Chinavia erythrocnemis (Berg)

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 : 43-44

Chinavia erythrocnemis (Berg)

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

Nezara erythrocnemis Berg 1878 , 27–28; Lethierry & Severin 1893, 165.

Nezara (Acrosternum) erythrocnemis: Kirkaldy 1909 , 118.

Acrosternum erythrocnemis: Pennington 1920 , 9; Quintanilla et al. 1981, 151; Coscarón & Grazia 2000, 23.

Acrosternum (Chinavia) erythrocnemis: Rolston 1983 , 108, 161; Frey-da-Silva & Grazia 2001, 112.

Chinavia erythrocnemis: Matesco et al. 2006 , 483–488; Schwertner & Grazia 2007, 419, 424, 426–427; Grazia & Schwertner 2008, 233.

Diagnosis. External margins of pronotum, hemelytra and connexivum with a wide orange band. Black spots present on the anterior and posterior margins of the connexivum and on the cicatrices of the pronotum. External margins of juga with a wide red band; trochanter and tibia colored in red.

Head. Margins of juga orange, with a strong concavity in front of eyes; apex of head semi-circular in shape. Antennae with the first segment red, and the other segments black. Proportion of antennal segments: I<II<III≈IV>V. Rostrum surpassing the metacoxae. Tylus well-marked and outlined in black.

Thorax. Humeral angles obtuse, not produced. Anterolateral margins of pronotum with a slight submarginal dorsal depression. Internal and external margins of the cicatrices of pronotum black. Basal angles of scutellum immaculate. Propleura with a black longitudinal stripe at the external margin. Membrane of hemelytra darkened.

Abdomen. Abdominal spine reaching metacoxae; spiracles not colored and without a callus. Connexivum yellow, with the anterior and posterior margins black.

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

Female genitalia. Gonocoxites 8 and laterotergites 9 flattened. Posterior margins of gonocoxites 8 sinuous. Gonocoxite 9 strongly 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, four times the length of pars intermedialis.

Adult size. 11–14mm.

Distribution. Argentina, Brazil (Rio Grande do Sul), Paraguay and Uruguay.

Material examined. Uruguaiana (RS—Brazil), 1995, S. Pinnent col., DZRS (3♀); Planalto (RS—Brazil), 1993, Fernandes JAM col., DZRS (1♀ 1♂); Est. Ecol. Taim (RS—Brazil), 1982, J. Grazia col., DZRS (1♀); Itapiranga (RS—Brazil), 1952, MGAP (1♀); Paraguay river ( Paraguay), 1934, Schuzle col., NMNH (3♀ 2♂); Chapada ( Brazil), 1956, Drake CJ col., NMNH (1♀ 1♂); Est. Ecol. Taim (RS—Brazil), 1981, J. Grazia col., DZRS (1♂); Ybycui National Park ( Paraguay), 1980, Spangler col., NMNH (1♀); Pq. Est. Turvo (RS—Brazil), 1982, Bometto SLB col., DZRS (1♀); San Tomé Corrientes ( Argentina), 1928, MACN (4♀ 2♂); Cascavel (PR—Brazil), 1974, Panizzi col., DZRS (1♂).

Comments. This is the only species of the geniculata group with nymphal stages described ( Matesco et al. 2006). It is very similar to C. pontagrossensis and C. rideri , being distinguished by the red femora and the unique distribution pattern in the Pampa and Chaco.

ID HL HW SW SL PW PL

C. cearensis ♀ 1.33 2.07 2.53 5.03 5.63 8.2 2.9

♂ 1.1 1.9 2.37 4.8 5.16 7.53 2.83

C. erythrocnemis ♀ 1.3±0.03 2.13±0.05 2.42±0.08 5.15±0.29 5.9±0.05 8.5±0.36 3.13±0.09 ♂ 1.12±0.03 2.14±0.07 2.49±0.07 4.65±0.32 5.28±0.66 7.67±0.6 2.66±0.16

C. geniculata ♀ 1.43±0.05 2.44±0.04 2.85±0.04 5.85±0.23 6.28±0.06 9.37±0.14 3.34±0.04 ♂ 1.22±0.06 2.27±0.05 2.71±0.06 5.2±0.23 5.58±0.08 8.35±0.18 2.85±0.37

C. gravis ♀ 1.29±0.03 2.29±0.03 2.77±0.15 4.99±0.18 5.52±0.21 8.04±0.26 2.82±0.1 ♂ 1.07±0.01 2.3±0.07 2.76±0.02 4.68±0.22 5.33±0.27 7.65±0.43 2.38±0.19

C. immaculata ♀ 1.2±0.05 2.11±0.04 2.42±0.06 4.74±0.08 5.09±0.08 7.91±0.13 2.57±0.08 ♂ 0.98±0.01 1.95±0.05 2.3±0.02 4.2±0.03 4.6±0.13 7±0.11 2.18±0.03

C. nigritarsis ♀ 1.27±0.03 2.16±0.11 2.63±0.2 4.98±0.14 5.53±0.21 8.04±0.21 2.86±0.19 ♂ 1.22 2.51 2.86 5.33 5.83 8.44 2.92

C. nigropicta ♀ 1.10 2.45 3.1 5.19 5.59 7.58 2.66

♂ - - - - - - -

C. panamensis ♀ 1.00 2.35 2.9 5.06 6.38 7.71 2.53

♂ - - - - - - -

C. pontagrossensis ♀ 1.23±0 2.02±0.02 2.28±0.08 4.88±0.15 5.38±0.35 7.91±0.32 2.73±0.07 ♂ 0.99 2.14 2.28 4.86 5.45 7.99 2.77

C. rideri ♀ 1.32±0.06 2.27±0.08 2.63±0.05 5.73±0.14 6.2±0.24 9.37±0.16 3.13±0.22 ♂ 1.19±0.02 2.28±0.08 2.54±0.07 5.18±0.25 5.91±0.32 8.51±0.45 2.75±0.21

C. rogenhoferi ♀ 1.25±0.05 2.19±0.06 2.58±0.04 4.76±0.14 5.08±0.13 7.64±0.1 2.44±0.06

♂ - - - - - - -

C. sebastiaoi ♀ 1.43±0.05 2.24±0.09 2.57±0.05 5.81±0.19 6.49±0.17 9.19±0.11 3.25±0.26 ♂ 1.3±0.1 2.31±0.04 2.61±0.01 5.54±0.12 6.28±0.05 8.77±0.29 2.83±0.23

C. tuiucauna ♀ 1.27 2.2 2.7 5.46 5.93 8.8 3.23

♂ - - - - - - -

C. vanduzeei ♀ 1.29±0.02 2.22±0.03 2.64±0.06 4.66±0.12 5.23±0.03 7.36±0.14 2.55±0.06 ♂ 1.02±0.04 2.18±0.05 2.6±0.1 4.38±0.13 4.95±0.24 6.91±0.22 2.33±0.04

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.