Review of the genus Elasmostethus (Hemiptera: Heteroptera: Acanthosomatidae) from the Korean Peninsula Author Jung, Sunghoon text Zootaxa 2017 2017-09-15 4320 2 351 365 journal article 32087 10.11646/zootaxa.4320.2.9 1f178728-7a1b-402e-a7c2-7caa361f39f5 1175-5326 891940 03F80D25-6622-40C5-9856-235E8A7Cd9Dc Elasmostethus humeralis Jakovlev, 1883 Figs. 9, 10, 13, 14, 33, 34, 43, 50, 56 Elasmostethus humeralis Jakovlev, 1883a : 15 ; 1883b: 426 (original description). Type locality: Russia: Vladivostok. Elasmostethus matsumurae Horváth, 1899 : 366 . Type locality: Japan: Yesso [= Hokkaido], env. of Sapporo. Synonymized by Horváth (1907: 299) . Elasmostethus matsumurae : Furukawa (1930: 55) (record from Korea ). Elasmostethus humeralis : Lee (1971: 222, 502) (redescription, photo, records from South Korea , distribution), Josifov & Kerzhner (1978: 165) (records from Korea ), Kwon et al. (2001 : 374) (bibliography, records from Korea , distribution, host plants), Yamamoto (2003: 53, 61) (in key, redescription, figures, records, distribution, host plants), Göllner-Scheiding (2006: 172) (catalogue, distribution), Tsai et al. (2015: 10) (behaviour). Diagnosis. Recognized by abdominal mediotergites V–VII being pale; the presence of two pairs of setal tufts (a shorter, comb-like upper, and a longer lower) at the middle of the ventral margin (Figs. 33, 43: ut, lt), but lack of a pair of strong, heavily sclerotized and pigmented denticles on the pygophore; paramere being subtriangular, with smooth lateral margins ( Fig. 50 ); and the posterior margin ventrite VIII of the female being weakly emarginate medially (Fig. 34). Measurements. ♂ / ♀ . Body length 10.00–11.43/10.49–11.16; head width across eyes 1.75–1.86/1.98; lengths of antennal segments: scape 0.89–1.18/0.92–0.97, basipedicellite 1.34–1.77/1.43–1.51, distipedicellite 1.11–1.45/ 1.07–1.36, basiflagellum 1.63–1.97/1.48–1.81, distiflagellum 1.44–1.55/1.35–1.48; humeral width of pronotum 5.11–5.69/5.41–5.72; basal width of scutellum 2.7–2.96/2.93–3.08; length of scutellum 3.30–3.58/3.27–3.59; lengths of profemur and protibia 2.21–2.57/2.08–2.69, 1.89–2.50/2.40–2.50; lengths of mesofemur and mesotibia 2.46–2.95/2.60–2.95, 2.35–2.83/2.21–2.77; lengths of metafemur and metatibia 2.84–3.67/3.2–3.33, 3.24–4.00/ 3.50–3.62. Material examined. SOUTH KOREA : Gangwon-do : Mt. Eungbok, Myeonggae-ri, Nae-myeon , Hongcheon-gun , 12.viii.2010 , JC. Yun ( 1 ♀ NIBR ) ; Mt. Deokse , Cheondo-ri , Seohwa-myeon , Inje-gun , 31.vii.2009 , YB. Cho ( 1 ♂ 1 ♀ NIBR ) . Gyeonggi-do : Sohol-eup, Pocheon-si, on Aralia cordata Thunb. , 06.ix.2014 , WG. Kim ( 1 ♂ 2 ♀♀ CNU ) ; same locality and host plant, 20.ix.2014 , WG. Kim ( 1 ♂ 9 ♀♀ CNU ) . Gyeongsangbuk-do : Namgok-ri, Euncheok-myeon, Sangju-si, on A. cordata Thunb. , 17.x.2014 , WG. Kim ( 1 ♂ CNU ) ; Bangchongyo, Seo-myeon, Uljin-gun, 22.vii.2010 , JW. Lee (1 ♂ 2 ♀♀ NIBR). Jeollabuk-do : Mt. Deogyu , Seolcheon-myeon , Muju-gun , 30.v.1992 , JW. Pack ( 1 ♀ NIBR ) . NORTH KOREA : Hwanghaenam-do : Mt. Kuwol , Unyul-myoen, M.I . Cho ( 5 ♂♂ 1 ♀ CNU ) ; Ryanggang-do : Mt. Pekto-san , 15.vii.2012 , CD. Han ( 3 ♀♀ NIBR ) . Distribution. Korea , China , Japan , Russia (Far East Territory). Bionomics. This species is widely distributed in Korea and it was frequently observed on various species of Araliaceae and Ulmaceae ( Kwon et al. 2001 , present study); in Japan it was recorded from members of Araliaceae and Apiaceae ( Yamamoto 2003 ) . FIGURES 1–16. Habitus of Elasmostethus spp. 1–4, 9–12. dorsal view; 5–8, 13–16. ventral view; 1, 5. E. brevis ♂ ; 2, 6. E. brevis ♀ ; 3, 7. E. interstinctus ♂ ; 4, 8. E. interstinctus ♀ ; 9, 13. E. humeralis ♂ ; 10, 14. E. humeralis ♀ ; 11, 15. E. yunnanus ♂ ; 12, 16. E. yunnanus ♀ . Scale bars: 2 mm . Remarks. This species is similar to E. brevis in appearance, however, abdominal tergites V–VII are entirely pale, whilst they are dark in E. brevis . In addition, this species usually has a large, dark or red triangular spot occupying the middle of the basal margin of the scutellum ( Fig. 56 ). The abdominal ventrites III–VII are usually marked with a pair of dark spots mesad of the spiracles (Figs. 13, 14), but these might occasionally be lacking.