Ladeaschistus borgesi Bianchi, Cioato & Grazia

Cioato, Alana, Bianchi, Filipe Michels, Eger, Joseph & Grazia, Jocelia, 2015, New species of Euschistus (Euschistus) from Jamaica, Euschistus (Mitripus) and Ladeaschistus from southern South America (Hemiptera: Heteroptera: Pentatomidae: Pentatominae), Zootaxa 4048 (4), pp. 565-574 : 570-573

Ladeaschistus borgesi Bianchi, Cioato & Grazia sp. nov.

Etymology. Named in honor of Jorge Luis Borges, one of the most important writers from South-America. This late Argentinean writer is a milestone of literary fiction with his metaphysical tales, essays, and poetry.

Distribution. Argentina: Chaco, Salta, Tucumán; Bolivia: Santa Cruz; Brazil: Mato Grosso, São Paulo, Santa Catarina; Paraguay: Central, Horcheta.

Type material. Holotype ♂. BRAZIL, São Paulo: São José do Rio Preto (IBILCE-UNESP), 12.I.2009, Souza, H. V. col. [-20.7869, -49.3606] ( UFRG).

Paratypes. ARGENTINA, Chaco: 9 de julio. 1♂ 2♀, II.1996, O. E. Gonzalez col. ( FSCA). Charata, 1♂, XI.1994 to I.1995 ( DAR). Formosa. 1♂ (without abdomen), Martines, E. ( MACN). Salta: Urundel . 2♀ (one without abdomen), 25.I.1950, Golbach col. ( IFML). Tucumán: 1♂, II.1950, Wygo Coll. ( USNM). El Cadillal . 1♂ (without pygophore), 26.II.1966, Barrera, M. col. ( IFML). BOLIVIA, Santa Cruz: Sara ( Nueva Moka ). 1♂ (without pygophore) I.1963, Martinez, A. col. ( MZSP). 2♀ (one without abdomen), I.1963, Martinez, A. col. ( MZSP). BRAZIL, Mato Grosso: Cáceres . 1♂ (without pygophore), 10.III.1985, Elias, C. col. ( MZSP). Riacho do Herval ( Rio Paraná ). 3♀ (three without abdomen), ( MZSP). Ribeirãozinho . 1♂, 12.II.1962, Bechyné, J. col. ( MZSP). Três Lagoas , 2♂, 15.V.1964 ( MZSP). Santa Catarina: Guatambú ( FLONA de Chapecó ). 1♀, 18.IX.2004, Bianchi, F. M. col. [-27.0972, -52.7778] ( UFRG). São Paulo: São José do Rio Preto (IBILCE-UNESP) 4♂ (three without pygophore), 12.I.2009, Souza, H. V. col. [-20.7869, -49.3606] ( UFRG). 3♀ (two without abdomen), 12.I.2009, Souza, H. V. col. [-20.7869, -49.3606] ( UFRG). PARAGUAY, Central: Areguá . 1♂ 1♀, 10.V.2006, C. Aguilar col. ( JEEC). Central: Asunción . 1♂, 11–30.X.1990, G. Arrigada col. ( JEEC). Central: Capiatá . 1♀, 21.II.1994, G. Arrigada col. ( JEEC). Central, near Nemby, 1♂ 3♀, 11.I.1983, Coll. E. G. Riley ( DAR); Horqueta, 57-10, W. 23–24, N., 44 Kilim. East Paraguay Riv, 1♂, I.2.1936, Alberto Schulze, J. C. Lutz Collection 1961 ( USNM).

Description. Head: Longer than wide. Mandibular plates slightly surpassing clypeus, apices acuminate. Antennae variable, usually pale yellow, but presenting patterns of apex darker than base, in some specimens presenting dark bands at apex of III, IV and V segments. Bucculae evanescent at base of head. Rostrum slightly surpassing metacoxae.

Thorax: Anterolateral margins denticulate at least along anterior half, denticles pale yellow; Humeri varying from obtuse when undeveloped to acutely projected, directed laterad, but not forming a sharp spine; cicatrices of pronotum bearing callus at basal angles, concolorous. Scutellum with small fovea present at basal angles, sometimes flanked by whitish spot; medial whitish spot present on basal margin. Membrane of hemelytra fumose. Ventrally with dark spot at supracoxal cleft of each pleurite, plus at middle metaepimeron. Evaporatorium unpunctured, not reaching halfway between the ostiole and the lateral margin of metapleuron; peritreme spoutshaped. Metasternum carinate. Legs concolorous with ventral surface of thorax; femora armed with spine, small dark spot at base of each spine; pro- and mesofemora bearing two pairs of dark preapical tubercles, the apical pair bigger than basal.

Abdomen: Connexivum dark brown, bearing a pale yellow spot between anterior and posterior angles. Spiracles concolorous with ventral surface of abdomen.

Male Genitalia. ( Figs. 19–24 ) Ventral rim of pygophore deep-concave, middle third flat. Dorsal rim with median third and lateral margins straight, diverging. Superior processes of dorsal rim of pygophore in a large subquadrangular tubercles, located near the base of the paramere. A pair of acute denticles, placed at inner margin of posterolateral angles of pygophore. ( Fig. 25 ) Parameres with broad head, flat dorsoventrally, curved at a 60 ° angle. Phallus. ( Figs. 26–28 ) Processes of the phallotheca curved dorsally, slightly divergent and narrowing towards apex. Conjunctiva with tapered lateral lobes, median lobe sclerotized; ductus seminis distalis not coiled, not reaching the processus vesicae; length of conjunctiva and vesica together corresponds to one third the length of phalloteca.

Measurements: (n=10) Body length 7.8 (7.30–8.50) abdominal width 2,96 (2.77–3.09) head length 1.72 (1.64– 1.84) length before eyes 0.94 (0.84–1.08); head width 1.8 (1.68–1.84); interocular distance 0.98 (0.96–1.00); length of antennal segments: I 0.53 (0.50–0.62); II 0.77 (0.67–0.84); III 0.91 (0.74–0.99); IV 1.39 (1.21–1.43); V 1.55 (1.46–1.61); pronotum length 1.75 (1.55–1.86); pronotum width 5.29 (4.78–5.61); scutellum length 2.89 (2.58–2.96); scutellum width 3.02 (2.58–2.96).

Female Genitalia: ( Figs. 29–31 ) Gonocoxites 8 with sutural margin slightly sinuous, sutural angle acute, projected over gonocoxites 9, posterior margin concave. Gonocoxites 9 with obtuse posterolateral angles, surface biconcave. Laterotergites 8 acute, forming a black spine at apex. Laterotergites 9 obtuse at apex, exceeding the band that unites laterotergites 8 dorsally. Gonapophyses 9 with secondary thickening. Chitinelipsen elliptical. Thickening of vaginal intima with anterior and posterior regions subtriangular. Ductus receptaculi before vesicular area, shorter than this area. Ductus receptaculi after vesicular area shorter than pars intermedialis, dilated near the anterior annular flanges. Annular flanges convergent. Pars intermedialis subequal in length to capsula seminalis. Capsula seminalis elongated, digitiform.

Measurements: (n=10) Body length 8.95 (8.1–9.3); abdominal width 3.34 (2.90–4.46); head length 1.84 (1.68– 2.12); length before eyes 1.00 (0.88–1.00); head width 1.92 (1.80–2.00); interocular distance 1.1 (1.00±1.12); antennal segments length: I 0.54 (0.50–0.62); II 0.81 (0.65–0.90); III 0.98 (0.90–1.36); IV 1.41 (0.93–1.58); V 1.52 (1.46–1.67); pronotum length 1.97 (1.83–2.01); pronotum width 5.80 (5.04–5.92); scutellum length 3.18 (3.02– 3.21); scutellum width 3.34 (3.15–3.46).

Comments. Ladeaschistus borgesi (habitus Fig. 3 ), L. boliviensis and L. armipes present the same pattern of male genitalia, with the ventral rim broadly with excavation deep-concave, middle third flat. The “facies” of L. borgesi resembles that of L. bilobus and L. trilobus, but the non-emarginated ventral rim of pygophore will distinguish L. borgesi .

Figures

FIGURES 19 – 28. Ladeaschistus borgesi sp. nov. 19 – 24: Male, pygophore, respectively ventral, dorsal and posterior views. 25: Paramere, left. 26 – 28: Phallus, respectively ventral, dorsal and lateral views. (bpl, basal plate; cj, conjunctiva; dc, dorsal connective; dr, dorsal rim; dsd, ductus seminis distalis; dt, denticle; me, membranblase; pa, paramere; pc, processus capitati; ph, phallotheca; prph, processus phallothecae; prv, processus vesicae; spdr, superior process of dorsal rim; vc, ventral.

FIGURES 29 – 31. Ladeaschistus borgesi sp. nov. 29 – 30: Female, genital plates, posteroventral view. 31: Laterotergites, gonapophyses and gonocoxites of ninth segment, and ectodermal genital ducts, ventral view. (aaf, anterior annular flange; ch, chitinellipsen; cs, capsula seminalis; dr, ductus receptaculi; gc 8, gonocoxites 8; g 9, gonapophyses 9; gc 9, gonocoxites 9; la 8, laterotergites 8; la 9, laterotergites 9; paf, posterior annular flange; pi, pars intermedialis; tvi, thickening of vaginal intima; va, vesicular area; X, tenth segment). (Scales = 1 mm). onnective; vr, ventral rim; X, tenth segment). (Scales = 1 mm).

FIGURES 1 – 3. Dorsal view: 1: Euschistus (Euschistus) baranowskii sp. nov.; 2: Euschistus (Mitripus) saramagoi sp. nov.; 3 – Ladeaschistus borgesi sp nov. (Scales = 1 mm).