Ischnopelta cristulata 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 : 135-138

publication ID 10.11646/megataxa.6.2.3


persistent identifier

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scientific name

Ischnopelta cristulata Rosso & Campos

sp. nov.

Ischnopelta cristulata Rosso & Campos , sp. n. ( Figs. 5H View FIGURE 5 , 24–25 View FIGURE 24 View FIGURE 25 )

Etimology. The epithet refers to the presence of a transverse small crest on the ventral surface of parameres. Latin: cristula = small crest.

Type locality. BRAZIL, Mato Grosso, Rondonópolis [-16.4679, -54.6414] GoogleMaps .

Holotype. Male. BRAZIL, Mato Grosso, Rondonópolis, XI.1963, M. Alvarenga. Deposited at Museu de Entomologia Pe. Jesus Santiago Moure, Universidade Federal do Paraná ( DZUP), Curitiba (PR), Brazil.

Paratypes. 4 males and 14 females. BRAZIL, Rondônia, Vilhena , 1 female, 21. II.1961, J. & B. Bechyné, [-12.7363, -60.1309], ( MPEG); GoogleMaps Mato Grosso, Campo Novo do Parecis, Utiariti ( Papagaio river ), 2 males and 6 females, 7.VIII.1961, K GoogleMaps . Lenko, [-13.0215, -58.2870], ( UFRG) GoogleMaps , 1 female, 22–31.X.1966, K. Lenko, [-13.0215, - 58.2870], ( UFRG); Rondonópolis , 2 males and 2 females, XI.1963, M. Alvarenga, [-16.4679, -54.6414], ( DZUP); Mato Grosso do Sul, Campo Grande, Indubrasil ( N. O. B zone), 4 females, 17.X.1938, Exp. Instituto Oswaldo Cruz, [-20.4775, -54.762222], ( FIOC) GoogleMaps .

Description. The overall somatic morphology is as described for I. scutellata , except for the following features. Head. Labrum inserted anterior to half the distance between the anterior margin of the eyes and the apex of mandibular plates. Antennae dark yellowish, segments IV and V slightly darker than others, some with minute punctures on segments II and III; segments ratio: I<II<III<IV<V.

Thorax. Hemelytra: corium as long as scutellum; conspicuous spot at apex of radial vein. Membrane with veins ramified. Setae on posterodorsal margin of protibiae as long as the others.

Abdomen. Dark spots at the lateral of urosternites subequal, both narrow; 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 urosternite V.

Genitalia. Pygophore with dorsal rim concave and median portion subrectilinear ( Fig. 24C View FIGURE 24 , dr); ventral rim slightly concave ( Fig. 24D View FIGURE 24 , vr). Posterolateral angles 1.24 times longer than the rest of the pygophore, base perpendicular and apex oblique to the frontal plane, convergent from the base ( Fig. 24C–E View FIGURE 24 , pla). Short setae on distal half of ventral and lateral surface of pygophore, and on outer and inner surfaces of posterolateral angles; long setae on ventral rim, except on median portion, and on ventral and apical magins of posterolateral angles. Segment X slightly wider than long, not reaching the apex of posterolateral angles and parameres; rounded; apical margin flat and membranous, lateral margins convex, more sclerotized and covered by long setae; median portion membranous, covered by short setae ( Figs. 24C–E, X; 24L–M View FIGURE 24 ). Parameres falciform, flat, surpassing the apical margin of segment X, and reaching the apex of posterolateral angles; subparallel to the frontal plane; proximal portion of the outer margin slightly concave, apical portion strongly convex; inner margin sinuous, distal portion strongly escavated and with an apical aculeiform process, convergent and ventrolaterally directed; apical margin convex; ventral surface with a transverse crest delimiting the apical region ( Fig. 24G View FIGURE 24 , vcp); setae covering the crest and the area posterior to it ( Figs. 24D View FIGURE 24 , pa; 24F–I). Cup-like sclerites externally visible and with convergent apices ( Fig. 24D View FIGURE 24 , cls). Phallus: proximal 2/3 of vesica dorsally convex and ventroposteriorly directed, base as wide as apical margin of phallotheca, gradually narrowing posteriorly, expanded ventrally; distal 1/3 sinuous; secondary gonopore ventroposterior and beveled ( Fig. 24J–K View FIGURE 24 ).

Female. Membrane of hemelytra not reaching the posterior margin of mediotergite VIII, posterior margin convex; median portion of subrectilinear; median portion of posterior margin of urosternite VII convex; posterior margin of mediotergite VIII and projections of urosternite VII ( Fig. 25C View FIGURE 25 , mpr) as described for I. scutellata .

Genitalia. Valvifers VIII wider than long; posterior margin subrectilinear and slightly oblique to the median line, sutural margins subrectilinear and folded dorsally; surface dark yellowish with punctures and brown blotches; setae on distal portion of sutural margins and on median half of posterior margin ( Figs. 5H View FIGURE 5 ; 25C View FIGURE 25 , vf8). Valvifers IX covered by valvifers VIII, lateral margin convex; setae on mid-basal portion of ventral surface ( Fig. 25D View FIGURE 25 , vf9). Laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin subrectilinear; setae on mid-basal portion of lateral margin and ventral surface ( Fig. 25C–D View FIGURE 25 , la9). Thickening of vaginal intima wider than long; distal margin more sclerotized and slightly concave; lateral margins convex, broad mid-basal area membranous ( Fig. 25D View FIGURE 25 , vi). Vesicular area: anterior portion to the collar 1/9 of posterior portion, median duct anterior to the collar with slight proximal widening ( Fig. 25D View FIGURE 25 , mdp); median duct posterior to the collar with proximal widening ( Fig. 25D View FIGURE 25 , md); inner duct curved, almost coiled, in the proximal widening ( Fig. 25D View FIGURE 25 , id). Distal ductus receptaculi 0.5 times the length of vesicular area posterior to the collar ( Fig. 25D View FIGURE 25 , drd, drp). Pars intermedialis cylindrical ( Fig. 25D View FIGURE 25 , pi); annular crests perpendicular to the pars intermedialis, the distal 1/3 larger than proximal one ( Fig. 25D View FIGURE 25 , dac, pac). Capsula seminalis globose with a long filiform lateral projection directed to the pars intermedialis ( Fig. 25D View FIGURE 25 , cs, pr).

Measurements: Table 9.

Distribution. Brazil (Rondônia, Mato Grosso, Mato Grosso do Sul) ( Fig. 7 View FIGURE 7 ).

Comments. Ischnopelta cristulata is distinguished from I. coralinae sp. n., I. impunctata sp. n., I. luteicornis , I. parvula sp. n., I. pellucidula sp. n. and I. ruckesi sp. n., by the subrectilinear and transverse crest on the ventral surface of parameres ( Figs. 18D, G View FIGURE 18 , vcp; 24G, vcp; 29D, G, vcp; 31D, G, vcp; 39D, vcp; 43B, E, vcp; 44D, G, vcp). See comments in I. coralinae sp. n..


Botanische Staatssammlung München


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


University of the Witwatersrand


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


Museu Paraense Emilio Goeldi


Royal Botanic Gardens


Instituto de Biologia


Nanjing University


Botanical Museum - University of Oslo


Fundacao Instituto Oswaldo Cruz













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