Nysius irroratus (Spinola)

Pall, José Luis, Kihn, Romina Gisela, Diez, Fernando & Coscarón, María Del Carmen, 2016, A review of genus Nysius Dallas in Argentina (Hemiptera: Heteroptera: Orsillidae), Zootaxa 4132 (2), pp. 221-234 : 227-231

Nysius irroratus (Spinola)

( Figs. 10–18 , 20 )

Heterogaster irroratus Spinola, 1852: 154 –155.

Nysius irroratus: Berg 1895: 198 . Pennington 1921: 18. Slater 1964: 284. Berg 1896: 132. Nysius irroratus var. melancholicus Breddin, 1897: 5 .

Redescription. Male. ( Figs. 10, 11 ) n = 10. Total length: 4.1–4.7 (mean: 4.4); head length: 0.4–0.6 (mean: 0.5); head width: 1; eye width:0.2–0.25 (mean: 0.22); interocular space: 0.5–0.6 (mean: 0.8); rostrum: I 0.25–0.62 (mean: 0.43), II 0.52–0.57 (mean: 0.54), III 0.52, IV --; antennal segments: I 0.25–0.32 (mean: 0.28), II 0.5–0.62 (mean: 0.56), III 0.3–0.42 (mean: 0.36), IV 0.5–0.62 (mean: 0.56); pronotum length: 0.65–0.75 (mean: 0.7); pronotum width: 1.25–1.32 (mean: 1.28); scutellum length: 0.55–0.65 (mean: 0.6); scutellum width: 0.67–0.82 (mean: 0.74); abdomen with hemelytra length: 2.25–3 (mean: 2.62); abdomen without hemelytra length: 1.95–2.75 (mean: 2.35); abdominal width: 0.95–1.25 (mean: 1.1).

Dorsal coloration: Head dark brown to black, hairy, with abundant dark score, with a light colored midline extending from base of head to apex of clypeus; compound eyes dark-reddish; ocelli reddish with dark base; antennal segment I shorter than other ones, dark colored with clear scores; antennal segment I shorter than other, dark with clear internal apical region, segment III shorter segments II and IV, II and IV segments of similar size, all segments of dark color. Pronotum dark brown to black, hairy, with dark spots; the apical ends have dark color, like the trailing edge which has dark spots in middle region and external apices; it has two dark lines in distal region, just behind head near edge. Scutellum dark, with black scores and hairiness, has two small light spots at both ends, in the middle region. Corium and clavus light with dark brown spots. Hemelytra clear, dark and light in the veins and the apical end spots. Connexival segments dark brown with hairiness. Ventral coloration: dark color; dark head hairy. First segment of prosternum light brown, hairy; abdomen dark; legs, coxa and trochanter light-colored, femora light with dark spots uniformly distributed, in some cases entirely covering the femur. Structure: ocelli located on two small lobes; antennae of moderate length, first segment exceeding head by 1/3 to 1/2 its length, slightly outcurved, distinctly thicker than second and third which are slender, fourth club-like about as thick as first; pronotum rectangular, with slightly elevated apical ends, straight trailing edge; scutellum triangular. Smooth legs, femurs thicker than other limbs. Hemelytra reaching apical end of the abdomen; Aedeagus ( Fig. 14 ) with phallotheca moderately pigmented wide, tubular, membranous, conjunctiva no constrictions, vesical sclerotized, vesical basal lobes indistinctly inside bladder ejaculatory duct with 3–5 turns. Paramere ( Fig. 15 ) slightly curved, short and wide, with dorsal flange and ventral lobe little prominent, latter with villous at base.

Female. ( Figs. 12, 13 ) n = 10. Total length: 4–5 (mean: 4.5); head length: 0.45–0.6 (mean: 0.75); head width: 0.9–1.05 (mean: 0.97); eye width: 0.15–0.2 (mean: 0.17); interocular space: 0.45–0.6 (mean: 0.52); rostrum: I 0.25–0.47 (mean: 0.36), II 0.45–0.58 (mean: 0.51), III 0.37–0.4 (mean: 0.38), IV 0.42; antennal segments: I 0.22, II 0.45–0.65 (mean: 0.55), III 0.32–0.4 (mean: 0.36), IV 0.47–0.62 (mean: 0.54); pronotum length: 0.67–0.87 (mean: 0.77); pronotum width: 1.27–1.47 (mean: 1.37); scutellum length: 0.55–0.65 (mean: 0.6); scutellum width: 0.75– 0.92 (mean: 0.83); abdomen without hemelytra length: 1.62–3.25 (mean: 2.43); abdomen without hemelytra length: 2.25–3 (mean: 2.62); abdominal width: 1–1.15 (mean: 1.07).

Dorsal coloration: Same color as male. Ventral coloration: similar to male, except in abdomen, this shows a clear color with dark lateral edges from third abdominal segment. Legs light brown, clear femora with dark spots, fewer than in males. Structure: same as males. Ovipositor with first branch spanning almost entire length of first gonapophysis ( Fig. 16 ); second gonapophysis as in Figure 17 . spermatheca ( Fig. 18 ) saccoid, with spherical bulb, duct with turns, basal part moderately broad.

Type specimen examined: No type specimen was available for examination.

Other specimens examined: Argentina : Chubut: Esquel: (42º57,539'S 71º23,409'W) (6♂ 12♀), 18/01/ 2014, Sweep-net, (2♀), M.C. Coscarón, F. Diez & M. Ruiz-Espindola Col., José Luis Pall det. ( MLP); Next to Pampa de Agnia: (43º34,961'S 70º18,930'W) (2♂), 21/02/2013, Sweep-net, M.C. Coscarón, E. Quirán, F. Diez & J.L. Pall Col., José Luis Pall det. ( MLP), 50 Km. de Pampa de Agnia: (43º34,961'S 70º18,930'W) (12♂), 09/01/ 2014, g-vac, M.C. Coscarón, F. Diez & M. Ruiz-Espindola Col., José Luis Pall det. ( MLP). La Pampa: riverside De La Barda River Prox. Algarrobo del Águila (1Km) (36°24'S 67°08'W) (19♂ 11♀), Sweep-net, F. Diez Col., José Luis Pall det. ( MLP), Puelches (38º08'S 65º54'W) (1♀) 28-11-2010, Coscarón & Pall, J.L. col., Pall J.L. det. ( MLP). Neuquén: San Martín de Los Andes: (40º09,616'S 71º20,89'W) (10♂ 10♀), 09/01/2014, g-vac, M.C. Coscarón, F. Diez & M. Ruiz-Espindola Col., José Luis Pall det. ( MLP), Next to Villa la Angostura: (40°36,377'S 71°42,484'W) (91♂ 99♀), 09/01/2014, Sweep-net, M.C. Coscarón, F. Diez & M. Ruiz-Espindola Col., José Luis Pall det. ( MLP). Río Negro: Next to El Bolsón: (41º36,853'S 71º28,032'W) (12♂ 16♀), 09/01/2014, Sweep-net, M.C. Coscarón, F. Diez & M. Ruiz-Espindola Col., José Luis Pall det. ( MLP), next to Bariloche: (41°02,140´S 71°16,219´W) (7♀), 09/01/2014, g-vac M.C. Coscarón, F. Diez & M. Ruiz-Espindola Col., José Luis Pall det. ( MLP).

Material examined by photographs only: Cubillo, Cord. Cnrico, Chile, (Oct. 1960). L.E. Peña. Donation from J.A. Slater Collection. Nysius irroratus ( Spin.) J.A. Slater det. ( AMNH). Nysius irroratus ( Spin.) , slättmark, NHRS-Guli 0 0 0 0 29428 ( NRM).

Distribution in Argentina : Chubut; La Pampa; Neuquén; Río Negro; Tierra del Fuego. New records in Argentina : Chubut: Esquel, Next to Pampa de Agnia, 50 Km. de Pampa de Agnia; La Pampa: Algarrobo del Aguila, Puelches; Neuquén: San Martín de Los Andes, Next to Villa la Angostura; Río Negro: Next to El Bolsón, next to Bariloche.

Figures

FIGURE 20. Distribution of species Nysius irroratus (Spinola) in Argentina: white spot: only locality registered from the country; yellow spot: new records in the country (2015).

FIGURES 10 – 13. Nysius irroratus (Spinola): 10 – 11: female: 10 dorsal view, 11 ventral view; 12 – 13 male: 12 dorsal view, 13 ventral view.

FIGURES 14 – 18. 14 – 15: Nysius irroratus (Spinola): male genitalia: 14 aedeagus, lateral view, 15 left paramere; 16 – 18: female genitalia: 16 – 17: ovipositor: 16 first gonapophysis, 17 second gonapophysis, 18 spermatheca.