Lineostethus sinuosus Kochenborger & Garbelotto, 2018

Garbelotto, Thereza de Almeida, Kochenborger, Ana Paula Leite & Campos, Luiz Alexandre, 2018, Revision of Lineostethus (Heteroptera: Pentatomidae: Discocephalini), Zoologia (e 21232) 35, pp. 1-24 : 14-16

Lineostethus sinuosus Kochenborger & Garbelotto , sp. nov.

http://zoobank.org/ 3786A48C-3F2B-4137-B1EC-EEBC72E9EC99

Figs 5, 45–53, 78

Diagnosis. The males of L. sinuosus sp. nov. differ from other species by the subrectangular expansions of the dorsal rim of pygophore, though it is similar in shape with L. marginellus whose dorsal rim cutting is wider ( Figs 27, 45: fdr). The median portion of the projections of the superior layer of ventral rim in L. sinuosus sp. nov. is also the widest among the species with projections spatulate at apex ( Fig. 47: psl). The females of L. sinuosus sp. nov. can be recognized by the sinuous posterior margin of gonocoxites VIII ( Figs 51–52: gcVIII), and although a sinuous outline is also observed in L. otarus sp. nov. and L. auritus sp. nov. ( Figs 68, 76: gcVIII), the strongly divergent sutural angles are exclusive to L. sinuosus sp. nov. The shape of the thickening of the gonapophyses VIII is also exclusive inside the genus, and along with the helicoid distal ductus receptaculi is diagnostic to the species.

Description. Antennae ivory; segments II–III with longitudinal brown lines. Anterolateral margins of pronotum and proximal portion of lateral margin of corium punctured in some specimens. Unpunctured area laterad to the apex of radial vein of coria smaller to subequal to the width of one eye. Hemelytral membrane at least reaching the apex of abdomen, with 6 veins. Ventrally, punctures sparse and laterally concentrated. Femora with brown circular spots on distal half.

Male genitalia. Foliaceous expansions of dorsal rim subrectangular; apex of expansions at least reaching the posterior limit of ventral rim; posterolateral angles visible dorsally ( Fig. 45: fdr, pa). Basal impression of the foliaceous expansions subrectilinear; cutting of dorsal rim U-shaped ( Fig. 45: bi, dr). Posterolateral angles rounded, apex obtuse, sometimes with setae on posterior margin ( Figs 45–46: pa). Segment X visible on the cutting of dorsal rim ( Fig. 45: dr, X). Margin of the superior layer of ventral rim sinuous, median excavation U-shaped ( Fig. 46: vr). Margin of the inferior layer of ventral rim with one arc of short bristles ( Figs 46–47: b). Projections of the superior layer of ventral rim spatulate at apex, forming a right angle with the posterolateral angles; dorsal margin convex and ventral margin sinuous, median third enlarged in relation to the lateral thirds; setae on the posterior margin of the projections ( Fig. 47: psl). Parameres sinuous, parallel to segment X, apex reaching the mesial margin of the foliaceous expansions of the dorsal rim; head lozenge ( Figs 47–49: par, X, dr). Ventral surface of phallotheca subrectilinear ( Fig. 50: ph, ap). Vesica obtuse and more sclerotized at apex; apical margin concave, extending to basal 1/3 of ductus seminis distalis ( Fig. 50: v, av, ds). Distal portion of the ductus seminis distalis about 2/3 of vesica length, narrowing posteriorly ( Fig. 50: ds).

Female genitalia. Posterior margin of urosternite VII concave ( Figs 51–52: VII). Gonocoxites VIII subtriangular; sutural margins diverging towards apex, sutural angles posteriorly projected; posterior margin sinuous, varying in intensity ( Figs 51–52: gcVIII) with the sinuosity of the posterior margins, sometimes with lateral angles partially hiding the spiracles of the laterotergites VIII, and sutural angles projected over the base of the laterotergites IX, or not. Posterior margin of laterotergites VIII convex; limit between laterotergites VIII and tergite VIII indistinguishable ( Figs 51–52: la8). Posterior margin of gonocoxites IX subrectilinear ( Fig. 51: gcIX) to convex ( Fig. 52: gcIX). Gonapophyses VIII visible and smooth ( Figs 51–52: gpVIII). Laterotergites IX digitiform, with a median depression; varying in shape from lateral margins convex with apex rounded to lateral margins subrectilinear with apex acute ( Figs 51–52: la9). Posterior margin of segment X subrectilinear ( Figs 51–52:X). Thickening of gonapophyses IX sinuous, surpassing the lateral margin of the thickening of vaginal intima ( Fig. 53: gpIX, tgIX). Thickening of vaginal intima subtriangular, flat ( Fig.53: vi). Distal portion of ductus receptaculi helicoid ( Fig. 53: ddr); anterior annular crest turned to ductus receptaculi; pars intermedialis subequal in length to capsula seminalis; posterior annular crest turned to pars intermedialis ( Fig. 53: pi, cs).

Measurements. Male (n = 5): head length, 1.54 ± 0,07 (1.48–1.63); width, 2.98 ± 0.13 (2.79–3.16); length of antennal segments: I, 0.42 ± 0.03 (0.38–0.44); II, 0.68 ± 0.02 (0.66–0.70); III, 0.69 ± 0.08 (0.62–0.78); IV, 0.80; V, 0.96; length of labial segments: I, 0.67 ± 0.06 (0.62–0.76); II, 1.50 ± 0.05 (1.44–1.56); III, 0.61 ± 0.04 (0.56–0.68); IV, 0.48 ± 0.07 (0.42–0.60); pronotum length, 1.75 ± 0.09 (1.64–1.84); width, 4.00 ± 0.16 (3.76–4.15); scutellum length, 3.38 ± 0.21 (3.07–3.64); width, 2.66 ± 0.12 (2.48–2.82); total length, 6.43 ± 0.31 (6.11–6.82); abdominal width, 4.45 ± 0.22 (4.20–4.70).

Female (n = 5): head length, 1.49 ± 0.10 (1.32–1.58); width, 2.99 ± 0.20 (2.67–3.20); length of antennal segments: I, 0.40 ± 0.02 (0.38–0.42); II, 0.73 ± 0.10 (0.62–0.82); III, 0.64 ± 0.06 (0.54–0.70); IV, 0.81 ± 0.09 (0.70–0.90); V, 0.98 ± 0.07 (0.88–1.04); length of labial segments: I, 0.68 ± 0.10 (0.58–0.78); II, 1.44 ± 0.10 (1.30–1.52); III, 0.64 ± 0.07 (0.56–0.70); IV, 0.47 ± 0.04 (0.44–0.52); pronotum length, 1.76 ± 0.09 (1.60–1.82); width, 4.05 ± 0.26 (3.64–4.25); scutellum length, 3.35 ± 0.13 (3.13–3.48); width, 2.63 ± 0.12 (2.45–2.79); total length, 6.68 ± 0.37 (6.04–7.03); abdominal width, 4.44 ± 0.31 (3.92–4.75).

Type material. Holotype (male): MEXICO, Yucatán: Puerto Chicxulub ( Convolvulaceae ), 25-XI-2011, Jean-Luc Dzido leg. (deposited in: DZUP) . Paratypes: MEXICO, Yucatán: (12 km N Quintana Roo, Hwy 295), 1 male and 2 females, 20-V-1987, D.A. Rider E.G. & T.J. Riley leg. ( DARC) ; Chichen-Itza , 1 female, 16- VII-1952, J. & D. Pallister leg. ( AMNH) ; Quintana Roo: ChichénItzá , 2 males, 10-VIII-1990, D.A. Rider leg. (1 male UFRG and 1 male DARC) ; Coba , 1 male, 11-VIII-1990, D.A. Rider leg. ( DARC); (45 mi W Chetumal) , 3 females, 9-VIII-1974, C.W. & L.O’Brien & Marshall leg. (1 female UFRG and 2 females DARC) . BELIZE: (H?25), 1 male, no date ( CAS); (Belize Mile 36 Northern Road ) , 1 male and 1 female, 11-VIII-1977, C.W. & L. O’Brien & Marshall leg. ( AMNH) . HONDURAS, Cortes: ( 5 km N Cofradia ), 1 male, 5-VIII-1977, C.W. & L.B. O’Brien & Marshall leg. ( AMNH) .

Distribution ( Fig. 78). Mexico: Yucatán, Quintana Roo; Belize; Honduras: Cortes.

Etymology. The epithet refers to the shape of the females’ gonocoxites VIII; Latin adjective masculine, sinuosus (-a, -um) = full of bendings, windings.

Remarks. From the data retrieved of specimens’ labels, Convolvulaceae are possible host plants.