Placocoris viridis Mayr, 1864

Sampaio, Vinícius Gomes & Campos, Luiz Alexandre, 2025, Review of Placocoris Mayr, 1864 (Hemiptera: Pentatomidae: Discocephalinae: Ochlerini), Zootaxa 5701 (5), pp. 531-546 : 533-538

Additions to the description of Placocoris viridis Mayr, 1864

( Figs. 1–6 , 14 )

Placocoris viridis Mayr, 1864: 913 ; Walker 1868: 402; Stål 1872: 45; Lethierry & Severin 1869: 179; Kirkaldy 1909: 140; Costa Lima 1940: 54–57; Rolston 1976: 2–8; Rolston et al. 1980: 124; Grazia & Schwertner 2008: 234; Coscarón et al. 2017: 242; Melo et al. 2017: 500; Thomas 2021: 595–604.

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

Chrysodarecus moneta Breddin, 1903: 383 ; Bergroth 1908: 151; Kirkaldy 1909: 328; Thomas 2021: 595–604 (syn.).

Types examined: Peru / Marcapata [ -13.5911, -70.9975] // Chrysodarecus / moneta Bredd / coll. / Breddin // Typus // Lectotypus // des / H. Gaedike / 1968 // DEI Hemimetabola / #100210 [deposited in: DEI] (Photo examined, available in Thomas, 2021) .

Material examined: BRAZIL, Rio de Janeiro, Itatiaia [ -22.4911, -44.7197], 1 female, 16-II-1924, J. F. Zikan (CEIOC); 1 female, XII-1959, Dirings (MRCN); Manguinhos [ -22.8790, -43.2440], 1 female, 30-VII-1913, A. Lutz (CEIOC); São Paulo, Boa Esperança do Sul [ -21.9941, -48.3870], 8 males, 2 females, 26-IV-1968, K. Lenko (MZSP HEM); Santa Catarina, Florianópolis, São João do Rio Vermelho [ -27.4866, -48.4168], 1 male, XII-1945, A. Maller ( UFRG); PERU, Junín, Satipo [ -11.2526, -74.6384], 1 male, I-1944, P. Paorzyck (CEIOC).

Records retrieved from iNaturalist: BRAZIL, Rondônia, Porto Velho [ -8.7554, -63.8917], (photo by Rondoniano); Mato Grosso, Novo Mundo [ -9.5976, -55.9318], (photo by Sidnei Dantas); São Paulo, Itariri, [ - 24.3331, -47.1728]; Paraná, Guaraqueçaba, [ -25.2784, -48.2206], (photo by Josh Baryia); Pato branco [ -26.2327, -52.6611], (photo by João Ortolan).

Diagnosis. Body ventrally dark brown, dorsally with iridescent hues of green ( Figs. 1 , 2 ). Pronotal lateral margins convex ( Fig. 2 A, B ). Scutellum width at frenal constriction greater than half the basal width. Corial apical angle almost attaining the midline of connexival segment V ( Figs. 1 A , 2 A ). Metasternum elevated, posterior margin acute ( Figs. 1 B , 2 B ).

Male. Hind femora ca. 1.2 times longer than the combined length of urosternites III –VII on midline, and twice wider than the length of urosternite IV on midline. Genitalia ( Figs. 4 , 5 ). Pygophore. Lateral margins slightly convex ( Fig. 4 A, C ); dorsal wall length on midline longer than the length of segment X; posterolateral angles acute; segment X with dense setae along the posterior margin ( Fig. 4 A ). Ventral rim forming digitiform projections lateral to parameres ( Fig. 4 A, B ); U-shaped on middle under segment X ( Fig. 4 C , vr). Parameres laterally sinuous; lateral processes round, setae absent; ventral margins of the branches of the parameres’ head flat, external branch slightly longer than the internal ( Fig. 5 D–F ). Phallus. Thecal hood-shaped process ( Fig. 5 A–C , apt) smaller than theca; ventral sclerotized denticle placed in the middle of apt ( Fig. 5 C, d ); thecal flaps lateral to endosoma large, as wide as the apt in lateral view ( Fig. 5 C ); endosoma several times smaller than theca ( Fig. 5 A–C , end).

Measurements (n=10) Total length 9.80 ± 0.60 (10.90–8.80); width of abdomen 5.35 ± 0.36 (6.10–4.90); head length 1.30 ± 0.05 (1.40–1.20); width 1.60 ± 0.08 (1.80–1.50); pronotum length 2.00 ± 0.11 (2.10–1.80); width 4.80 ± 0.27 (5.30–4.30); scutellum length 3.70 ± 0.21 (4.00–3.30); width 3.10 ± 0.17 (3.40–2.80); length of antennomeres: I (n=9) 0.40 ± 0.04 (0.50–0.40), II (n=9) 0.40 ± 0.07 (0.40–0.20), III (n=8) 0.80 ± 0.06 (0.90–0.70), IV (n=8) 1.00 ± 0.06 (1.20–1.00), V (n= 8) 1.40 ± 0.09 (1.50–1.30); length of labiomeres: I 0.35 ± 0.05 (0.40–0.30), II 0.60 ± 0.04 (0.70–0.60), III 0.50 ± 0.03 (0.50–0.40), IV (n=9) 0.30 ± 0.03 (0.40–0.30).

Female. Hind femora ca. 0.8 times the combined length of urosternites III –VII on midline, and about as wide as the length of urosternite IV on midline. Genitalia ( Fig. 6 ). Valvifers VIII with posterior margins slightly sinuous, angulose over valvifers IX (Fig. 67 A, vfVIII, vfIX); laterotergites VIII with the posterior margin projected in a rounded minute spine ( Fig. 6 A , laVIII); exposed part of valvifers IX trapezoidal; laterotergites IX surpassing mediotergite VIII ( Fig. 6 A , laIX). Thickening of vaginal intima subrectilinear at the distal margin; median duct of vesicular area widened proximally; distal portion of ductus receptaculi smaller than pars intermedialis and capsula seminalis taken together ( Fig. 6 B, C , drd); capsula with three digitiform projections ( Fig. 6 B, C , pi, cs).

Measurements (n=5) Total length (n=4) 9.90 ± 0.74 (10.80–9.30); abdominal width (n=3) 5.10 ± 0.32 (5.60– 5.00); head length 1.00 ± 0.05 (1.50–1.20); width 1.60 ± 0.13 (1.90–1.60); pronotum length 2.00 ± 0.15 (2.10–1.80); width 5.00 ± 0.39 (5.20–4.30); scutellum length 3.60 ± 0.30 (4.00–3.40); width 3.30 ± 0.25 (3.30–2.80); length of antennomeres: I 0.40 ± 0.04 (0.60–0.30), II 0.40 ± 0.05 (0.60–0.30), III 0.80 ± 0.10 (0.90–0.70), IV 1.10 ± 0.10 (1.40–1.10), V (n= 3) 1.50 ± 0.00 (1.50); length of labiomeres: I 0.30 ± 0.04 (0.40–0.30), II 0.60 ± 0.04 (0.70–0.60), III 0.50 ± 0.04 (0.60–0.50), IV 0.30 ± 0.04 (0.40–0.30).

Distribution. Brazil, Peru, Paraguay, and Argentina ( Fig. 14 ).

Figures

FIGURE 1. Placocoris viridis Mayr, 1864, male, A, dorsal; B, ventral; C, lateral. Scale bar = 5 mm.

FIGURE 2. Placocoris viridis Mayr, 1864, female, A, dorsal; B, ventral; C, lateral. Scale bar = 5 mm.

FIGURE 3. Placocoris viridis Mayr, 1864, male (left) and female (right), A, B, head and pronotum; C, D, external scent efferent system; E, F, detail of the hind femur, lateral view. Scale bars: A, B = 2 mm; C–F = 1 mm.

FIGURE 4. Placocoris viridis Mayr, 1864, male, pygophore, A, dorsal; B, dorsolateral; C, ventral; D, lateral; E, posterior. Abbreviations: dr = dorsal rim; pla = posterolateral angle; vr = ventral rim; X = segment X. Scale bar = 1 mm.

FIGURE 5. Placocoris viridis Mayr, 1864, male, A–C, phallus in dorsal, ventral and lateral views, respectively; D–F, right paramere in dorsal, lateral and medial views, respectively. Abbreviations: apt = apical process of theca; d = denticle of apical process; end = endosoma. Scale bars = 0.5 mm.

FIGURE 6. Placocoris viridis Mayr, 1864, female,A, genital plates; B, internal genitalia; C, distal portion of ductus receptaculi, pars intermedialis, and capsula seminalis. Abbreviations: cs = capsula seminalis; drd = distal portion of ductus receptaculi; drp = proximal portion of ductus receptaculi; laVIII = laterotergites VIII; laIX = laterotergites IX; pi = pars intermedialis; tvIX = secondary thickening of valvulae IX; tvi = thickening of vaginal intima; vfVIII = valvifers VIII; vfIX = valvifers IX; X = segment X. Scale bars: A, B = 1 mm; C = 0.5 mm.

FIGURE 14. Distribution map of Placocoris viridis Mayr, 1864 and Placocoris albovenosus Kormilev, 1949 (mapped on the biogeographic regionalization of the Neotropical Region by Morrone et al. 2022).