Helochares (Hydrobaticus) minor d’Orchymont, 1925

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 : 173-174

Helochares (Hydrobaticus) minor d’Orchymont, 1925

( Figs. 13–14 , 21 )

Helochares (Hydrobaticus) minor d’Orchymont, 1925: 293 .

Material examined: 4 exs. (IAECAS): Hainan Province, Qionghai, Baishiling , 2007.11.14, 19°11′N, 110°24′E, 38 m, leg. Bian & Tong.

Diagnosis. Habitus as in Figs. 13–14 . BL: 3.3–3.5 mm, BW: 1.6–1.7 mm. Body oval, moderately convex. Head, pronotum and elytra brown, apex of tarsal claws and ventral side black. Punctures on head dense. Punctures on pronotum denser and larger than those on head; pronotum with dark mark and several large punctures near anterior margin medially. Elytra with scutellary stria and ten striae; interstriae flat, with small punctures; strial punctures much larger and deeper than interstrial punctures.

Aedeagus ( Fig. 21 ) 0.7 mm long, distal 1/3 gradually narrowed. Basal piece short, about 0.2-times of aedeagus length. Parameres short. Median lobe broadly membranous, with a sea anemone-like medial structure as apical region ( Fig. 21a ). Apophyses of median lobe extending to base of basal piece. Membranous inner sac with dentiform bulges on each side ( Fig. 21b ).

Distribution. China: Hainan (new record species to China); India; Vietnam.

Figures

FIGURES 13–16. Habitus. 13, 14. Helochares (Hydrobaticus) minor; 15, 16. Helochares (Hydrobaticus) nipponicus. 13, 15. Dorsal view; 14, 16. 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).