Ischnopelta montana 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 : 158-161

Ischnopelta montana Rosso & Campos , sp. n. ( Figs. 5R , 36–37 )

Etymology. The epithet refers to the mountain habitats of the specimens used in the description, collected in altitudes above 1,100m at the Caraça and Cipó Mountains, components of the geological province of Serra do Espinhaço, southeast of Minas Gerais state, Brazil. Latin: montanus = of mountains, belonging to the mountain.

Type Locality. BRAZIL, Minas Gerais, Catas Altas [-20.102777. -43.491666].

Holotype. Male. BRAZIL, Minas Gerais, Catas Altas, XI.1961, Kloss, Lenko, Martins & Silva. Deposited at Museu de Zoologia da Universidade de São Paulo ( MZSP), São Paulo ( SP), Brazil.

Paratypes. 3 males and 2 females. BRAZIL, Minas Gerais, Santana do Riacho, Serra do Cipó district (old Cardeal Mota district ), (20 km NE, Rod. MG 10 , km 114) , 1 female, 6.XI.1997, T . J. Henry & A. Paula, [-19.280555, -43.549444], ( USNM); Catas Altas (Caraça, Serra do Caraça ) , 3 males and 1 female 23–26.XI.1960, U. R . Martins, [-20.102777, -43.491666], ( MZSP) .

Description. The overall somatic morphology is as described for I. scutellata , except for the following features. Body densely punctured, brownish. Head. Setae on mid-apical region of ventral surface of mandibular plates longer than in most species.Bucculae slightly higher than the first labial segment. Labrum inserted posteriorly to half the distance between the anterior margin of the eyes and apex of mandibular plates. Antennae: segment I dark yellowish with brown blotches; segments II and III brown ventrally and dark yellowish dorsally, distal half of segment II and segment III densely punctured; segments IV and V dark brown; segments ratio: I≥II<III<IV<V.

Thorax. Hemelytra: corium as long as scutellum; conspicuous spot at apex of radial vein. Pro- and mesosternum punctured. Pro-, meso- and metapleura dark yellowish.. Setae on posterodorsal margin of protibiae as long as the others.

Abdomen. Dark spots at the lateral of urosternites narrow and subtriangular, the anterior than the posterior.

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 slightly concave ( Fig. 36C , dr) and ventral rim sinuous ( Fig. 36D , vr). Posterolateral angles 0.9 times smaller than the rest of the pygophore, perpendicular to the frontal plane, divergent from the base, apices sharply rounded ( Fig. 36C–E , pla). Setae short and sparse on distal half of ventral and lateral surfaces of the pygophore; setae long and dense on the ventral rim and ventral and apical margins of the posterolateral angles. Segment X as long as wide, surpassing the apex of posterolateral angles, but not the parameres; rounded; dorsal surface sclerotized, membranous on the apical margin and small mid-basal area; covered by setae, longer and denser on the laterobasal margins ( Figs. 36C–E, X; 36L–M ). Parameres elongated, slightly swollen, longer than posterolateral angles; head subtriangular oblique to the frontal plane; outer and inner margins sinuous; distal half of inner margin with median excavation and more sclerotized; apices narrow and convergent ( Figs. 36D–E , pa; 36F–I). Cup-like sclerites visible, apices narrow and convergent. Phallus: proximal portion of vesica biconvex laterally, dorsal surface flatand slightly depressed, ventral surface expanded and with minute ventroposterior process; median portion cylindrical, posteriorly directed; distal portion sinuous, ventroposteriorly directed; secondary gonopore beveled ( Fig. 36J–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 of urosternite VII subrectilinear; projections of urosternite VII thick and perpendicular to the surface, folded beneath the urosternite. Genitalia. Valvifers VIII wider than long; posterior margin sinuous, lateral angles round and projected; sutural angles narrowly rounded; sutural margins subrectilinear and folded dorsally; surface longitudinally convex, dark yellowish with brown punctures, setae on the median portion of posterior margin ( Figs. 5R ; 37C , vf8). Valvifers IX covered by valvifers VIII. Laterotergites IX not reaching the posterior margin of mediotergite VIII, largely covered by valvifers VIII ( Fig. 37C , la9); lateral margin of visible portion convex. Internal genitalia not examined.

Measurements: Table 16.

Distribution. Brazil (Minas Gerais) ( Fig. 8 ).

Comments. See comments in I. cordiformis sp. n.. The material available for the description of Ischnopelta montana sp. n. is greatly damaged. As in I. cylindrata sp. n. ( Fig. 26A–B ), the setae of the mid-apical band of ventral surface of the mandibular plates are about three times longer than those observed in the other species.

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 26. Ischnopelta cylindrata Rosso & Campos, sp. n. Holotype 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; mpr, projection on the lateral third of posterior margin of sternite VII; 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.

FIGURE 36. Ischnopelta montana Rosso & Campos, sp. n. Holotype male.A, dorsal view; B, ventral view; C–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: dr, dorsal rim; pa, parameter; ph, phalloteca; pla, posterolateral angle; vr, ventral rim; vs, vesica; X, segment X.

FIGURE 37. Ischnopelta montana Rosso & Campos, sp. n. Female. A, dorsal view; B, ventral view; C, genital plates ventroposterior view (45º). Abbreviations: la8, laterotergite 8; la9, laterotergite 9; mpr, projection on the lateral third of posterior margin of sternite VII; t8, mediotergite VIII; vf8, valvifer 8; X, segment X.