Elasmostethus nubilus (Dallas)

Yamamoto, A., 2003, A revision of Japanese Elasmostethus Fieber (Heteroptera: Acanthosomatidae), Tijdschrift voor Entomologie 146 (1), pp. 49-66 : 63

publication ID

https://doi.org/10.1163/22119434-900000119

persistent identifier

https://treatment.plazi.org/id/F939396D-FFF7-A77A-7AED-8E07FF6BFEB1

treatment provided by

Luisschmitz

scientific name

Elasmostethus nubilus (Dallas)
status

 

Elasmostethus nubilus (Dallas) View in CoL

( figs. 38, 40-41, 44, 46, 48-49)

Acanthosoma nubilus Dallas, 1851: 305 .

Dichobothrium nubilum – Horváth, 1912: 608; Ishihara, 1935: 264; Miyamoto & Yasunaga, 1989: 188.

Elasmostethus nubilum – Higuchi & Sato, 1988: 51.

Redescription. – Body ovoid, comparatively small; dorsal surface green with dark red markings, densely dark punctate; ventral surface greenish yellow, reddish on posterior end. Head green, with a few small punctures on vertex; basal part of tylus with a pair of fuscous narrow stripes. Antenna green, with dark segments IV, V and apical ⅔ of III. Rostrum greenish yellow with fuscous apex, usually reaching to hind coxae. Pronotum green, densely punctate except for calli; humeral angle triangularly projected, broadly infuscate. Scutellum pale green, partly fuscous or tinged dark red basally and with pale basal corners and apex, densely punctate. Corium translucent, green, partly fuscous or tinged dark red along claval and membranal margin, with a small and obscure, fuscous spot near apex of vein R+M, densely punctate except along R+M vein sparser; apical corner broadly infuscate; clavus red, densely punctate; membrane hyaline, with a distinct fuscous marking at middle of costal margin. Femur greenish yellow, slightly darkened apically and with a small basal tubercle in male; tibia green, brownish apically; tarsus brown, darkened on apex of tarsomere II; apex of claw fuscous. Abdominal terga I- II black; III- VII greenish yellow, fuscous or tinged dark red on broad median region. Connexiva greenish yellow, reddish on apex of segment VII. Sterna greenish yellow, impunctate, lacking dark spots but in females often with a pair of fuscous spots on segment VII; apical corner of segment VII strongly acute, usually extending beyond posterior margin of genital segments; Pendergrast’s organs semicircular ( fig. 46).

Male genitalia: Genital capsule opening dorsoposteriorly; sides nearly straight in dorsal view; ventral rim slightly rounded, furnished with dense long setae except at middle, lower and upper tufts lacking; dorsal rim with narrowly V- shaped thin protrusion; infolding of dorsal rim broadly covered with short setae; proctiger strongly reflexed apically ( figs. 40-41); paramere broadened apically and with a triangular inner projection and an obtuse outer angle on apical part ( fig. 44); phallotheca lacking dorsal diverticulum; conjunctival sheath with reduced dorsal lobe; vesica remarkably inflated, fusiform ( figs. 48-49).

Female genitalia: Posterior margin of genital segments VIII rounded and with a slight median emargination ( fig. 46).

Dimensions. – 3/ ♀: Body length 6.92-9.10 (8.26)/7.55-10.10 (9.13); width of head including eyes 1.45-1.66 (1.56)/1.45-1.73 (1.64); length of antennal segments I 0.55-0.69 (0.61)/0.48-0.66 (0.60), II 1.00- 1.38 (1.20)/0.90-1.24 (1.10), III 0.86-1.10 (0.98)/ 0.76-0.97 (0.89), IV 1.21-1.48 (1.33)/1.10-1.38 (1.26), V 1.07-1.21 (1.15)/1.00-1.21 (1.12); width of pronotum 3.45-4.55 (4.13)/3.80-5.18 (4.63); width of scutellum 1.86-2.48 (2.24)/2.00-2.83 (2.54); length of scutellum 2.21-2.97 (2.67)/2.42-3.24 (2.98); length of fore femur 1.52-1.86 (1.74)/1.52-2.07 (1.77), fore tibia 1.59-1.86 (1.73)/1.45-1.93 (1.71), middle femur 1.73-2.21 (1.96)/1.38-2.28 (2.04), middle tibia 1.73- 2.14 (1.91)/1.52-2.28 (1.95), hind femur 1.93-2.48 (2.33)/2.00-2.76 (2.48), hind tibia 2.07-2.69 (2.45)/ 1.93-2.69 (2.40).

Distribution. – Japan (Honshu, Shikoku, Kyushu, Sado Is., Tsushima Is., Yakushima Is., Amami-Oshima Is., Okinawa Is., Ishigaki Is., Iriomote Is.); China, Korea.

Biology. – This species is known to feed on many araliaceous plants. I have confirmed the following plants as hosts in Japan: Aralia cordata Thunb., Acanthopanaxs ciadophylloides (Fr. & Sav.) and Hedera rhombea (Miq.) . This species is widespread in the lowland to montane zone in Japan except for Hokkaido.

Remarks. – This species is characterized by the small spot central on the corium, immaculate abdominal sterna except on segment VII, long setae on the ventral rim and the absence of upper and lower tufts in the male genitalia ( figs. 40-41), and the slight median emargination in the rounded posterior margin of the female genitalia ( fig. 46).

Material examined . – JAPAN: Honshu: 5♀, Mt. Kinpokusan , Sado Is., Niigata Pref., 11.ix.1969, S. Hisamatsu ( EUM) ; 2♀, Okutama , Tokyo Metrop., 2.v.1976, K. Haga ( SEHU) ; 1♀, Hakone Mts. , Kanagawa Pref., 17.vi.1939, H. Hasegawa ( NIAS) ; 73 5♀, Mt . Hira-san , Otsu, Shiga Pref., 10.ix.1995, A. Yamamoto ( OMO) ; 1♀, Asiu , Miyama, Kyoto Pref., 12.xii.1978, Kitamura ( SEHU) ; 1♀, Mt . Takahatayama , Tanabe, Wakayama Pref., 16.ix.1996, S. Goto ( OMO) ; 213 18♀, Toyo-oka , Hyogo Pref., 14.x.1987, S. Kudo ( SEHU) . – Shikoku: 13 1♀, Sugitate , Matsuyama, Ehime Pref., 9.ii.1953, K. Sasaki ; 13, Mt. Saraga-mine , Ehime Pref., 27.vi.1959, M. Sato ( EUM) . – Kyushu: 13 4♀, Mt. Gokahara , Nagasaki Pref., 18.viii.1986, T. Yasunaga ( OMO) ; 43 3♀, Izuhara , Tsushima Is., Nagasaki Pref., 25.viii.1966, S. Nomoto ( EUM) ; 23 1♀, Mt. Kirishima , Kagoshima Pref., 31.viii.1929, M. Yano ( NIAS) ; 13, Mugio , Yakushima Is., Kagoshima Pref., 18.iii.1974, T. Ishihara ; 3♀, Mt. Miyanoura-dake , Yakushima Is., Kagoshima Pref., 28.xii. 1972, K. Ito ( EUM) . – Ryukyu Is.: 13 3♀, Mt. Yuwan-dake , Amami-Oshima Is., 29.vii.1963, J. L. Gressitt ( NIAS) ; 193 20♀, Terukubi-rindo , Kunigami, Okinawa Is., 19.iv.1986, T. Yasunaga ; 23 2♀, Mt. Fukai-Omoto-dake , Ishigaki Is., 23.iv.2002, A. Yamamoto ; 53 14♀, Funaura , Iriomote Is., 2-3.x.2001, K. Sugishima ( OMO) . – CHINA: 13, Fo-chow , Fu-kien, 30.iv.1965, L. Wang ; 1♀, same locality, 4.v.1965, L. Wang ( NUT) . – KOREA: 13 1♀, Mt. Paikwoon , Okryongmyon, Kwangyang, Chollanam-do, 4. 5.viii.1994, S. Yoshimatsu ( NIAS) .

EUM

EUM

SEHU

SEHU

NIAS

NIAS

OMO

OMO

NUT

NUT

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Acanthosomatidae

Genus

Elasmostethus

Loc

Elasmostethus nubilus (Dallas)

Yamamoto, A. 2003
2003
Loc

Acanthosoma nubilus

Dallas 1851: 305
1851
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