A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae) Author Jiang, Zhuo-Yin 0000-0001-6825-4283 State Key Laboratory of Biocontrol and Institute of Entomology, Sun Yat-sen University, Guangzhou 510275, China. zhuoyin _ jiang @ 126. com; https: // orcid. org / 0000 - 0001 - 6825 - 4283 Author Zhao, Shuang Guangzhou Customs Technology Center, Nansha District, Guangzhou, China. Author Yang, Zhen-Yu Brilliant Landscaping and Gardening Company Limited, Macau. Author Jia, Feng-Long 0000-0003-2391-5038 State Key Laboratory of Biocontrol and Institute of Entomology, Sun Yat-sen University, Guangzhou 510275, China. fenglongjia @ aliyun. com; lssjfl @ mail. sysu. edu. cn; http: // orcid. org / 0000 - 0003 - 2391 - 5038 fenglongjia@aliyun.com Author Hájek, Jiří 0000-0001-5779-1542 Department of Entomology, National Museum, Cirkusová 1740, CZ- 193 00 Praha 9 - Horní Počernice, Czech Republic. jiri. hajek @ nm. cz; https: // orcid. org / 0000 - 0001 - 5779 - 1542 jiri.hajek@nm.cz text Zootaxa 2022 2022-04-04 5124 3 251 295 journal article 53387 10.11646/zootaxa.5124.3.1 de55f596-c349-4ca2-a826-0e2bad912aa3 1175-5326 6410696 67D4C618-C7C2-4FFC-925B-B260E11CD7B4 Copelatus parallelus Zimmermann, 1920 ( Figs 16 , 51–52 ) Copelatus parallelus Zimmermann, 1920: 226 . Type locality. “Setsu, Zentral-Japan” [ Japan , Honshu , Osaka Prefecture , Settsu , ca. 34°46′N 135°33′] . Type material. Holotype ♂ , originally deposited in Zoologisches Museum , Centrum für Naturkunde , Universität Hamburg , Hamburg , Germany ; destroyed during WW2. Material examined. CHINA : Hebei : 1 ♀ , Baiyangdian , Mapu vill., 16.vii.-11.viii.2012 , J. Wang & P. Wei leg. Hubei : 1 ♀ , Wuchang , 17.v.1961 , Z. Pu leg. Hunan : 1 ♂ , Huaihua , Yushuwan , 17.vi.1965 , Z. Chen leg. Shanghai : 1 ♀ , 20.iv.1950 (all SYSU ). Diagnosis. Small species (TL: 3.5–4.0 mm), oblong-oval species, lateral sides of elytra nearly parallel in basal two thirds of their length. Head reddish; pronotum dark brown with reddish anterior margin and lateral sides; elytra brownish black, with broadly orange base and thin lateral orange band broadening posteriorly to lateral subapical spot. Pronotum with several short strioles basally and laterally. Each elytron with five longitudinal discal striae: all striae beginning at base and ending approximately in apical fifth of elytral length ( Fig. 16 ). Median lobe simple, sickle shaped, broad (widest at middle), only slightly narrowing to beak-shaped apex ( Fig. 51 ). Parameres broad, ‘D’-shaped; apex long and slender; apical lobes long, club-shaped ( Fig. 52 ). Female similar to male in habitus. Distribution. A species described from Japan and recently recorded also from Korea ( Jung et al. 2020 ). First records from China ( Hebei , Hubei , Hunan and Shanghai ) ( Fig. 82 ).