Emesopsis konchurangensis Truong, 2019

Lam, Truong Xuan, 2019, A new species of the emesine assassin bug genus Emesopsis (Hemiptera: Heteroptera: Reduviidae) from Vietnam, Zootaxa 4608 (2), pp. 365-370 : 365-370

Emesopsis konchurangensis Truong , sp. nov.

( Figs 1–13 )

Male. Measurement (in mm) [holotype; body length both holotype and paratypes]: Body length 5.37–5.66. Head length 0.68; anteoculus 0.18; postoculus 0.20; interocular space 0.19; width across eyes 0.54. Antenna length 7.24; length of antennal segments I–IV = 3.29, 2.59, 1.06, 0.30. Rostrum length 0.80; length of rostral segments I–III = 0.38, 0.18, 0.24. Pronotum length 0.95; width across humeri 0.65. Scutellum length 0.23. Lengths of femur, tibia and tarsus of forelegs 1.72, 1.30, 0.18; of midlegs 2.66, 3.38, 0.09; of hindlegs 4.44, 5.53, 0.11, respectively. Lengths of coxa and trochanter of forelegs 0.96, 0.24. Hemelytron length 4.81. Abdomen length 3.62.

Coloration ( Figs 2–7 ): Body generally dark brown. Compound eyes reddish. Dorsum of head and disc of pronotum yellowish brown. Antennal segment I brown on dorsum and dark brown on venter, with narrow annulations dark brown; segments II to IV brownish yellow. Rostrum brown, with basal part of segment I, venter of segment II, and apical part of segment III dark brown. Forelegs ( Fig. 4 ) brownish; trochanter and apical part of coxa dark brown; femur light brown in apical part, with approximately 5 incomplete annulations dark brown; tibia with dark brown annulations on subbasal, median, and apical parts. Mid- and hindlegs brownish; femur light brown on subapical part, with approximately 4 annulations dark brown; tibia with annulations in subapical part dark brown; tarsus dark brown. Hemelytron ( Fig. 5 ) light brown, mottled with several irregular dark brown spots; dark brown spots within discal cell rarely bordered; largest brown spot within discal cell darker than others, situated near apex of discal cell, conspicuous when hemelytra held on abdomen; longitudinal area between Cu and PCu veins dark brown; area proximal to discal cell decorated with 10–14 short, transverse, vein-like markings dark brown. Abdomen dark brown, with apical part pale brown.

Structure: Head ( Figs 1–3 ) elliptical, furnished with long suberect setae, densely intermixed with short reclining setae; anteoculus 0.9 times as long as postoculus; interocular furrow almost straight; surface of anteoculus slightly bulged at middle portion. Compound eyes ( Figs 1 , 2 ) large, prominent laterad, not reaching level of ventral surface of head, approximately as wide as interocular space in dorsal view. Antennae ( Fig. 1 ) slender; segment I covered with short, curved, suberect setae; longest setae of these 1.5 times as long as width of segment I; segment II with short, suberect or reclining setae; segments III and IV furnished with short, suberect or reclining setae; proportion of segments I to IV 11: 9: 4: 1. Rostrum ( Fig. 3 ) slightly curved; segment I covered with short, curved, suberect setae on outer surface, shorter than segments II and III combined; segments II and III covered with short suberect setae; proportion of segments I to III 4: 2: 3.

Pronotum ( Figs 1–3 ) 1.4 times as long as head, 1.5 times as long as width across humeri, covered with long suberect setae, intermixed with woolly reclining setae; anterior lobe approximately 0.8 times as long as its maximum width; posterior lobe approximately 0.9 times as long as humeral width, 1.6 times as long as anterior lobe; posterior angle bulged, with anteriorly arcuate posterior margin. Scutellum approximately 1.1 times as long as its maximum width of visible part, with large spine apically ( Figs 1 , 2 ). Metanotal spine long, erect.

Forelegs ( Figs 1 , 4 ) densely furnished with short, reclining or suberect setae; coxa 8 times as long as its maximum width; femur 1.8 times as long as coxa, 7 times as long as trochanter, 12 times as long as its maximum width, with anteroventral and posteroventral series of 1 large, 3 medium-sized, and approximately 60 short to small spines; basal most spine of posteroventral series largest, half as long as maximum width of femur; tibia 0.8 times as long as femur; tarsus two-segmented, 0.15 times as long as tibia. Mid- and hindlegs ( Fig. 1 ) slender; femora with short suberect setae; tibiae with short reclining setae. Hemelytra ( Figs 1 , 5 ) exceeding posterior apex of abdomen; basal cell relatively large, nearly rectangular; M and Cu veins proximal to discal cell not forming elongate subbasal cell; M vein distal to discal cell lacking bifurcate branch.

Abdomen with short, reclining or suberect setae; tergite I+II with erect spine. Posterior process of genital capsule ( Figs 8, 9 ) long, spine-shaped, weakly curved upward, acute at apex. Paramere ( Figs 6–10 ) long, slender in basal half, widened in apical half in lateral view, curved inward in apical half, pointed at apex, with erect and suberect setae variable in length. Endosoma of phallus ( Figs 11–13 ) symmetrical, ventrally provided with a pair of short, conical, apically sclerotized expansions in addition to a pair of vesica arms. Vesica arms ( Figs 11–13 ) generally slender, ventrally sclerotized, somewhat widened in middle part, tapering and sigmoidally curved in apical half, acute at apex.

Female. General appearance as in male. Body length 5.21–5.48. Compound eyes 0.9 times as wide as interocular space in dorsal view. Posterior pronotal lobe 1.5 times as long as anterior pronotal lobe. Abdomen apically narrowed and rounded.

Type series. Holotype: male, Trai Trau , Kon Chu Rang Nature Reserve, Kbang, Gia Lai Prov., Vietnam, 14°13’10.5”N 108°36’24.3”E, ca. 742 m alt., 8.ix.2018, Truong Xuan Lam leg. Paratypes: same data as for holotype (8 males, 3 females) ; same locality and collector as for holotype but 4.ix.2018 (2 males) .

Distribution. Central Vietnam (Gia Lai Province).

Etymology. The specific epithet refers to its occurrence in Kon Chu Rang Nature Reserve, Gia Lai Province, central Vietnam; an adjective.

Remarks. This new species is very similar in general appearance to Emesopsis albispinosa from Vietnam and Thailand, but can be distinguished from the latter by the following characters: body length less than 5.7 mm (vs. more than 6.4 mm in E. albispinosa ), scutellar spine concolorous with scutellum (vs. whitish), paramere widened in apical half in lateral view (vs. slender throughout), and endosoma ventrally provided with a pair of short, conical, apically sclerotized expansions at base (vs. without such expansions). The new species also resembles in general habitus E. bifurcata from Vietnam and Thailand, but is separable from the latter by the following characters: paramere widened in apical half and not bent upward at apical 1/3 (vs. slender throughout and strongly bent in E. bifurcata ), endosoma symmetrical and ventrally provided with a pair of short, conical, apically sclerotized expansions at base (vs. asymmetrical and without such expansions), and apical half of vesica arms curved into S (vs. into C)

This new species was found on dead, drooping leaves of banana ( Musa sp., Musaceae ), growing in humid, more or less shady places. No other information is available on its biology.

Figures

FIGURE 1. Emesopsis konchurangensis sp. nov., male. Scale bar: 1 mm.

FIGURES 2–7. Emesopsis konchurangensis sp. nov., male. 2–3, head and pronotum; 4, profemur; 5, right hemelytron; 6–7, apical part of abdomen (genital capsule). 2, 6, dorsal view; 3, 4, 7, lateral view; 6, ventral view. Scale bars: 0.3 mm for Figs 2, 4; 0.2 mm for Fig. 5; 0.1 mm for Figs 3, 6, 7.

FIGURES 8–13. Emesopsis konchurangensis sp. nov., male. 8, genital capsule, ventral view; 9, genital capsule, lateral view; 10, right paramere, dorsal view; 11, phallus, lateral view; 12, phallus, ventral view; 13, phallus, dorsal view. Scale bars: 0.2 mm.