Coelostoma (s. str.) subditum Orchymont, 1936

Jia, Fenglong, Lin, Renchao, Chan, Eric, Skale, Andre & Fikáček, Martin, 2017, Two new species of Coelostoma Brullé, 1835 from China and additional faunistic records of the genus from the Oriental Region (Coleoptera: Hydrophilidae: Sphaeridiinae: Coelostomatini), Zootaxa 4232 (1), pp. 113-122 : 118

Coelostoma (s. str.) subditum Orchymont, 1936

( Figs 12–14 )

Coelostoma (s.str.) subditum Orchymont, 1936: 20 . Type locality: Indonesia, Borneo, Pontianak.

Type material examined: Paratype: 1 male (IRSNB): “[male symbol] // Brunei / Borneo / Waterstradt // A. dʼOrchymont 1936 / Coelostoma (s.str.) / subditum m. // Para- / type”.

Additional material examined. CHINA: Hong Kong: 2 males, 1 female ( SYSU): Hong Kong, no other data; 3 spec. ( PCPA): Sam A Tsuen 4.xi.2014, Graham Reels lgt.; 2 spec. ( PCPA): Luk Keng , 20.xi.2014, Graham Reels lgt.; 7 spec. ( PCPA): Kuk Po , 24.xi.2014, Graham Reels lgt. Yunnan: 2 males ( NMPC, ASHC): Xishuangbanna, 20 km NW Jinghong, Man Dian , 22°07ʹ80ʺN 100°40ʹ05ʺE, 720 m , 23.v.2008, A. Weigel lgt.; 1 male ( AWWC): Xishuangbanna, 23 km NW Jinghong, Na Ban VIII., 22°10ʹ04ʺN 100°39ʹ52ʺE, 680 m , 5.vi.2008, A. Weigel lgt.

Distribution. China ( Hong Kong, Yunnan), Borneo (Indonesian part, Brunei). First record for China and continental Asia.

Remarks. This species was described from the city of Pontianak and from Brunei (both on Borneo) ( Orchymont 1936); no other records of the species were known until now. The Chinese specimens examined here agree with the examined paratype from Borneo in all details of external morphology as well as in the morphology of the aedeagus ( Figs. 12–14 ): median lobe shorter than parameres, almost triangularly narrowing towards apex, apex bluntly rounded, gonopore situated apically, rhomboid, surrounded by series of stout setae; parameres with lobes covering basal half of the median lobe, nearly continually arcuate on outer face except of very weak sinuation apically, apex of paramere slightly projecting mesad, pubescent on mesoapical face.

Figures

FIGURES 1 – 14. Aedeagus of Coelostoma species. 1 – 4: C. tangliangi sp. nov., paratype; 5 – 8: C. horni from southern Yunnan: Xishuangbanna; 9: C. huangi from Vietnam: 6 km NE Lam Khan; 10: C. diversum, paratype from Sumatra: Panjinggahan; 11: C. jaechi sp. nov., paratype; 12 – 14: C. subditum (12 – 13: from Yunnan: Xishuangbanna; 14: from Hongkong). All figures except Fig. 13 to the same scale.