Eurystylopsis Poppius

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 : 319-320

Genus Eurystylopsis Poppius

Eurystylopsis Poppius, 1911: 18 (n. gen.), type species: Eurystylopsis longipennis Poppius, 1911: 19 ( INDIA: Darjeeling ), original designation; Schuh , 1995: 765 (cat.); Kerzhner & Josifov , 1999: 98 (cat.); Zheng et al., 2004: 264 (diag., key to Chinese spp.); Schuh (2002–2014) online catalog.

Eurystylomorpha Poppius, 1915: 16 (n. gen.), type species: Eurystylomorpha crassicornis Poppius, 1915: 17 ( TAIWAN: Fuhosho ), original designation; Schuh , 1995: 765 (cat.); Kerzhner & Josifov , 1999: 98 (cat.); Zheng et al., 2004: 262 (diag.); Schuh (2002–2014) online catalog. n. syn.

Diagnosis. Eurystylopsis is distinguished from other mirine genera by a combination of the following characters: Body elongate ovoid, not much tumid nor boxlike; basic coloration dark to reddish brown; general coloration and size more or less sexually dimorphic (as in E. clavicornis , Figs. 8 H–I, 9A–B); antennal segment II clavate, apparently longer than basal width of pronotum, with its apical part more than twice as thick as base; segments III and IV short, filiform; pronotum often with a few dark stripes in female (9B–D); collar narrow, about as thick as base of antennal segment II; scutellum moderately (as in E. clavicornis , Fig. 9 A–B) or sometimes strongly (as in E. harmandi , Fig. 9 B–E) swollen; legs long; left paramere C-shaped, weakly constricted subapically ( Fig. 10 A); right paramere short, straight ( Fig. 10 B); endosoma with notched sclerites and rather small, thick-rimmed secondary gonopore ( Fig. 10 C); female bursa copulatrix with thick-rimmed, large sclerotized ring (10D); and posterior wall with developed, T- or Y-shaped dorsal structure and bilobate interramal lobe ( Fig. 10 E).

Distribution. China, India, Nepal and Taiwan.

Discussion. This genus is considered to be the most closely related taxon to Eurystylus . Two species were found to be associated with inflorescences of chestnut, Castanea sp. and orange, Citrus sp. ( Eurystylopsis clavicornis ) and an undetermined broadleaf ( Ep. hermandi , Fig. 9 C–D) in Nepal. These observations may imply a relationship between Eurystylus and Eurystylopsis .

Poppius (1915) described a new genus Eurystylomorpha to accommodate a single species, Em. crassicornis ( Fig. 8 D) from Taiwan, comparing it with Eurystylus only. We find it mysterious that he (loc. cit.) did not mention his own genus Eurystylopsis proposed for two Himalayan species just four years prior ( Poppius, 1911). We imagine that Poppius did not included Eurystylopsis because the geographical distribution of the genera in India and Taiwan are remotely disjunct. However, four additional species were subsequently described from continental China ( Zheng & Chen, 1991; Zheng et al., 2004). We have also found E. clavicornis distributed in Nepal and Thailand, which could connect the distribution range for the genus. Both nominal genera share numerous character states, except for the carina on vertex (absent in Eurystylopsis ; thin but complete in Eurystylomorpha ), the overlapping of mesoscutum, and the coloration of dorsal pilosity. These minor differences are now considered insufficient to recognize them as two independent genera. We therefore suggest a new subjective synonymy, Eurystylopsis Poppius, 1911 = Eurystylomorpha Poppius, 1915 . Accordingly, Eurystylopsis is now known widely from the Oriental to eastern Palearctic regions.

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.