Ischnopelta wigodzinskyi Rosso & Campos

Rosso, Pedro & Campos, Luiz Alexandre, 2021, Revision of Ischnopelta Stål, 1868 with the description of twenty new species (Hemiptera: Pentatomidae: Discocephalinae), Megataxa 6 (2), pp. 96-184 : 179-183

Ischnopelta wigodzinskyi Rosso & Campos , sp. n. ( Figs. 5N , 48–49 )

Etymology. Epithet probably proposed by Dr. Miriam Becker in honor of Petr Wolfgang Wygodzinsky (5.X.1916 – 27.I.1987), German entomologist which worked in Argentina, Brazil, and United States of America, especially with Reduviidae .

Type locality. BRAZIL, Goiás, Corumbá de Goiás [-15.9275, -48.8103] .

Holotype. Male. BRAZIL, Goiás, Corumbá de Goiás, 4.II.1962, J. & B. Bechyné. Deposited at Museu Paraense Emilio Goeldi ( MPEG), Belém ( PA), Brazil.

Paratypes.3malesand 9females. BRAZIL, Tocantins, Palmas (Fazenda Céu, Serra do Lageado ), 1 male and 1 female, XI.1992, Exp. MCN / MZSP , [-10.1669, -48.3328], ( MCNZ); Dianópolis , 1 male and 1 female, 16–22. I .1962, J . Bechyné Col. , [-11.6278, -46.8208], ( MZSP); 1 female, 24. I .1962, J. Bechyné col., [-11.6278, -46.8208], ( MPEG); Goiás, Minaçú ( Serra da Mesa ), 1 female, 19–30.XI.1996, L. Moura col. , [-13.5365, -48.2212], ( UFRG), Corumbá de Goiás, 1 female, 31. I .1962, J. & B . Bechyné , [-15.9275, -48.8103], ( MPEG); 1 males and 4 females, 4. II .1962, J. & B . Bechyné , [-15.9275, -48.8103], ( MPEG) .

Description. The overall somatic morphology is as described for I. scutellata , except for the following features. Head. Labrum inserted anteriorly to half the distance between the anterior margin of the eyes and the apex of mandibular plates. Antennae: segment I dark yellowish; segments II and III dorsally dark yellowish and ventrally brown, segment III dorsally punctured; segments IV and V brown; segments ratio: I>II<III<IV<V.

Thorax. Hemelytra: corium as long as scutellum; conspicuous spot at apex of the radial vein.

Abdomen. Male urosternite VII unarmed.

Male. Apical margin of membrane of hemelytra convex; median portion of posterior margin of urosternite VII concave; urosternite VII not reaching anteriorly the imaginary line connecting the spiracles of sternite V. Genitalia. Pygophore with dorsal rim sinuous ( Fig. 48C , dr) and ventral rim shallowly concave ( Fig. 48D , vr). Posterolateral angles 0.3 times shorter than the rest of the pygophore, perpendicular to the frontal plane and subparallel ( Fig. 48C–E , pla). Setae short in a band on the ventral rim and outer surface of the posterolateral angles; 1 + 1 tufts of long setae on apices of posterolateral angles. Segment X wider than long, surpassing the apex of parameres and posterolateral angles; cordiform; laterobasal surface more sclerotized and densely covered by setae, apical margin sclerotized, emarginated and covered by setae; mid-longitudinal region membranous ( Figs. 48C and E, X; 48L–M ). Parameres spatulate, flat, oblique to the frontal plane; outer margin sinuous, distal portion strongly convex; inner margin sinuous; apical margin sinuous and forming a minute process on the inner margin; apical portion covered by setae ( Figs. 48D–E , pa; 48F–I). Cup-like sclerites externally visible ad with divergent apices ( Fig. 48D , cls). Phallus: proximal portion of vesica almost as wide as distal margin of phallotheca, ventrally and dorsoposteriorlly expanded; distal portion subcylyndrical and ventrally directed; apical portion posteriorly directed; secondary gonopore beveled ( Fig. 48J–K ).

Female. Membrane of hemelytra not reaching the posterior margin of mediotergite VIII, posterior margin convex; median portion of posterior margin of mediotergite VIII and median portion of posterior margin of urosternite VII subrectilinear; projections on the lateral 1/3 of posterior margin of urosternite VII absent.

Genitalia. Valvifers VIII wider than long; posterior margin sinuous with a triangular projection at the lateral angle; sutural margins subrectilinear and folded dorsally; surface dark yellowish with brown punctures, setae on the sutural margins and on median portion of the posterior margin; longitudinal grooves narrow and shallow on basal portion ( Figs. 5N ; 49C , vf8). Valvifers IX covered by the valvifers VIII, lateral margin subrectilinear, setae on mid-basal portion of ventral surface ( Fig. 49C–D , vf9). Laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin convex; setae on midbasal portion of lateral margin and ventral surface ( Fig. 49C–D , la9). Thickening of vaginal intima sub hexagonal, wider than long; distal margin weakly emarginated; laterals weakly sclerotized; median subrectangular area membranous ( Fig. 49D , vi). Vesicular area anterior to the collar 1/7 of the posterior portion; median duct anterior to the collar with slight proximal widening ( Fig. 49D , mdp); median duct posterior to the collar with proximal and distal widening ( Fig. 49D , md); inner duct coiled in the proximal widening ( Fig. 49D , id). Distal ductus receptaculi of same caliber as the proximal ( Fig. 49D , drd, drp). Pars intermedialisbroader distally ( Fig. 49D , pi); proximal annular crest directed to the ductus receptaculi; distal annular crest perpendicular to the pars intermedialis ( Fig. 49D , dac, pac). Capsula seminalis globose; long and sinuous laterobasal projection surpassing the proximal annular crest; laterodistal projection short ( Fig. 49D , cs, pr).

Measurements: Table 22.

Distribution. Brazil (Tocantins, Goiás) ( Fig. 8 ).

Comments. See comments in I. vellozia sp. n.. The segment X on males of Ischnopelta wigodizinkyi sp. n., although cordiform, has the apical margin less emarginated, and the setae denser on the laterobasal margins ( Fig. 48L–M ).

Figures

FIGURE 5. Female genital plates.A, Ischnopelta scutellata (Signoret, 1851); B, Ischnopelta bechyneorum Rosso & Campos, sp. n.; C, Ischnopelta confusa Rosso & Campos, sp. n.; D, Ischnopelta magna Rosso & Campos, sp. n.; E, Ischnopelta cylindrata Rosso & Campos, sp. n.; F, Ischnopelta impunctata Rosso & Campos, sp. n.; G, Ischnopelta luteicornis (Walker, 1867); H, Ischnopelta cristulata Rosso & Campos, sp. n.; I, Ischnopelta coralinae Rosso & Campos, sp. n.; J, Ischnopelta ruckesi Rosso & Campos, sp. n.; K, Ischnopelta pellucidula Rosso & Campos, sp. n.; L, Ischnopelta parvula Rosso & Campos, sp. n.; M, Ischnopelta vellozia Rosso & Campos, sp. n.; N, Ischnopelta wigodzinskyi Rosso & Campos, sp. n.; O, Ischnopelta alalonga Rosso & Campos, sp. n.; P, Ischnopelta crassula Rosso & Campos, sp. n.; Q, Ischnopelta cordiformis Rosso & Campos, sp. n.; R, Ischnopelta montana Rosso & Campos, sp. n.; S, Ischnopelta guarani Rosso & Campos, sp. n.; T, Ischnopelta marginella Rosso & Campos, sp. n.. Abbreviations: vf8, valvifers VIII; la8, laterotergites VIII; la9, laterotergites IX; mpr, projection on the lateral third of posterior margin of sternite VII; t8, mediotergite VIII; X, segment X. Scale bars = 1 mm.

FIGURE 8. Distribution of Ischnopelta marginella Rosso & Campos, sp. n.; Ischnopelta montana Rosso & Campos, sp. n.; Ischnopelta paiagua Rosso & Campos, sp. n.; Ischnopelta parvula Rosso & Campos, sp. n.; Ischnopelta pellucidula Rosso & Campos, sp. n.; Ischnopelta ruckesi Rosso & Campos, sp. n.; Ischnopelta vellozia Rosso & Campos, sp. n.; Ischnopelta wigodzinskyi Rosso & Campos, sp. n..

FIGURE 48. Ischnopelta wigodzinskyi Rosso & Campos, sp. n. Holotype male. A, dorsal view; B, ventral view; –E, pygophore: dorsal, ventral and posterior views respectively; F–I, parameters: dorsal, ventral, external and internal lateral views, respectively; J–K, phallus: lateral and dorsal views, respectively; L–M, segment X, dorsal and ventral views, respectively. Abbreviations: cls, cup like sclerites; dr, dorsal rim; pa, parameter; ph, phalloteca; pla, posterolateral angle; vr, ventral rim; vs, vesica; X, segment X.

FIGURE 49. Ischnopelta wigodzinskyi Rosso & Campos, sp. n. Female. A, dorsal view; B, ventral view; C, genital plates ventroposterior view (45º); D, internal genitalia. Abbreviations: cl, collar; cs, seminalis capsule; dac, distal annular crest; drd, distal ductus receptaculi; drp, proximal ductus receptaculi; id, internal duct; idp, proximal internal duct; la8, laterotergite VIII; la9, laterotergite IX; md, medium duct; mdp, proximal medium duct; od, external duct; odp, proximal external duct; pac, proximal annular crest; pi, pars intermedialis; pr, projection; t8, mediotergite VIII; va9, valvulae IX; vf8, valvifer VIII; vf9, valvifer IX; vi, thickening of vaginal intima; X, segment X.