Eurystylopsis crassicornis (Poppius) Poppius, 2017

Yasunaga, Tomohide, Nakatani, Yukinobu & Chérot, Frédéric, 2017, Review of the mirine plant bug genus Eurystylus Stål from Japan and Taiwan (Hemiptera: Heteroptera: Miridae: Mirinae), with descriptions of two new species, a new synonymy and a new combination, Zootaxa 4227 (3), pp. 301-324 : 320-323

Eurystylopsis crassicornis (Poppius) n. comb.

Figs. 8 D–F, 10D–E

Eurystylomorpha crassicornis Poppius, 1915: 17 (n. sp.); Schuh, 1995: 765 (cat.); Kerzhner & Josifov, 1999: 98 (cat.); Zheng et al., 2004: 263 (diag.); Schuh (2002–2014) online catalog.

Diagnosis. Recognized by its rather conventional mirine shape, generally dark, largely matte, elongate ovoid body; simple, reclining setae and silvery or partly golden pubescence on dorsum; basally constricted interramal lobe with narrowly sclerotized edge; and Y-shaped dorsal structure. This species (male and reddish female) is at first sight similar to E. clavicornis ( Figs. 8 H–I, 9A–B), from which E. crassicornis can be distinguished by the larger size, long antennal segment II longer than the metatibia, and thick-rimmed, squared sclerotized ring.

Description. Female: Similar to male, but dorsum sometimes partly or largely mottled with reddish patterns. Body generally dark brown, elongate ovoid; dorsal surface weakly shining, partly or largely tinged with red, with two types of vestiture: uniformly distributed, simple, short, brownish, reclining setae and densely distributed, silvery (party golden), reclining or semierect setae ( Fig. 10 C). Antenna dark brown; basal half of segment II reddish brown; bases of segments III and IV yellowish brown. Labium shiny chocolate brown, not exceeding apex of mesocoxa. Pronotum uniformly darkened, with narrowly pale basal margin (but in some specimens pronotum and scutellum largely reddish brown with fuscous stripes as in Fig. 9 B); scutellum with reddish apex, moderately tumid; pleura dark brown, with grayish yellow scent efferent system ( Fig. 8 F). Hemelytron uniformly dark brown, more or less tinged with red; median part of cuneus yellow; membrane smoky brown, with semitransparent, irregular maculae at middle. Coxae and legs dark brown; each trochanter pale brown; apical half parts of pro- and mesotibiae (except for dark apices) and median part of metatibia pale reddish or yellowish brown. Abdomen dark brown. Female genitalia ( Fig. 10 D–E): Genital chamber with distinct sclerotized perimeter surrounding lateral oviducts; sclerotized rings developed, rather squared ( Fig. 10 D); interramal lobes somewhat constricted basally, with narrowly sclerotized lateral margin ( Fig. 10 E).

Measurements. ♀: Total body length 5.8̄6.3; width of head across eyes 1.04̄1.09; width of vertex 0.43̄0.48; lengths of antennal segments ĪIV 0.95̄0.97, 2.66̄2.85, 0.95̄1.11, 0.58̄0.67; length of labium 1.99̄2.04; mesal length of pronotum including collar 1.23̄1.26; basal width of pronotum 1.99̄2.09; maximum width across hemelytron 2.28̄2.40; and length of metafemur, tibia and tarsus 2.47̄2.57, 3.41̄3.43, 0.64̄0.67. According to Poppius (1915), body length 6.2 and maximum width 2.2 in holotype male. Biology. Unknown.

Material examined. Holotype Ƌ, TAIWAN, Fuhosho [= current Samkiap , New Taipei City, 24.88, 121.39], H. Sauter (without USIs, image examined, Fig. 8 D). Additional material . TAIWAN: Nantou County: 1♀, Puli, Wushe, 24.02, 121.11, S. Gotoh ( TYCN) ; 2♀, same data except for date, 21 May 1989 , 1♀ with USIs (AMNH_PBI 00380487) (NMNS, TYCN); 2♀, Alishan Township , 20 May 1989, S. Gotoh ( NMNS, TYCN) .

Kaohsiung County: 2♀ , Taoyuan District, Tengihih National Forest Recreation Area , 23.06, 120.75, 12–13 May 1989, S. Gotoh, 1♀ with USIs ( AMNH _PBI 00380488) ( TYCN) .

Figures

FIGURE 8. Habitus images of dry-preserved specimens. A. Eurystylus coelestialium, lectotype male (upper) and paralectotype female mounted together (in 1998, MZHF). B. Male det. as E. luteus by Josifov from Pyongyang, North Korea (MZHF). C. E. sauteri, holotype female. D. Eurystylomorpha crassicornis, holotype male (Taiwan). E – F. Ditto, females in dorsal (E) and ventral (F) view. G. Ditto, scent efferent system. H. Eurystylopsis clavicornis, female from Kirtipur, Nepal (ventral view). I. Ditto, male. Scale bars 2 mm. Images (C & D) courtesy of J. F. Tsai and NMNS.

FIGURE 9. Habitus images of Eurystylopsis species (Nepal) & type specimens of E. harmandi (E) & Pseudeurystylus clavicornis (F). A. E. clavicornis in Kirtipur, Nepal (same individual of Fig. 8 G). B. E. clavicornis, female (= Fig. 8 H). C – D. Live individual probably corresponding to E. harmandi from Langtang Himal. E. E. harmandi, syntype female from India (Dardjiling) (MNHN). F. Pseudeurystylus clavicornis, holotype male from Australia (Sydney) (MZHF). Scale bars for (E & F) 1 mm.

FIGURE 10. Male (A – C) and female (D – E) genitalia of Eurystylopsis species. A – C. E. clavicornis. D – E. E. crassicornis. Scale bars 0.2 mm.