Coelostoma

Jia, Fenglong, Aston, Paul & Fikáček, Martin, 2014, Review of the Chinese species of the genus Coelostoma Brullé, 1835 (Coleoptera: Hydrophilidae: Sphaeridiinae), Zootaxa 3887 (3), pp. 354-376 : 357-358

Coelostoma (s. str.) fallaciosum Orchymont, 1936

( Fig. 15 )

Coelostoma fallaciosum Orchymont, 1936: 19 .

Type material examined: PARATYPE: 1 male ( IRSNB): ‟Coll. R. I. Sc. N. B. / Borneo // Nord-Borneo / ex coll. Frühstorfer // A. dʼOrchymont det. 1936 / Coelostoma (s.str) / fallaciosum m.”

Additional material examined. GUANGDONG: 1 male, Shenzhen, Neilingding Island, 13.vi.2002; 7 spec., same locality, but 4.vii.1998, Haidong Chen leg.; 1 spec., same locality as the former, but 12.iv.1998, Zhenyao Chen leg.; 2 spec., same locality as the former, 12.v.1998, Qisheng Peng leg.; 1 spec, same data as the former, but 8.v.1998; 1 spec. same data as the former, but Ruizhen Wen leg.; 2 spec., Shaoguan, Danxiashan Mt., 27.v.2010, leg. Fenglong Jia; 1 male, 1 female, Fengkai, Heishiding Natural Reserve, in light trap, 3.vi.2011, Fenglong Jia leg.; 8 spec., Danxiashan Mt., Yangyuanshan, Huiyuanchi pool, 08.vi.2012, Fenglong Jia leg.; 1 male, Danxiashan Mt., plant nursery, 08.vi.2012, light trap; 15 spec., Danxiashan, a small pool near Xianglonghu lake, 08.vi.2012, Fenglong Jia leg.; 1 male, Guangzhou, Lianhe, 18.x.1964, leg. Zhenyao Chen. HONG KONG: 30 spec. ( AFCD: 6 spec., PCPA: 24 spec.), Wang Tong to light trap, from 6.v.2009 to 18.ix.2012, Paul Aston leg. YUNNAN: 1 male ( ASHC), 2 females ( AWWC): Xishuangbanna, 20 km NW Jinghong, Man Dian vicinity, at light, 22°08ʹN 100°40ʹE, 740 m, 26.v.2008, A. Weigel leg. TAIWAN: 1 spec. ( HUMS), without more precise data.

Diagnosis. Body size 5.1–5.5 mm. Prosternum moderately convex medially, not carinate but with a weak tooth anteriorly. Head, pronotum and elytra with similar punctures; elytra with lateral portion more strongly punctate, without traces of series of punctures laterally. Mesofemora without dense pubescence. First abdominal ventrite not carinate, last abdominal ventrite not emarginate or truncate apically. Aedeagus ( Fig. 15 ): 0.9 mm long. Median lobe not reaching to apices of parameres, narrowly rounded apically, slightly widened subbasally; gonopore subapical, 8-shaped. Parameres widening apicad, pointed apically, straight on inner face and convex on outer face in apical portion.

Biology. We collected this species on wet stones or on the ground covered by leaf litter. In Hong Kong, this species was collected in light traps during warmer months, but no individuals were collected using this method from January to March and none were found directly in habitat sampled for aquatic beetles.

Distribution. China (Fujian, Guangdong, Hong Kong, Taiwan), Indonesia, Malaysia, Nepal, Vietnam ( Hansen 1999, Orchymont 1936).

Figures

FIGURES 15 – 23. Aedeagus of Chinese Coelostoma. 15: C. fallaciosum, 16: C. vitalisi, 17 – 18: C. vividum (17: specimen from Guangdong: Heishiding; 18: paratype from Sumatra: Bengealis), 19: C. orbiculare, 20: C. bifidum sp. nov., 21: C. turnai (specimen from Hunan), 22: C. hajeki sp. nov., 23: C. hongkongene sp. nov.