameres vestigial on basal 0.6.

Distribution. China: Fujian, Guangdong, Guangxi, Hainan, Hubei, Jiangsu, Jiangxi, Shanghai, Sichuan, Yunnan, Zhejiang; Cambodia; Indonesia; Malaysia; Philippines; 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).