Chinavia geniculata (Dallas)

Genevcius, Bruno C. & Schwertner, Cristiano F., 2014, Review and phylogeny of the geniculata group, genus Chinavia (Heteroptera: Pentatomidae), with notes on biogeography and morphological evolution, Zootaxa 3847 (1), pp. 33-56 : 47-48

Chinavia geniculata (Dallas)

( Figs. 4 c, 5c, 6b; table 3)

Rhaphigaster (Nezara) geniculatus Dallas 1851 , 1:279.

Rhaphigaster obscuricornis Stål 1860 , 22; Walker 1867, 360.

Rhaphigaster geniculatus: Stål 1872 , 497; Walker 1867, 356.

Nezara geniculata: Mulsant & Rey 1866 , 289; Stål 1872, 40; Lethierry & Severin 1893, 165.

Nezara (Nezara) geniculata: Kirkaldy 1909 , 116.

Acrosternum geniculatum: Rolston 1976 , 3.

Acrosternum (Chinavia) geniculatum: Rolston 1983 , 106, 127–128; Frey-da-Silva & Grazia 2001, 110.

Chinavia geniculata: Schwertner & Grazia 2006 , 243; Schwertner & Grazia 2007, 422, 428; Campos et al. 2012, 164, 166. Genevcius et al. 2012, 4.

Diagnosis. Body mostly green, with narrow cream bands on the external margins of the juga. Antennae and apices of femora black. Black spots absent on the cicatrices of pronotum, scutellum and connexivum. Abdominal spine not reaching metacoxae.

Head. Margins of juga with a strong concavity in front of eyes and concolorous with the body; apex of head elliptical in shape. Antennae with the two first segments black. Proportion of antennal segments: I<II<III≈IV>V. Rostrum surpassing the metacoxae. Apex of tylus with a black spot.

Thorax. Humeral angles obtuse, not produced. Anterolateral margins of pronotum with a slight submarginal dorsal depression. Scutellum, pronotum and corium without any black spots. Propleura without a black longitudinal stripe at the external margin. Membrane of hemelytra darkened.

Abdomen. Abdominal spine not reaching metacoxae; Spiracles not colored and without a callus. Connexivum green and without black spots at the anterior and posterior margins.

Male genitalia ( Fig. 5 c). Pygophore subtrapezoidal, with the posterolateral angles projected well beyond the ventral rim. Lateral margins of pygophore rounded. Median projection of dorsal rim slightly concave. Flaps of pygophore ventral rim folded over the genital cup with the mesial margins irregular; apex of flaps without a curved hook-like projection. Segment X dorsally convex. Parameres projected laterally, with the apices black.

Female genitalia. Gonocoxites 8 and laterotergites 9 flattened. Posterior margins of the gonocoxites 8 straight. Gonocoxite 9 slightly concave. Pars intermedialis conical, enlarged at the apex, as long as the capsula seminalis; width of capsula seminalis three times the width of pars intermedialis. Anterior annular flange shorter than the posterior and slightly curved towards the vesicular area. Posterior annular flange curved towards the pars intermedialis. Processes of capsula seminalis subequal in length, five times the length of pars intermedialis.

Adult size. 14–17mm.

Distribution. Brazil (SC, RJ).

Material examined. Corcovado (RJ—Brazil), 1963, Alvarenga & Seabra col., DZRS (2♀); Rio de Janeiro (RJ—Brazil), 1957, Zajciv col., MNRJ (5♀); Nova Friburgo (RJ—Brazil), Muller col., NMNH (1♀); Rio de Janeiro (RJ—Brazil), 1963, M. Alvarenga col., NMNH (3♀); Rio de Janeiro (RJ—Brazil), Freitas & Lopes col., FIOC (1♀); Petropolis (RJ—Brazil), 1985, Scott & Miller col., NMNH (1♂); Jussaral (RJ—Brazil), 1934, MNRJ (1♂); Rio de Janeiro (RJ—Brazil), 1902, Wagner ER col., MNHN (1♂); Corcovado (RJ—Brazil), 1♂.

Comments. This is the species for which the group is named as it is the oldest name available. It is one of the largest species of Chinavia and quite similar to C. cearensis , but without the red external margins of the juga.

Figures

FIGURE 4. Dorsal view of the geniculata group species. A = C. cearensis, B = C. erythrocnemis, C = C. geniculata, D = C. gravis, E = C. immaculata, F = C. nigritarsis, G = C. nigropicta, H = C. panamensis, I = C. pontagrossensis, J = C. rogenhoferi, K = C. rideri, L = C. sebastiaoi, M = C. tuiucauna, N = C. vanduzeei.

FIGURE 5. Dorsal view of the pygophores of the geniculata group species. A = C. cearensis, B = C. erythrocnemis, C = C. geniculata, D = C. gravis, E = C. immaculata, F = C. nigritarsis, G = C. pontagrossensis, H = C. rideri, I = C. sebastiaoi, J = C. vanduzeei; pa = posterolateral angle.