Lineostethus otarus Garbelotto & Kochenborger, 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 : 19-21

Lineostethus otarus Garbelotto & Kochenborger , sp. nov.

http://zoobank.org/ D6A205DB-7ECB-4C93-B813-2515E45876AA

Figs 7, 62–69, 78

Diagnosis. Lineostethus otarus sp. nov. and L. auritus sp. nov. share similar features in both male and female genitalia: the long foliaceous expansions of the dorsal rim of pygophore; two lines of bristles on the ventral wall, one of them not associated with punctures; and broad gonocoxites VIII. Lineostethus otarus sp. nov. is distinguished by the wider foliaceous expansions of the dorsal rim, hiding the posterolateral angles of pygophore; the sinuous proximal portion of the lateral margin of the expansions; and the projections of the superior layer of ventral rim more elongated. Females of L. otarus sp. nov. are distinguished by the posterior margin of urosternite VII subrectilinear over laterotergites IX, and the sinuous posterior margin of gonocoxites VIII.

Description. General color of the specimens with some variation, in melanic specimens margins of connexival segments with lines of black punctures more evident. Antennae ivory; segments II–III with longitudinal brown lines dorsally and ventrally; segments IV–V usually darker than the previous. Anterolateral margins of pronotum and proximal portion of lateral margin of corium punctured. Anterior margin of scutellum with two to four brown spots, and one ivory spot medially; post-frenal lobe with 1+1 lateral brown maculae. Unpunctured area laterad to the apex of radial vein of coria inconspicuous to equivalent to the width of one eye. Hemelytral membrane at least reaching apex of abdomen, with 6 veins. Ventrally, punctures uniformly distributed, absent on sterna. Femora with sparse brown circular spots on distal half.

Male genitalia. Foliaceous expansions of dorsal rim subrectangular, elongated, longer than wide, narrowing towards the apex; proximal portion of the lateral margin of expansions sinuous; apex rounded, surpassing the posterior limit of ventral rim by half of the expansion length, and visible dorsally when fixed at the specimen ( Fig. 62: fdr). Basal impression of the foliaceous expansions subrectilinear, cutting of dorsal rim subrectangular ( Fig. 62: bi, dr). Posterolateral angles acute and dorsally hidden by the dorsal rim expansions, covered by setae ( Figs 62–63: pa). Margin of the superior layer of ventral rim V-shaped, median excavation drop-shaped ( Fig. 63: vr). Margin of the inferior layer of ventral rim with two lines of short bristles: one posterior, subrectilinear and not associated with punctures; and another anterior, concave and associated with punctures ( Figs 63–64: b). Segment X with a line of setae on middle ( Fig. 62: X). Projections of the superior layer of ventral rim forming a right angle with the posterolateral angles, covered by setae; dorsal margin convex and ventral margin subrectlinear, elongated and uniformly wide throughout its length, apex acute and hook-shaped ( Fig. 64: psl, pa). Parameres parallel to segment X, at least reaching the foliaceous expansions of dorsal rim; head lozenge ( Figs 64–66: par, X, fdr). Ventral surface of phallotheca concave ( Fig. 67: ph, ap). Vesica apex subquadrangular; apical margin with a sclerotized contour, subrectilinear, and surpassing ductus seminis distalis ( Fig. 67: v, av, ds). Distal portion of ductus seminis distalis placed in a concavity on the middle of vesical, short and bending down ( Fig. 67: ds).

Female genitalia. Posterior margin of urosternite VII sinuous, middle third subrectilinear and lateral thirds convex ( Fig. 68: VII). Gonocoxites VIII subquadrangular, broad; posterior margin slightly sinuous, subrectilinear over laterotergites IX, with external angles truncated and weakly projecting over laterotergites VIII ( Fig. 68: gcVIII). Posterior margin of laterotergites VIII subrectilinear; limit between laterotergites VIII and tergite VIII indistinguishable ( Fig. 68: la8). Posterior margin of gonocoxites IX subrectilinear to convex ( Fig. 68: gcIX). Laterotergites IX digitiform, tumescent at apex; apex varying between rounded and slightly acute ( Fig. 68: la9). Posterior margin of segment X subrectilinear ( Fig. 68: X). Thickening of gonapophyses IX kidney-shaped, surpassing the lateral margin of the thickening of vaginal intima ( Fig. 69: gpIX, tgIX). Thickening of vaginal intima subquadrangular ( Fig. 69: vi). Distal portion of ductus receptaculi apically enlarged and more sclerotized ( Fig. 69: ddr); anterior annular crest turned to ductus receptaculi; pars intermedialis membranous at apex, longer than capsula seminalis; posterior annular crest perpendicular to pars intermedialis ( Fig. 69: pi, cs). Capsula seminalis shallowly constricted near base ( Fig. 69: cs).

Measurements. Male (n = 5): head length, 1.75 ± 0.06 (1.68–1.82); width, 3.13 ± 0.06 (3.04–3.20); length of antennal segments: I, 0.48 ± 0.02 (0.46–0.50); II, 0.73 ± 0.03 (0.70–0.78); III, 0.80 ± 0.01 (0.80–0.82); IV, 0.97 ± 0.09 (0.90–1.10); V, 1.06 ± 0.07 (0.98–1.12); length of labial segments: I, 0.76 ± 0.04 (0.72–0.80); II, 1.63 ± 0.11 (1.52–1.82); III, 0.72 ± 0.07 (0.66–0.84); IV, 0.53 ± 0.02 (0.50–0.54); pronotum length, 1.79 ± 0.07 (1.78–1.86); width, 4.41 ± 0.33 (4.20–4.98); scutellum length, 3.46 ± 0.15 (3.28–3.68); width, 2.74 ± 0.07 (2.67–2.84); total length, 8.16 ± 0.25 (7.80–8.40); abdominal width, 4.82 ± 0.10 (4.70–4.95).

Female (n = 5): head length, 1.81 ± 0.08 (1.72–1.92); width, 3.22 ± 0.11 (3.10–3.36); length of antennal segments: I, 0.49 ± 0.02 (0.48–0.52); II, 0.77 ± 0.05 (0.70–0.80); III, 0.82 ± 0.09 (0.72–0.92); IV, 0.97 ± 0.05 (0.92–1.02); V, 1.16 ± 0.04 (1.10–1.12); length of labial segments: I, 0.77 ± 0.10 (0.60–0.86); II, 1.40 ± 0.45 (0.60–1.70); III, 0.71 ± 0.08 (0.62–0.84); IV, 0.52 ± 0.04 (0.46–0.56); pronotum length, 1.82 ± 0.09 (1.82–1.94); width, 4.35 ± 0.21 (4.10–4.68); scutellum length, 3.54 ± 0.18 (3.28–3.68); width, 2.86 ± 0.14 (2.70–3.07); total length, 8.58 ± 0.30 (8.20–9.00); abdominal width, 4.94 ± 0.30 (4.55–5.36).

Type material. Holotype (male): MEXICO, Michoacán: (Hwy. 15, 21 mi E Morelia , 7000’), 15-VIII-1982, C.W. & L.O’Brien & G.Wibmer leg. ( AMNH) . Paratypes: MEXICO, Michoacán: ( Hwy 15, 21 mi E Morelia, 7000’), 8 males and 13 females, 15-VIII-1982, C.W. & L.O’Brien & G.B. Marshall leg. (1 male UFRG; 1 female AMNH; 7 males and 12 females DARC) ; Puebla: ( Hwy 18 mi NW Azumbilla, 7700’), 1 female, 14-V-1983, 1100’, C.W. & L.O’Brien & G.B. Marshall leg. ( UFRG) .

Distribution ( Fig. 78). México: Michoacán, Puebla ( Fig. 78).

Etymology. The epithet refers to the shape of the foliaceous expansions of dorsal rim of pygophore; adjective otarus (-a, -um), latinized from Greek otaros = large-eared.