Placocoris Mayr, 1864

Placocoris Mayr, 1864

( Figs. 1–14 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 View FIGURE 9 View FIGURE 10 View FIGURE 11 View FIGURE 12 View FIGURE 13 View FIGURE 14 )

Placocoris Mayr, 1864: 903–914 ; Walker 1868: 402; Redtenbacher 1868: 70; Stål 1872: 45; De Marschall 1873: 377; Lethierry & Severin 1869: 179; Kirkaldy 1909: 140; Costa Lima 1940: 54–57; Kormilev 1949: 4; Rolston 1976: 2–8; Rolston et al. 1980: 121; Link & Grazia 1987: 121; Thomas 1990: 424, 2021: 595–604 View Cited Treatment ; Froeschner 1995: 543; Grazia & Schwertner 2008: 234; Coscarón et al. 2017: 242.

Mentisa Walker, 1868: 537 ; Lethierry & Severin 1869: 81; Distant 1899: 225, 1901: 20; Froeschner 1960: 343 (syn. by Rolston 1976: 2–8).

Chrysodarecus Breddin, 1903 ; Bergroth 1908: 151; Kirkaldy 1909: 328 (syn. by Thomas 2021: 595–604).

Type species. Placocoris viridis Mayr, 1864 .

Diagnosis. Body oval elongated, strongly flat dorsoventrally ( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 , 7–9 View FIGURE 7 View FIGURE 8 View FIGURE 9 ). Labium attaining or little surpassing anterior margin of mesosternum. Prosternum carinated, mesosternum flat ( Figs. 1 B View FIGURE 1 , 2 B View FIGURE 2 , 8 B View FIGURE 8 , 9 B View FIGURE 9 ). Dorsal surface of tibiae grooved; femora with a double row of tubercles, hind femora dilated with ventral spines at distal portion ( Figs. 3 E, F View FIGURE 3 , 10 E, F View FIGURE 10 ). Urosternite III with median tubercle ( Figs. 1 B View FIGURE 1 , 2 B View FIGURE 2 , 8 B View FIGURE 8 , 9 B View FIGURE 9 ); trichobothria lateral to the imaginary band connecting the spiracles.

Redescription. Body oval elongated, dorsoventrally flat. Head wider than long, eyes globose; lateral margin of mandibular plates convex, converging towards the apex, inner margins juxtaposed, apices rounded ( Figs. 1 A View FIGURE 1 , 2 A View FIGURE 2 , 3 A, B View FIGURE 3 , 7–9 A View FIGURE 7 View FIGURE 8 View FIGURE 9 , 10 A, B View FIGURE 10 ). Labium attaining or little surpassing anterior margin of mesosternum ( Figs. 1 B View FIGURE 1 , 2 B View FIGURE 2 , 8 B View FIGURE 8 , 9 B View FIGURE 9 ).

Thorax. Pronotum wider than long, anterior margin shallowly concave, anterolateral angles with a subtle denticle ( Figs. 3 A, B View FIGURE 3 , 10 A, B View FIGURE 10 ). Scutellum longer than wide. Prosternum carinated, mesosternum flat ( Figs. 1 B View FIGURE 1 , 2 B View FIGURE 2 , 7–9 B View FIGURE 7 View FIGURE 8 View FIGURE 9 ). Mesopleural evaporatoria occupying a uniformly wide area, as wide as the mesocoxal suture, and attaining the anterior and posterior angles of lateral pleural margin; metapleural evaporatoria occupying most of the metapleural width, with convex posterior margin; peritreme disc-type, with the anterior margin parallel to the anterior pleural margin, attaining the last third of pleural width; ostiole laterally oriented ( Figs. 3 C, D View FIGURE 3 , 10 C, D View FIGURE 10 ). Dorsal tibial surface grooved; femora with a double row of ventral tubercles, hind femora dilated with ventral spines at the distal half, the last two distinctly larger than the others. In males, the hind femora are larger than females, surpassing the posterior limit of the body ( Figs. 3 E, F View FIGURE 3 , 10 E, F View FIGURE 10 ).

Abdomen. Ventral median portion unpunctured; urosternite III with median tubercle; trichobothria lateral to the imaginary band connecting the spiracles ( Figs. 1 B View FIGURE 1 , 2 B View FIGURE 2 , 8 B View FIGURE 8 , 9 B View FIGURE 9 ).

Male. Genitalia. Pygophore dorsoventrally flat; posterolateral angles dorsally excavated and posteriorly projected ( Figs. 4 View FIGURE 4 , 11 View FIGURE 11 , pla). Dorsal rim concave over segment X ( Figs. 4 View FIGURE 4 , 11 View FIGURE 11 , dr); ventral rim concave on middle third ( Figs. 4 View FIGURE 4 , 11 View FIGURE 11 , vr). Segment X not exceeding the ventral rim, ogival, and with setae along the posterior margin ( Figs. 4 View FIGURE 4 , 11 View FIGURE 11 , X); head of parameres with a lateral rounded process and two branches. Phallus globose; theca with one hood-shaped apical process ( Figs. 5 View FIGURE 5 , 12 View FIGURE 12 , apt), curved dorsally, the latter with a sclerotized denticle on the ventral surface of process; apical margin of theca projected as flaps lateral to endosoma, the latter accompanying the ductus seminis distalis ( Figs. 5 View FIGURE 5 , 12 View FIGURE 12 , end).

Female. Genitalia ( Figs. 6 View FIGURE 6 , 13 View FIGURE 13 ). Valvifers VIII longer than wide, sutural margins juxtaposed, covering most of valvifers IX; laterotergites VIII wider than long; laterotergites IX with rounded apices, lateral and mesial margins convex, touching on midline and covering segment X ( Figs. 6 A View FIGURE 6 , 13 A View FIGURE 13 ). Thickening of vaginal intima subrectangular in ventral view ( Fig. 6 B View FIGURE 6 , 13 B View FIGURE 13 , tvi); secondary thickening of valvulae IX elliptical in ventral view, guttiform in anterior view ( Fig. 6 B View FIGURE 6 , 13 B View FIGURE 13 , tvIX); proximal portion of ductus receptaculi longer than vesicular area ( Fig. 6 B View FIGURE 6 , 13 B View FIGURE 13 , drp); capsula seminalis almost spherical, longer than pars intermedialis, and with digitiform projections ( Figs. 6 C View FIGURE 6 , 13 C View FIGURE 13 , cs).

Distribution. Colombia, Brazil, Peru, Paraguay, Argentina.