Ischnopelta cordiformis 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 : 128-131

publication ID 10.11646/megataxa.6.2.3


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scientific name

Ischnopelta cordiformis Rosso & Campos

sp. nov.

Ischnopelta cordiformis Rosso & Campos , sp. n. ( Figs. 5Q View FIGURE 5 , 20–21 View FIGURE 20 View FIGURE 21 )

Etymology. The epithet refers to the shape of the male segment X. Latin: cordis = heart + formis = form, shape.

Type locality. BRAZIL, Mato Grosso, Santa Terezinha [-10.646111, -50.613056] GoogleMaps .

Holotype. Male. BRAZIL, Mato Grosso, Santa Terezinha (mouth of Rio Tapirapé ), 26.XII.1962, B. Malkin. Deposited at Museu Paraense Emilio Goeldi ( MPEG), Belém ( PA), Brazil.

Paratypess. 1 male and 2 females. BRAZIL, Mato Grosso, Santa Terezinha (mouth of Rio Tapirapé ) , 1 female, 1.X.1963,[-10.646111, -50.613056],( CAS); Santa Terezinha ( Porto Velho ) GoogleMaps , 1 female, 15.XI–15.XII.1962, R . Pinheiros, [-10.7728, -51.0056], ( DZUP); São Félix do Araguaia GoogleMaps , 1 male, VI.1961, M . Alvarenga, [-11.6169, -50.6689], ( CAS) GoogleMaps .

Description. The overall somatic morphology is as described for I. scutellata , except for the following features. Male and female respectively 2 and 2.1 times longer than wide. Head. Labium reaching the metacoxae. Labrum inserted anterior to half the distance between the anterior margin of the eyes and the apex of mandibular plates. Antennae segments I to III dark yellowish with brown blotches and punctures, segments IV and V brown; segments ratio: I>II<III<IV<V.

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

Male. Apical margin of membrane of hemelytra convex; median portion of posterior margin of urosternite VII subrectilinear; urosternite VII reaching anteriorly the imaginary line connecting the spiracles of sternite V. Genitalia. Pygophore with dorsal rim concave ( Fig. 20C View FIGURE 20 , dr) and ventral rim slightly concave ( Fig. 20D View FIGURE 20 , vr). Posterolateral angles 0.5 times shorter than the rest of the pygophore, perpendicular to the frontal plane and divergent from the base ( Fig. 20C–E View FIGURE 20 , pla). Setae short and sparse on posterior half of ventral and lateral surfaces of pygophore; setae long and dense on ventral rim and on ventral and apical margins of posterolateral angles. Segment X wider than long, surpassing the apex of posterolateral angles, but not the parameres; cordiform; apical margin sclerotized and emarginated; lateral margins sclerotized and covered by long setae, mid-longitudinal region membranous and with short and sparse setae ( Figs. 20C and E, X; 20L–M View FIGURE 20 ). Parameres claviform, head wide, oblique to the frontal plane; outer margin sinuous, slightly concave on proximal half and strongly convex on distal half; inner margin sinuous, distal portion strongly sclerotized, sinuous; apical process convergent; setae covering the ventral distal half of the head, and the sclerotized area ( Figs. 20D View FIGURE 20 , pa; 20F– I). Cup-like sclerites externally visible, apices rounded and subparalel. Phallus: proximal half of vesica broader laterally, dorsally flattened and ventrally expanded; distal half sinuous; secondary gonopore ventral and beveled ( Fig. 20J–K View FIGURE 20 ).

Female. Membrane of hemelytra not reaching the posterior margin of mediotergite VIII, posterior margin convex; median portion of posterior margin of both mediotergite VIII and urosternite VII subrectilinear; projections on the lateral 1/3 of posterior margin of sternite VII undeveloped ( Fig. 21C View FIGURE 21 ). Genitalia. Valvifers VIII wider than long; posterior margin sinuous, moderately oblique to the median line, portion on the sutural margins narrow and acutely rounded, lateral portion slightly concave; sutural margins subrectilinear and folded dorsally; surface convex, dark yellowish with brown punctures and setae on sutural margins and sutural angles ( Figs. 5Q View FIGURE 5 ; 21C View FIGURE 21 , vf8). Valvifers IX almost completely covered by valvifers VIII; lateral margin subrectilinear; setae on mid-basal portion of ventral surface ( Fig. 21C–D View FIGURE 21 , vf9). Laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin sinuous; setae on median portion of lateral margin and mid-basal portion of ventral surface ( Fig. 21C–D View FIGURE 21 , la9). Thickening of vaginal intima subcircular, slightly wider than long; distal portion more sclerotized; apical margin slightly concave, ventral cone membranous, oval ( Fig. 21D View FIGURE 21 , vi). Vesicular area: anterior portion to the collar 1/8 of the posterior portion; median duct anterior to the collar with slight proximal widening ( Fig. 21D View FIGURE 21 , mdp); median duct posterior to the collar with both proximal and distal widening ( Fig. 21D View FIGURE 21 , md); inner duct coiled in the proximal widening of the median duct ( Fig. 21D View FIGURE 21 , id). Pars intermedialis and capsula seminalis not examined.

Measurements: Table 7.

Distribution. Brazil (Mato Grosso) ( Fig. 7 View FIGURE 7 ).

Comments. Although the posterior margin of valvifers VIII of Ischnopelta cordiformis sp. n. is similar to I. montana sp. n., in I. cordiformis the sutural portion is more angular and the median portion is subrectilinear ( Figs. 5Q View FIGURE 5 ; 21C View FIGURE 21 , vf8), while in I. montana the sutural portion is strongly convex, and the lateral portion is concave ( Figs. 5R View FIGURE 5 ; 37C View FIGURE 37 , vf8). Besides that, the lateral abdominal margins in I. montana are delineate by an unpunctured narrow band where two subtriangular darkbrown spots are observed on the laterals of the urosternites (Fig, 37B), while in I. cordiformis the punctures extend close to the abdominal margins, leaving only small unpunctured areas, and the lateral spots are narrower and irregular, sometimes elongated (Fig, 21B). Lastly, females of I. cordiformis do not present sclerotized rims on the lateral 1/3 of posterior margin of urosternite VII. The undeveloped posterolateral angles, and the cordiform segment X with broad membranous area in I. cordiformis ( Figs. 20C–D View FIGURE 20 , pla; 20L–M) allows to easily distinguish it from I. montana , whose posterolateral angles are more developed and subtriangular, and the segment X is rounded and strongly sclerotized ( Figs. 36C–D View FIGURE 36 , pla; 36L–M).


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


Museu Paraense Emilio Goeldi


Universidade Federal do Oeste do Pará


California Academy of Sciences


Departamento de Geologia, Universidad de Chile


Universidade Federal do Parana, Colecao de Entomologia Pe. Jesus Santiago Moure


Mykotektet, National Veterinary Institute


Botanische Staatssammlung München













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