Xynocoris ecuadorensis, Campos, Luiz Alexandre & Roell, Talita, 2017

Campos, Luiz Alexandre & Roell, Talita, 2017, Description of four new species of Ochlerini from South America (Hemiptera: Pentatomidae: Discocephalinae), Zootaxa 4236 (3), pp. 507-520 : 517-519

Xynocoris ecuadorensis sp. nov.

( Figs. 9 , 10 )

Etymology. The epithet refers to the country of the type locality, Ecuador.

Type locality. Ecuador, Orellana, Coca (coordinates -0.2861, -77.1016).

Female Holotype. Labels: Ecuador, Orellana, Coca, Palmar del Rio , 1-15/X/2015, R. Asipuela col., on OxG hybrids ( Elaeis oleifera x Elaeis guineensis ) ( DZUP).

Paratypes: 0 3 females. Same data as holotype (1 female DZUP; 2 females UFRG).

Description. Body oval, dark brown, anterior angles of pronotum expanded anteriorly. Head subtriangular, wider than long, punctures confluent, forming wrinkles, denser on the base of mandibular plates. Mandibular plates little longer than clypeus, convergent towards the apex, dorsally reflexed, separated by clypeus. Anteocular processes acute, laterally directed. Eyes on short peduncle. Width of each eye less than half the interocular distance, ocelli posterior to an imaginary line connecting the hind margins of eyes. Antennae five segmented, with thin setae on all antennomeres, denser on the fourth and fifth, base of the fifth antennomere yellowish. Proportion of antennomeres: I<II<III<IV<V. Antennal tubercles visible from above, acute apically. Labium apex reaching the fourth abdominal segment. Proportion of labial segments: I<II>III>IV.

Pronotum trapezoidal, wider than long; punctures sparse, forming wrinkles; cicatrices with a median tubercle. Anterior margin sinuous, concave in the median third, anterolateral margins crenulated, reflexed, strongly concave, expanded subapically in 1+1 acute rounded projections anteriorly directed, surpassing the lateral margins of eyes. Humeral angles not produced ( Fig. 9 D).

Scutellum longer than wide, reaching the imaginary line connecting the apical angles of connexivum V; frenal margins little longer than postfrenal margins. Punctures forming wrinkles on disc. Corium longer than scutellum, reaching connexival segment VI; anterior ¼ of lateral margins slightly crenulated; punctures smaller than on pronotum and scutellum, not forming wrinkles; 1+1 yellowish spot at apex of radial vein; membrane little surpassing the apex of abdomen. Meso- and metasternum carinate along their length. Pro-, meso-, and metapleura punctured; metapleural evaporatorium extending less than half the distance to the lateral margin of metapleuron. Peritreme spout-shaped. Tibiae sulcated dorsally, with lateral and ventral setae, denser at apex.

Measurements. (n=4) head length 1.41 ± 0.08 (1.30–1.50); width 1.98 ± 0.10 (1.09–2.01); interocular distance 1.10 ± 0.01 (1.10–1.12); pronotum length 2.24 ± 0.10 (2.08–2.31); width 4.42 ± 0.06 (4.35–4.5); scutellum length 3.15 ± 0.12 (3.00–3.25); width 2.73 ± 0.06 (2.64–2.80); length of antennomeres: I 0.47 ± 0.06 (0.40–0.54), II 0.59 ± 0.02 (0.56–0.6), III 0.71 ± 0.02 (0.70–0.74), IV 0.75 ± 0.05 (0.70–0.80), V 1.26 ± 0.04 (1.20–1.30); length of labium segments: I 0.77 ± 0.01 (0.77–0.80), II 1.31 ± 0.08 (1.24–1.39); III 0.82 ± 0.07 (0.77–0.93), IV 0.72 ± 0.03 (0.68–0.75); length of abdomen 3.90 ± 0.12 (3.75–4.00); width 4.61 ± 0.16 (4.50–4.85); total length 7.17 ± 0.54 (6.88–8.00).

Female genitalia. Gonocoxites VIII longer than wide; posterior margins convex; middle projected over laterotergites IX and posterolateral corner projected over laterotergites VIII; disc with low callus closer to posterior margin ( Fig. 10 B, gcVIII). Laterotergites VIII wider than long, bearing shallow punctures ( Fig. 10 B, laVIII). Gonocoxites IX lozenge, longitudinal suture conspicuous ( Fig. 10 B, gcIX). Laterotergites IX reaching the band connecting laterotergites VIII ( Fig. 10 B, laIX). Thickening of vaginal intima subtriangular ( Fig. 10 A, vi). Ductus receptaculi proximal to the vesicular area as wide as the median duct ( Fig. 10 A, dr, md); length of vesicular area about 2.5 times the length of pars intermedialis plus capsula seminalis ( Fig. 10 A, pi, cs). Length of tubular portion of ductus receptaculi distal to the vesicular area equals 0.4 times the length of vesicular area. Pars intermedialis cylindrical, about five times longer than capsula seminalis, the latter bearing apical convoluted and slender processes as long as pars intermedialis ( Fig. 10 A, pi, cs).

Male unknown.

Comments. The new species is described in Xynocoris Garbelotto & Campos based on the acute anteocular processes, the calloused gonocoxites 8, the anterior margin of gonocoxites 9 emarginated, and the large thickening of gonapophyses 9 bearing lateral projections. Xynocoris ecuadorensis keys to X. calosus Garbelotto & Campos in the key by Garbelotto et al. (2014), the new species being easily distinguished from X. calosus by the shape of pronotum, and by the posterior margins of gonocoxites 8. A similar pronotum to that of X. ecuadorensis is seen in Xynocoris crinitus Garbelotto & Campos , and though the latter is known only from males it can be readily separated from X. ecuadorensis by the four-segmented antennae. The genital plates in the new species are more similar to those in Xynocoris egeri Garbelotto & Campos , but they can be separated by the shape of pronotum and by the presence of pedunculated eyes in X. ecuadorensis . This is the second species of Xynocoris recorded in Ecuador, the other is the type species Xynocoris parvus (Distant) ( Garbelotto et al. 2014) .

Note: all specimens of Xynocoris ecuadorensis sp. nov. were collected on oil palms (OxG hybrids, Elaeis oleifera x Elaeis guineensis ) affected by the lethal wilt (marchitez sorpresiva) disease.

Figures

FIGURE 9. Xynocoris ecuadorensis sp. nov., female holotype, A – C, dorsal, ventral and lateral view respectively; D, head and pronotum, dorsal. Scale bars = 1 mm.

FIGURE 10. Xynocoris ecuadorensis sp. nov., female, A, C, D, receptaculum seminis and ectodermal genital ducts, ventral. B, genital plates, posterior. Abbreviations: cp, conical projections; cs, capsula seminalis; dr, ductus receptaculi proximal; gcVIII, gonocoxites VIII; gcIX, gonocoxites IX; gpIX, gonapophyses IX; id, inner duct of vesicular area; laVIII, laterotergites VIII; laIX, laterotergites IX; md, median duct of vesicular area; od, outer duct of vesicular area; pi, pars intermedialis; vi, thickening of vaginal intima. Scale bars: A, C, D, 0.5 mm; B, 1 mm.