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 : 359

Coelostoma (s. str.) orbiculare ( Fabricius, 1775)

( Figs. 13–14 , 19 )

Hydrophilus orbicularis Fabricius, 1775: 229 . For complete synonymy see Hansen (1999).

Type material: not examined.

Material examined. CZECH REPUBLIC: 4 spec., Bohemia, Horní Maxov (5257), 14.v.2009, “Malá Strana” nature reserve, 50°45ʹ59ʺN 15°12ʹ02ʺE. M. Fikáček & P. Vonička leg. ( NMPC). CHINA: BEIJING: 1 male ( SYSU), Peiping, with a label “ Coelostoma fabriciusi Montr. ” HEBEI: 1 male ( SYSU), Baiyangdian, Dazhangzhuang village, 03-06.vii.2013, Jidong Peng et Xichao Zhu leg.; 1 male, 1 female ( HBUM), same data as the former. HENAN: 1 male, 1 female ( IZCAS), Huixian County, Baligou, 650m, 12.vii.2002, Wenzhu Li leg.

Diagnosis. Body size 4.1–5.0 mm. Prosternum not convex medially, not carinate, with or without a tiny tooth anteriorly. Head, pronotum and elytra with similar punctation; elytra with lateral portion more strongly punctate, without traces of series of punctures laterally. Mesofemora without dense pubescence ( Fig. 13 ). First abdominal ventrite not carinate, last abdominal ventrite not emarginate or truncate apically. Aedeagus ( Fig. 19 ): 0.95 mm long. Median lobe not reaching apices of parameres, acute apically, only slightly widening towards base; gonopore rounded, subapical. Parameres rather wide throughout, sharply pointed apically.

Biology. Living in various types of stagnant waters with submerged vegetation, especially in shallow littoral zones.

Distribution. China (Beijing, Hebei, Henan), Armenia, Austria, Belgium, Britain, Bulgaria, Czech Republic, Croatia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Japan, Kazakhstan, Latvia, Lithuania, Netherlands, Norway, Poland, Romania, Russian Federation, Slovakia. ( Hansen 1999, Orchymont 1936). First record from China.

Figures

FIGURES 9 – 14. Characters distinguishing the subgenera of Coelostoma occurring in China. 9 – 10: subgenus Lachnocoelostoma (C. bifidum sp. nov.); 11 – 12: subgenus Holocoelostoma (C. stultum); 13 – 14: subgenus Coelostoma s. str. (C. orbiculare). 9, 11, 13: mesofemur in ventral view; 10, 12, 14: posterior margin of andominal ventrite 5.

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.