Heteroscelis robustus Thomas, 1992

Sampaio, Vinicius Gomes, Roell, Talita & Campos, Luiz Alexandre, 2023, Revision of Heteroscelis Latreille, 1829 (Heteroptera: Pentatomidae: Asopinae) with the description of a new species from Colombia, Zootaxa 5278 (3), pp. 401-438 : 426-430

Heteroscelis robustus Thomas, 1992

( Figs. 1 , 25–29 )

Heteroscelis robustus Thomas, 1992: 49 ; Grazia & Schwertner 2011: 713; Silva et al. 2018: 404 .

Types examined. BRAZIL. Heteroscelis robustus Thomas, 1992 ; male holotype; labels: “ HOLOTYPE. Heteroscelis robustus Thom. ”, “Braz. Mato Grosso — Barra do Tapirape. 26–XII–62. B. Malkin ”. “ California Academy of Sciences ”. “Type n°: 16773” ( CAS). Photo examined ( Fig. 26 ) .

Other material examined. BRAZIL, Amazonas: (Manaus, Conj. Manca. -3.04361, -60.01282), 1 female, 10.V.1988 P.E.S. Silva ( INPA); Roraima: ( Boa Vista , 3.18861, -60.61212), 1 female, 31.V.1974 ( UFRG); Pará: (Peixe-Boi, -1.10168, -47.27259), 1 female, 12.IV.1977 P Waldir ( UFRG); ( Marituba , -1.37399, -48.3142), 1 female, 07.VI.1961 J & B. Bechyné ( UFRG); Mato Grosso: (Chapada dos Guimar „es, -15.02015, -55.53735), 1 female, 20.I.1961 J & B. Bechyné ( UFRG); São Paulo: 3 females, J. Mráz ( NMPC); Rio Grande do Sul: ( Salvador do Sul , -29.48006, -51.51407), 1 male, 16.X.1994 ( MCTP); COLOMBIA, (Meta, San Martín, Reserva Natural El Caduceo, Km 4.5, Via San Francisco , 3.671389, -73.659444), 1 male, 30.IX–4.X.2013 M Arango ( MPUJ _ENT).

Diagnosis. Body robust compared to the other species, dark-brown to black; unpunctured, yellowish longitudinal line extending from the anterior margin of the pronotum to the posterior margin of the scutellum; radial vein of coria usually yellowish; foretibial length on average ten times larger than the width of the dorsal tibial expansion ( Fig. 25 , F); capsula seminalis digitiform.

Redescription

HEAD: Mandibular plates equal to or slightly surpassing clypeus, rounded at apex, never touching each other; head length anterior to the eyes smaller than 2/3 of the total length of the head ( Fig. 25 , D); labium reaching the metasternum; proportion of labiomeres: I<II>III ≅ IV; proportion of antennomeres: I<II<III ≅ IV ≅ V.

THORAX: Coria longer than the scutellum, not reaching the posterior margin of the connexival segment VI; metapleural evaporatoria not surpassing posteriorly the anterior limit of coxae; peritreme disc-shaped, surpassing half the pleural width; apex of peritreme rounded, posterior margin arched, convex, anterior margin almost straight ( Fig. 25 , E).

ABDOMEN: Uniformly punctured; urosternite III tubercle not surpassing the posterior margin of metasternum; posterior angles of urosternites III to VII ending in minute spine, more developed in VII ( Fig. 25 , B).

Male:

MEASUREMENTS (n=2). Head length 1.24 ± 0.05 (1.20–1.28); width 1.48 ± 0.05 (1.44–1.52); pronotum length 1.88 ± 0.16 (1.76–2.00); width 4.12 ± 0.16 (4.00–4.24); scutellum length 2.60 ± 0.05 (2.56–2.64); width 2.60 ± 0.05 (2.24–2.40); length of antennomeres: I (n=1) 0.32, II 0.64 ± 0.11 (0.56–0.72), III 0.84 ± 0.05 (0.80–0.88), IV 0.96 ± 0.11 (0.88–1.40); V (n=1) 1.12; length of labiomeres: I 0.68 ± 0.05 (0.64–0.72), II 0.72 ± 0.00 (0.72–0.72), III 0.40 ± 0.00 (0.40–0.40), IV 0.48 ± 0.00 (0.48–0.48); width of foretibal expansion 0.20 ± 0.05 (0.16–0.24); width of abdomen 3.40 ± 0.28 (3.20–3.60); total length (n=1) 7.20.

GENITALIA: Pygophore ( Fig. 27 ): setae denser on medial portion of dorsal rim; dorsal rim sinuous, medially concave; ventral rim sinuous, shallowly concave medially; segment X setose on the entire surface; heads of parameres lateroventrally directed in posterior view. Phallus ( Fig. 28 ): conjunctival dorsal lobe with one pair of long projections, ventral lobes with two projections each.

Female:

MEASUREMENTS (n=8). Head length 1.12 ± 0.09 (1.00–1.28); width 1.40 ± 0.05 (1.44 –1.53); pronotum length 1.96 ± 0.21 (1.76–2.20); width 4.42 ± 0.33 (4.16–5.00); scutellum length 2.99 ± 0.26 (2.72–3.50); width 2.66 ±0.25 (2.40–3.10); length of antennomeres: I (n=6) 0.38 ± 0.03 (0.32–0.44), II (n=4) 0.71 ± 0.10 (0.60–0.80), III (n=4) 0.98 ± 0.09 (0.88–1.10), IV (n=1) 1.12; V (n=1) 1.04; length of labiomeres: I (n=7) 0.76 ± 0.07 (0.70–0.90), II (n=7) 0.90 ± 0.11 (0.80–1.10), III (n=7) 0.40 ± 0.05 (0.32–0.50), IV (n=7) 0.50 ± 0.04 (0.48–0.60); width of foretibal expansion (n=5) 0.25 ± 0.06 (0.16 –0.30); width of abdomen 4.06 ± 0.25 (3.68–4.50); total length (n=6) 7.67 ± 0.88 (6.56 –8.90).

GENITALIA ( Fig. 29 ): Valvifers VIII posterior margin bisinuous, truncate over the laterotergites VIII, and slightly projected over the basal angles of laterotergites IX, setae on sutural margins; laterotergites VIII slightly longer than wide, with spiracles close to the lateral margin; segment X with the posterior margin straight; valvulae IX with 1+1 secondary thickenings, these bean-shaped with the anterior margin elongated with acute apices; vesicular area half the length of the proximal part of the ductus receptaculi.

Distribution: Paraguay, Colombia (new record) and Brazil ( Fig. 1 ).

Figures

FIGURE 1. Geographic distribution of Heteroscelis Latreille, 1829. The countries highlighted for each species on the small maps are based on literature data. The points marked for each species are from the specimens examined in this paper, and from records retrieved from iNaturalist.

FIGURE 25. Heteroscelis robustus Thomas, 1992, female. A, dorsal; B, ventral; C, lateral; D, head and pronotum (dorsal); E, external scent efferent system; F, tibial expansion. Scale bars: A–D = 2mm, E, F = 1mm.

FIGURE 26. Heteroscelis robustus Thomas, 1992, male holotype.A–E, dorsal, ventral, lateral, posterior, and labels, respectively (CAS). Scale bars: A–C = 4mm, D = 1mm. © by California Academy of Sciences, California, United States of America, Christopher C. Grinter; published with permission.

FIGURE 27. Heteroscelis robustus Thomas, 1992, male. A–F, pygophore, posterior (A, B), dorsal (C, D), and ventral (E, F). Abbreviations: dr = dorsal rim; pa = posterolateral angles; par = parameres; ps = pseudoclaspers; vr = ventral rim; X = segment X. Scale bar = 0.5mm.

FIGURE 28. Heteroscelis robustus Thomas, 1992, male. A–D, phallus, ventral (A), dorsal (B), lateral (C), and posterior (D). Abbreviations: bf = basal foramen; bt = basal theca; cdl = conjunctival dorsal lobe; cvl = conjunctival ventral lobe; ds = ductus seminis; er = ejaculatory reservoir; sc = ventral lobe sclerotizaion; ts = thecal shield; v = vesica. Scale bar = 0.5mm.

FIGURE 29. Heteroscelis robustus Thomas, 1992, female.A, B, genital plates, ventroposterior; C, D, internal genitalia, ventral. Abbreviations: cs = capsula seminalis; id = inner duct of vesicular area; laVIII = laterotergites VIII; laIX = laterotergites IX; md = median duct of vesicular area; od = outer duct of vesicular area; pi = pars intermedialis; tgIX = secondary thickening of valvulae IX; vfVIII = valvifer VIII; vfIX = valvifer IX; vi = thickening of vaginal intima; X = segment X. Scale bars = 1mm.