Elasmostethus nubilus
Creators: name: Jung, Sunghoon
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Acanthosomatidae
Elasmostethus
Elasmostethus nubilus

description: Elasmostethus nubilus (Dallas, 1851)
Figs. 17, 18, 21, 22, 37, 38, 45, 52, 58
Acanthosoma nubilum Dallas, 1851: 305 (original description). Type locality: Hong Kong.
Dichobothrium nubilum: Lee (1971: 226, 504) (part) (redescription, record from South Korea, distribution), Kwon et al. (2001: 373) (bibliography, record from South Korea, distribution, host plants).
Elasmostethus nubilus: Yamamoto (2003: 53, 63) (in key, redescription, figures, records, distribution, host plants), Göllner- Scheiding (2006: 173) (catalogue, distribution), Aukema et al. (2013: 431) (catalogue, distribution).
Diagnosis. Recognized by the mediotergites of abdominal segments V–VII being partly pale; the humeral angles of the pronotum being more or less rectangularly protruding; the posterolateral angles abdominal segment VII being moderately produced (sometimes not reaching apical margin of pygophore in the male), but with sharp apical angles in both sexes (Figs. 37–38); the posterior margin of the pygophore being broadly rounded in ventral view, provided with uniformly distributed, dense setae on its ventral margin (Fig. 37); the paramere with an obtuse outer apical angle (Fig. 52); and the posterior margin of abdominal segment VIII of the female forming approximately a single arc (Fig. 38).
Measurements. ♂ / ♀. Body length 8.87–8.98/9.05–10.20; head width across eyes 1.66–1.69/1.72–1.75; lengths of antennal segments: scape 0.65–0.68/0.57–0.60, basipedicellite 1.25–1.28/1.05–1.22, distipedicellite 1.04–1.14/0.88–0.98, basiflagellum 1.17–1.50/1.19–1.30, distiflagellum 1.04–1.23/1.04–1.10; humeral width of pronotum 4.53–4.62/4.99–5.18; basal width of scutellum 2.40–2.51/2.75–2.80; length of scutellum 2.55–2.93/ 2.95–3.06; lengths of profemur and protibia 1.63–2.03/1.76–1.89, 1.96–1.98/1.75–1.83; lengths of mesofemur and mesotibia 1.85–1.92/2.11–2.18, 1.76–1.90/1.91–2.05; lengths of metafemur and metatibia 2.10–2.33/2.10–2.63, 2.45–2.63/2.41–2.63.
Material examined. SOUTH KOREA: Gyeonggi-do: Sohol-eup, Pocheon-si, South Korea, on Aralia cordata Thunb., 06.ix.2014, WG. Kim (1 ♂ CNU); Yul-dong, Bundang-gu, Seongnam-si, on A. cordata Thunb., 21.ix.2014, WG. Kim (7 ♀♀ CNU); Jangan-myeon, Hwaseong-si, 6.vii.2009. Y. Kwon (1 ♂ NIBR). Gyeongsangbuk-do: Naeseo-ri, Nongam-myeon, Mungyeong-si, on A. cordata Thunb., 17.x.2014, WG. Kim (1 ♂ CNU); Namgok-ri, Euncheok-myeon, Sangju-si, on A. cordata Thunb., 17.x.2014, WG. Kim (4 ♂♂ 4 ♀♀ CNU). Gyeongsangnam-do: Jangmok-myeon, Geoje-si, 21.vii.2009, JS. Park (3 ♀♀ NIBR); Mt. Sanbang, Sanbang-ri, Dundeok-myeon, Geoje-si, 7.v.2010, HJ. Kim (1 ♂ NIBR). Jeju-do: Mt. Sanbang, Sagye-ri, Andeok-myeon, Seogwipo-si, 21.viii.2011, SH. Jung (1 ♂ 4 ♀♀ NIBR); Nokgome, Jangjeon-ri, Aewol-eup, Jeju-si, 18.vi.2011, SH. Jung (1 ♂ 1 ♀ NIBR); Gwakji-ri, Aewol-eup, Jeju-si, 17.ix.2011, SH. Jung (1 ♂ NIBR); Ora-dong, Jeju-si, 26.viii.2007, JL. Kim (3 ♂♂ 11 ♀♀ NIBR); Hyeopjae-ri, Hallim-eup, Jeju-si, 5.ix.2011, SW. Cheong (4 ♂♂ 1 ♀ NIBR); Jongdal-ri, Gujwa-eup, Jeju-si, 2.ix.2011, SW. Cheong (5 ♀♀ NIBR); Noro-oreum, Yusuam-ri, Aewoleup, Jeju-si, 11.xii.2003, Y. Kwon (2 ♂♂ 2 ♀♀ NIBR). Jeollanam-do: Sina-ri, Jinwol-myeon, Gwangyang-si, 13.ix.2010, J.A. Jeon (1 ♂ NIBR); Gohyeon-ri, Hyeonsan-myeon, Haenam-gun, 12.ix.2012, J.A. Jeon (1 ♀ NIBR).
Distribution. Korea, China, Japan, Taiwan.
Bionomics. This species is widely distributed in South Korea and it was collected on various species of Araliaceae (Kwon et al. 2001, present study); host plants belonging to the same family were reported from Japan (Yamamoto 2003).
Remarks. Some of the earlier records of Elasmostethus nubilus and E. humeralis from South Korea are apparently based on misidentification and pertain to E. rotundus and E. yunnanus. For example, fig. 82 in plate 10 of Lee (1971), labeled as E. nubilus, apparently represents a female of E. yunnanus.
description: Published as part of Jung, Sunghoon, 2017, Review of the genus Elasmostethus (Hemiptera: Heteroptera: Acanthosomatidae) from the Korean Peninsula, pp. 351-365 in Zootaxa 4320 (2) on page 356, DOI: 10.11646/zootaxa.4320.2.9, http://zenodo.org/record/891940