Ischnopelta confusa 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 : 120-124

publication ID 10.11646/megataxa.6.2.3


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scientific name

Ischnopelta confusa Rosso & Campos

sp. nov.

Ischnopelta confusa Rosso & Campos , sp. n. ( Figs. 5C View FIGURE 5 , 16–17 View FIGURE 16 View FIGURE 17 )

Etymology. Epithet proposed by Dr. H. Ruckes as registered in the manuscripts found with the specimens used in the study. He considered the species could be easily confounded with I. scutellata , from which the epithet is inferred. Latin: confusio = mixture, disorder.

Type locality. ARGENTINA, Formosa, Formosa [- 26.366667, -58.583333] GoogleMaps .

Holotype. Male. ARGENTINA, Formosa, Formosa (45 km SW Formosa), 28.I.1989, C. W. & L. B. O’Brien & G. Wibmer. Deposited at Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” ( MACN), Buenos Aires, Argentina.

Paratypes. 3 males and 4 females. ARGENTINA, Misiones , Loreto , 2 males and 2 females, IX.1954, [- 27.3364, -55.5222], ( AMNH) GoogleMaps ; 1 female, XII.1955, [- 27.3364, -55.5222], ( UFRG); Santa Maria GoogleMaps , 1 male and 1 female, XI.1962, M. J . Viana, [-27.9036, -55.3854], ( MACN) GoogleMaps .

Description. The overall somatic morphology is as described for I. scutellata , except for the following features. Dorsal body surface brownish.

Head. Labium reaching the metacoxae. Labrum inserted posterior to half the distance between the anterior margin of the eyes and the apex of mandibular plates. Antennae: segments I to III dark yellowish, segments IV and V dark brown; segments ratio: I>II<III≤IV<V.

Thorax. Hemelytra: conspicuous spot at apex of radial vein. Pro-, meso- and metapleura densely punctured. Setae on posterodorsal margin of protibiae as long as the others.

Abdomen. Dark spots at the lateral of urosternites wide and irregularly shaped.

Male. Apical margin of the membrane of hemelytra subrectilinear; urosternite VII not reaching anteriorly the imaginary line between the spiracles of sternite V; posterolateral angles of urosternite VII unarmed.

Genitalia. Dorsal rim of pygophore concave, ventral rim slightly concave ( Figs. 16C View FIGURE 16 , dr; 16D, vr) with 1 + 1 lateral subtriangular projections ( Fig. 16C–E View FIGURE 16 , pr). Posterolateral angles almost as long as the rest of the pygophore, perpendicular to the frontal plane and subparallel to each other ( Fig. 16C–E View FIGURE 16 , pla). Setae short and sparse on posterior half of ventral and lateral surfaces of the pygophore, and on the outer surface of posterolateral angles; long setae on ventral rim, forming a 1 + 1 tufts on median portion; setae on the inner surface of posterolateral angles. Segment X slightly wider than long, surpassing the apex of posterolateral angles and parameres; apical margin subrectilinear; lateral margins strongly convex; basal and apical margins and mid-basal regions membranous; covered by long setae ( Fig. 16L–M View FIGURE 16 ). Parameres spatulate, flat, longer than posterolateral angles and subparallel to the frontal lobe; outer margin sinuous on proximal half and strongly convex on distal half; inner margin sinuous, distal portion with a recession followed by a short process, truncate and convergent; apical margin convex; head ventral surface with an oblique crest, setose ( Fig. 16F–I View FIGURE 16 ). Cup-like sclerites externally visible and with subparallel apices ( Fig. 16D View FIGURE 16 , cls). Phallus: proximal half of vesica almost as wide as phallotheca; distal half of vesica strongly sclerotized, sinuous, and gradually tapering, distal portion posteriorly directed; secondary gonopore circular ( Fig. 16J–K View FIGURE 16 ).

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 sternite VII concave; projections of urosternite VII as described for I. scutellata ( Fig. 17C View FIGURE 17 , mpr). Genitalia: Valvifers VIII as wide as long, posterior margin sinuous; sutural margins subrectilinear and dorsally folded; surface dark yellowish, with brown punctures and setae on the distal portion of sutural rim; longitudinal grooves narrow and shallow on basal surface; a wide and deep groove forming a fold on the distal half of sutural margins ( Figs. 5C View FIGURE 5 ; 17C View FIGURE 17 , vf8).Valvifers IX covered by valvifers VIII, lateral margin convex ( Fig. 17D View FIGURE 17 , vf9). Laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin convex; setae on mid-basal portion of lateral margin and ventral surface ( Fig. 17C–D View FIGURE 17 , la9). Thickening of vaginal intima barrel shaped, wider than long; proximal and distal margins concave, the distal one more sclerotized; extensive central area and elliptical areas on the laterals membranous ( Fig. 17D View FIGURE 17 , vi). Vesicular area: anterior portion to the collar 1/5 of the posterior portion; median duct anterior to the collar with proximal widening ( Fig. 17D View FIGURE 17 , mdp), median duct posterior to the collar with proximal and distal widening ( Fig. 17D View FIGURE 17 , md). Distal ductus receptaculi 0.35 times the length of vesicular area posterior to the collar ( Fig. 17D View FIGURE 17 , drd, drp). Pars intermedialis conical, broader distally ( Fig. 17D View FIGURE 17 , pi); annular crests convergent, the proximal one half the diameter of distal one ( Fig. 17D View FIGURE 17 , dac, pac). Capsula seminalis oval, longer than wide and with long laterobasal projection directed to the pars intermedialis ( Fig. 17D View FIGURE 17 , cs, pr).

Measurements: Table 5.

Distribution. Argentina ( Formosa, Misiones) ( Fig. 6 View FIGURE 6 ).

Comments. The males of Ischnopelta confusa sp. n. ( Fig. 16A–B View FIGURE 16 ) differ from other species by the the posterolateral angles of pygophore divided in two portions, being the ventral portion easily observed in posterior view ( Fig. 16C–E View FIGURE 16 , pla, pr). The females can be identified by the presence of a fold following the distal half of the sutural margin of valvifers VIII ( Figs. 5C View FIGURE 5 ; 17C View FIGURE 17 , vf8). Although this feature also occurs in Ischnopelta magna sp. n. ( Figs. 5D View FIGURE 5 ; 33C View FIGURE 33 , vf8), I. confusa is shorter in size and with the projections of urosternite VII laminate and slightly oblique ( Fig. 17C View FIGURE 17 , mpr), while in I. magna the projections are thickened and perpendicular to the urosternite surface ( Fig. 33C View FIGURE 33 , mpr).


University of Copenhagen


Naturhistorisches Museum Wien


Nationaal Herbarium Nederland, Leiden University branch


Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet


Conservatoire et Jardin botaniques de la Ville de Genève


Museo Argentino de Ciencias Naturales Bernardino Rivadavia


American Museum of Natural History


Instituto de Biologia


Botanische Staatssammlung München


University of the Witwatersrand













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