Chinavia gravis (Walker)

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 : 48

Chinavia gravis (Walker)

( Figs. 4 d, 5d; table 3)

Strachia gravis: Walker 1867 , 322; Lethierry & Severin 1893, 201.

Nezara gravis: Distant 1900 , 393; Kirkaldy 1909, 121.

Nezara gentilis Breddin 1903 , 369; Bergroth 1908, 171; Gaedike 1971, 86. Acrosternum grave: Rolston 1976 , 4.

Acrosternum (Chinavia) grave: Rolston 1983 , 106, 126–127; Frey-da-Silva & Grazia 2001, 110. Chinavia gravis: Schwertner & Grazia 2006 , 238; Schwertner & Grazia 2007, 422, 428.

Diagnosis. Dark green body with a longitudinal median yellow band on the pronotum and scutellum. Wide cream bands on the external margins of the pronotum, scutellum and hemelytra. Femora and tibia black. Apex of tylus with a small black spot.

Head. Margins of juga with a strong concavity in front of eyes; head almost completely yellow, with the apex semi-circular in shape. Antennae with all segments black. Proportion of antennal segments: I<II<III≈IV>V. Rostrum surpassing the metacoxae. Apex of tylus with a small black spot.

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

Abdomen. Abdominal spine not reaching metacoxae; spiracles concolorous with the body and without a callus. Connexivum without black spots at the anterior and posterior margins.

Male genitalia ( Fig. 5 d). 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 a secondary folding at the median region; apex of flaps without a curved hook-like projection. Segment X dorsally convex. Parameres projected laterally, black.

Female genitalia. Gonocoxites 8 and laterotergites 9 flattened. Posterior margins of the gonocoxites 8 straight. Gonocoxite 9 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, twice the length of pars intermedialis.

Adult size. 13–14mm.

Distribution. Colombia, Brazil (RO, AM, MT), Peru.

Material examined. Rio Santiago ( Peru), H Bassler col., AMNH (1♀); Manaus (AM—Brazil), 1941, Parko col., FIOC (2♀); Pucallpa ( Peru), 1960, Dirings col., MZSP (1♀); Rio Maranon ( Peru), AMNH (1♀ 1♂); Serra Norte (PA—Brazil), 1985, Salobo col., DZRS (1♂), Caño Grande ( Colômbia), 1953, Biichel col., ICN-MHN (1♂); Yavita ( Venezuela), 1952, Biichel col., ICN-MHN (♂).

Comments. This species is easily recognized by the dark green body and the yellow stripe at the center of the scutellum, a unique pattern within Chinavia .

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.