Ischnopelta Stål, 1868

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 : 98-104

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https://doi.org/ 10.11646/megataxa.6.2.3

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https://doi.org/10.5281/zenodo.5753469

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Ischnopelta Stål, 1868
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Ischnopelta Stål, 1868

Discocephala (Ischnopelta) Stål, 1868: 18 ; Stål, 1872: 6; Lethierry & Severin, 1893: 83.

Ischnopelta: Berg, 1891: 238 ; Kirkaldy, 1909: 215; Rolston, 1990: 15, 19–20; Grazia et al., 2015: 712.

Type species: Discocephala scutellata Signoret, 1851 ( Figs. 9–10 View FIGURE 9 View FIGURE 10 ), posteriorly designated by Kirkaldy (1909).

Description.Bodyellipticalelongated, dorsoventrally flattened; dorsal surface slightly convex with dense brown to ferruginous punctures randomly distributed; punctures may form short and irregular lines; ventral surface flattened, with brown to ferruginous punctures. Male body length between 0.8 and 0.9 times the female length.

Head semicircular, wider than long. Mandibular plates wide and flat, surpassing, and overlapping the clypeus anteriorly; apex usually emarginated; lateral margins with convex and reduced anteocular processes. Posterior margin slightly bending backwards on laterals; dorsal surface with small, unpunctured semicircular areas between ocelli and eyes. Ventral surface of mandibular plates with minute brown to black punctures; setae on the apical half of the lateral margins; 1 + 1 unpunctured areas lateral to the insertion of labrum. Eyes reddish brown, iridescent, and forming sharply rounded angles on mesial margin. Ocelli reddish, framed by a narrow dark brown band; placed over or slightly posterior to the internal angles of the eyes; distance between ocelli 0.32– 0.37 times the distance between eyes. Maxillary plates and ocular peduncles horn shaped. Bucculae posteriorly divergent. Labium reaching or slightly surpassing the metacoxae; bearing sparse setae; first segment more robust, insertion distal to the half of bucculae and apex surpassing the anterior margin of prosternum; distal 1/3 of segment IV black; labial groove reddish to dark brown; ratio between segments: I<II>III>IV. Antennae fivesegmented; segment I subcylindrical, moderately swollen and covered dorsally by the mandibular plates; segments II and III dorsally flat and with a shallow longitudinal groove, more apparent on II ( Fig. 2 View FIGURE 2 A−C, gr); segment IV slightly flattened; V subcylindrical; setae scarce on segments I and II and proximal half of III, denser on the distal half of segment II, and on segments IV and V.

Thorax. Pronotum subrectangular, slightly bent anteriorly; width across the humeral angles 2.2 to 2.4 times the length, and 1.1 to 1.2 times the width across the anterolateral angles. Anterior margin sinuous; anterolateral margins subrectilinear to slightly convex. Anterolateral angles of pronotum with a small projection or unarmed; humeral angles rounded and slightly swollen. Posterior margin sinuous, weakly concave over the scutellum and convex over the hemelytra. Dorsal surface predominantly convex, with a shallow transversal depression behind the cicatrices; cicatrices with irregularly distributed internal punctures. Scutellum slightly convex dorsally, almost reaching the end of the body; length 1.6 to 2 times the basal width; postfrenal lobe 1.3 to 1.7 times longer than frenal lobe; basal width 1.4 to 1.6 times the width at frenal constriction; lateral margins of the frenal lobe slightly convex; lateral margins of the post-frenal lobe subrectilinear to slightly convex; apex narrow to broadly rounded. Hemelytra: corium ranging from slightly shorter to longer than the scutellum, reaching at least the anterior margin of connexivum VII; apical angles of urosternites sharply rounded. Prosternum slightly concave. Mesosternum swollen and medially grooved. Metasternum grooved, hexagonal, posteriorly narrowed.

Evaporatorium subtriangular, velvet-like and punctured. Ostiole elliptical, ventrolaterally directed. Peritreme spout-like, grooved, slightly bentbent and not reaching the lateral margin of the evaporatorium. Metathoracic spiracle slightly longer than peritreme. Legs with clavate femora, slightly flattened laterally and with sparse setae; tibiae flattened dorsally, with a wide and shallow longitudinal groove and without setae; ventral surface with many setae; ventral surface of the protibiae swollen on the distal 2/3 ( Fig. 2D View FIGURE 2 , int) and with setae on the posterodorsal margin ( Fig. 2 View FIGURE 2 E−F, rbr). Tarsomeres I about twice the length of the II and slightly shorter than the III; tarsomeres I subcylindrical, II and II slightly flattened laterally; apical 1/3 of tarsal claws black.

Abdomen. Dorsal surface convex. Connexivum densely punctured; lateral margins of each connexival segment with 1+1 brown to dark-brown blotches separated by unpunctured areas; blotches continuous ventrally, the anterior blotch located at the anterior half of the urosternite, the posterior one next to the posterolateral angle. Urosternites slightly convex with 1+1 depressions next to the anterior margin of segments IV to VII, shallower on the last one. Elliptical spiracles outlined by a narrow bright dark-brown band. Small subcircular area between spiracles and trichobothria and part of the pseudosutures in urosternites III to VII, with a superficial aspect of minute iridescent comb (gross mode, they are visualized as an elongated light-brown blotch). Mesial trichobothria placed on the line tangent to the lateral limit of spiracles.

Male. Urosternites IV to VI progressively shorter on midline; urosternite VII on midline 1.3 times longer than IV to VI taken together (e.g., Fig. 9B View FIGURE 9 ). Anterior margin of urosternite VII widely V-shaped, almost attaining a line connecting the posterior angles of urosternite IV.

Genitalia. Pygophore dorsoventrally flat (e.g., Fig. 11E View FIGURE 11 ). Posterolateral angles not projected in some species (e.g., Fig. 4B, C View FIGURE 4 ); when projected the posterolateral angles are laterally compressed (e.g., Fig. 4A View FIGURE 4 ), lateral surface convex, mesial surface concave, rounded at apex. Segment X flattened dorsoventrally, as wide as or wider than half the width of the pygophore (e.g., Figs. 9C View FIGURE 9 ; 11C View FIGURE 11 ), and exceeding posteriorly the ventral rim by at least half the length of the segment X (e.g., Figs. 9D View FIGURE 9 ; 11D View FIGURE 11 ). Parameres inserted ventrally to segment X. Cup-like sclerite well developed, located between the parameres and usually visible ventrally posterior to the ventral rim ( Fig. 11D View FIGURE 11 , cls). Phallus: phallotheca elongated, slightly tapering towards vesica; the later broader at least at the basal 1/3, apical half or more sinuous and accompanying the ductus seminis distalis; conjunctiva absent (e.g., Fig. 9J View FIGURE 9 ).

Female. Median portion of the posterior margin of urosternite VI concave (e.g., Fig.10B View FIGURE 10 ).Genitalia.Valvifers VIII dorsoventrally flattened, usually covering the valvifers IX and at least the base of laterotergites IX ( Fig. 5 View FIGURE 5 ). Spiracles in laterotergites VIII covered by the valvifers VIII. Valvifers IX oblique posteriorly emarginated, rounded and setose at apex; suture line clearly visible (e.g., Fig. 10D View FIGURE 10 ). Laterotergites IX triangular, rounded to angular and setose at apex; free portion dorsoventrally flattened; covered portion swollen. Ring sclerites absent. Thickening of vaginal intima large, half the width of valvulae IX, discoid, and flattened dorsoventrally (e.g., Fig. 10D View FIGURE 10 ). Ductus receptaculi: outer duct of vesicular area folded over itself on the proximal portion, forming a collar ( Fig. 3 View FIGURE 3 , cl) and delimiting a narrow funnel. Median duct constricted within the collar, and usually dilated distal to the collar; inner duct uniformly cylindrical throughout its extension. Pars intermedialis narrower than capsula seminalis. Capsula seminalis globose, with one or two lateral projections.

Distribution. Venezuela, Brazil, Bolivia, Paraguay, Argentina ( Figs. 6 View FIGURE 6 ; 7 View FIGURE 7 ; 8 View FIGURE 8 ).

Comments. The characteristics proposed by Rolston (1990) for the identification of Ischnopelta in his key and diagnoses for the genera of broadheaded discocephalines are still valid. Besides the characteristics listed by Rolston (1990), the long scutellum with the frenal lobe in average 0.65 times smaller than the post-frenal in Ischnopelta , differs from the subtriangular scutellum with subequal frenal and post-frenal lobes in Discocephala ( Becker & Grazia 1992) , as well as in Nigrisagitta Rosso & Campos, 2017 ( Rosso & Campos 2017a, b). It is noteworthy that, within the broadheaded Discocephalini , the dilated distal 2/3 of protibia, the longitudinal groove on antennal segments II and III, and the collar on the proximal portion of the vesicular area in the spermatheca, were only observed in Ischnopelta . Regarding the differentiation between species of Ischnopelta , only the genital characteristics allow an unambiguous identification.

Key to the males of Ischnopelta Stål, 1868

1. Pygophore posterolateral angles perpendicular to the frontal plane, slightly bentbent ventrally, curved; apex of parameres bent lateroposteriorly; segment X longer than wide, oval, and emarginated ( Fig. 9C–M View FIGURE 9 ).......................... .............................................. I. scutellata ( Signoret, 1851)

- Pygophore posterolateral angles oblique to the frontal plane at apex, convergent from the base; apex of parameres bent laterally; segment X usually as wide as long, rounded( Figs. 18C–M View FIGURE 18 ; 24C–M View FIGURE 24 ; 29C–M View FIGURE29 ; 31C–M View FIGURE 31 ; 39C–E View FIGURE 39 ; 43A–K View FIGURE 43 ; 44C– M View FIGURE 44 ) ..................................................................................... 2

- Other combinations for the characteristics of the pygophore posterolateral angles, and for the shape of the parameres and segment X ( Fig. 4A–C View FIGURE 4 ).............................................. 8

2. Membrane of hemelytra with apical margin subrectilinear ( Figs. 29A–B View FIGURE29 ; 39A–B View FIGURE 39 ) ..................................................... 3

- Membrane of hemelytra with apical margin convex ........ 4

3. Wide blotches on lateral of urosternites; denticles on posterolateral angles of urosternite VII present ( Fig. 29B View FIGURE29 , dt)........................... I. impunctata Rosso & Campos , sp. n.

- Minute blotches on lateral of urosternites; denticles on posterolateral angles of urosternite VII absent ( Fig. 39A– B View FIGURE 39 ) ................................. I. parvula Rosso & Campos , sp. n.

4. Length of mandibular plates anterior to the clypeus shorter than 1/3 of total length of the head; ventral surface of the parameres with a longitudinal sinuous crest ( Figs. 41A–D View FIGURE 41 ; 43B and E View FIGURE 43 , vcp) ..... I. pellucidula Rosso & Campos , sp. n.

- Length of mandibular plates anterior to the clypeus equal to or larger than 1/3 of total length of the head; ventral surface of the parameres with a transversal or oblique crest ........ 5

5. Ventral surface of parameres with a transversal crest ( Fig. 24G View FIGURE 24 , vcp) .................. I. cristulata Rosso & Campos , sp. n.

- Ventral surface of parameres with an oblique crest ( Fig. 31G View FIGURE 31 , vcp) .......................................................................... 6

6. Median portion of urosternite VII reaching anteriorly the imaginary transversal line connecting the spiracles of urosternite V ( Fig. 31B View FIGURE 31 )......... I. luteicornis ( Walker, 1867)

- Median portion of urosternite VII not reaching anteriorly the imaginary transversal line connecting the spiracles of urosternite V ..................................................................... 7

7. Lateral margin of the head of parameres convex; apical margin of parameres convex ( Fig. 18D, F–H View FIGURE 18 , amp)........... .................................. I. coralinae Rosso & Campos , sp. n.

- Lateral margin of the head of parameres subrectilinear at distal portion; apical margin of parameres subrectilinear ( Fig. 44F–G View FIGURE 44 , amp) ........ I. ruckesi Rosso & Campos , sp. n.

8. Pygophore with posterolateral angles not developed ( Figs. 4C View FIGURE 4 ; 13A–D View FIGURE 13 ) ........... I. anangulata Rosso & Campos , sp. n.

- Pygophore with posterolateral angles developed ............. 9

9. Posterolateral angles longer than the rest of the pygophore ( Fig. 4A View FIGURE 4 ) ......................................................................... 10

- Posterolateral angles shorter than the rest of the pygophore ( Fig. 4B View FIGURE 4 ) ......................................................................... 15

10. Apex of scutellum broadly rounded, usually emarginated; median region of ventral abdomen not punctured; posterolateral angles of urosternite VII without denticles; head of parameres subparallel to the frontal plane; secondary gonopore circular ( Figs. 34A–B; 34F–M View FIGURE 34 ).......................... ................................ I. marginella Rosso & Campos , sp. n.

- Apex of scutellum narrowly rounded; median region of ventral abdomen slight or moderately punctured; denticles on posterolateral angles of sternite VII present; head of parameres perpendicular or oblique to the frontal plane; secondary gonopore beveled ( Figs. 11J View FIGURE 11 ; 14J View FIGURE 14 ; 16J View FIGURE 16 ; 20J View FIGURE 20 ) ..... ........................................................................................ 11

11. Bucculae slightly higher than the first segment of the labium; setae on the posterodorsal margin of protibiae as long as in the remaining surface; median portion of urosternite VII not reaching anteriorly the imaginary line connecting the spiracles of urosternite V; posterolateral angles of pygophore convergent from the base; head of parameres perpendicular to the frontal plane ................. 12

- Bucculae low, not concealing the first segment of the labium; setae on the posterodorsal margin of protibiae longer than the remaining surface; median portion of urosternite VII reaching anteriorly the imaginary line connecting the spiracles of urosternite V; posterolateral angles of pygophore subparallel; head of parameres oblique to the frontal plane.......................................................... 13

12. Corium slightly shorter than scutellum; posterolateral angles of pygophore about 1.6 times longer than the rest of the pygophore, oblique to the frontal plane at apex; dorsal rim of pygophore sinuous ( Fig. 11A, C–E View FIGURE 11 ) ........................ ................................... I. alalonga Rosso & Campos , sp. n.

- Corium as long as scutellum; posterolateral angles of pygophore about 1.8 times longer than the rest of the pygophore, perpendicular to the frontal plane at apex; dorsal rim of pygophore concave ( Fig. 22A, C–E View FIGURE 22 ) ............ .................................... I. crassula Rosso & Campos , sp. n.

13. Ocelli slightly posterior to the transversal line connecting the inner angles of the eyes; labrum inserted slightly posterior to half of the distance between the anterior margin of the eyes and the apex of the mandibular plates; lateral margins of urosternites with wide blotches ( Fig. 27A–B View FIGURE 27 ).. ..................................... I. guarani Rosso & Campos , sp. n.

- Ocelli on the same line of the inner angles of the eyes; labrum inserted anterior to half of the distance between the anterior margin of the eyes and the apex of the mandibular plates; lateral margins of urosternites with narrow blotches ........................................................................................ 14

14. Corium as long as scutellum; segment X as long as wide; head of parameres flat, narrow at apex ( Fig. 14A, F–I, L– M View FIGURE 14 ) ....................... I. bechyneorum Rosso & Campos , sp. n.

- Corium shorter than scutellum; segment X longer than wide; head of parameres slightly swollen ( Fig. 38A, C, F–I View FIGURE 38 ) ............................. I. paiagua Rosso & Campos , sp. n.

15. Ocelli posterior to the imaginary line connecting the inner angles of the eyes; apex of scutellum widely rounded; corium slightly shorter than scutellum; apical margin of membrane of hemelytra subrectilinear; lateral margins of urosternites with wide blotches; ventral rim of pygophore with 1+1 subtriangular lateral projections ( Fig. 16A–B, C–E View FIGURE 16 )............................. I. confusa Rosso & Campos , sp. n.

- Ocelli on the imaginary line connecting the inner angles of the eyes; apex of scutellum narrowly rounded; corium as long as scutellum; lateral margins of urosternites with narrow blotches; apical margin of membrane of hemelytra convex; ventral rim of pygophore without projections ...... ........................................................................................ 16

16. Bucculae as high as the first labial segment; labrum inserted posterior to the half of the distance between the anterior margin of the eyes and the apex of the mandibular plates; pro- and mesosternum punctured; posterolateral angles of pygophore slightly shorter than the rest of the pygophore; segment X as wide as long, rounded, strongly sclerotized ( Fig. 36B, C–D, L–M View FIGURE 36 )........................................................ ................................... I. montana Rosso & Campos , sp. n.

- Bucculae low, not concealing the first labial segment; labrum inserted anterior to the half of the distance between the anterior margin of the eyes and the apex of the mandibular plates; pro- and mesosternum unpunctured, posterolateral angles of pygophore shorter than half the rest of the pygophore; segment X wider than long, cordiform, membranous mesially..................................................... 17

17. Setae on posterodorsal margin of protibiae as long as the others on the remainder surface; width of the head of parameres more than twice the maximum width of the basal portion; parameres without apical projections or processes, only a small rounded top ( Fig. 46F–I View FIGURE 46 )................................ ..................................... I. vellozia Rosso & Campos , sp. n.

- Setae on posterodorsal margin of protibiae longer than the others ( Fig. 2E, F View FIGURE 2 , rbr); width of the head of parameres less than twice the maximum width of the basal portion; parameres with conspicuous apical process ................... 18

18. Median region of abdomen unpunctured; median portion of urosternite VII reaching anteriorly the imaginary line connecting the spiracles of urosternite V; dorsal rim of pygophore convex, posterolateral angles about 0.5 times the length of the rest of the pygophore; inner and outer margins of the head of parameres convex, apical process wide at apex ( Fig. 20B–I View FIGURE 20 )................................................... ............................... I. cordiformis Rosso & Campos , sp. n.

- Median region of abdomen moderately punctured; median portion of urosternite VII not reaching anteriorly the line connecting the spiracles of urosternite V; dorsal rim of pygophore sinuous, posterodorsal angles about 0.3 times the length of the rest of the pygophore; head of parameres with inner margin sinuous, outer margin strongly convex, minute apical process acute at apex ( Fig. 48B–I View FIGURE 48 )............... ............................. I. wigodzinskyi Rosso & Campos , sp. n.

Key to the females of Ischnopelta Stål, 1868

1. Posteriormost portion of valvifers VIII in a round projection over the middle of laterotergites IX ( Fig. 5O, P View FIGURE 5 ), or forming a 90º angle over laterotergites VIII ( Fig. 5A View FIGURE 5 ) or over laterotergites IX ( Fig. 5B View FIGURE 5 ) ................................................ 2

- Posteriormost portion of valvifers VIII variable, never as above................................................................................. 5

2. Posteriormost portion of valvifers VIII in a round projection over the middle of laterotergites IX ( Fig. 5O, P View FIGURE 5 ).............. 3

- Posteriormost portion of valvifers VIII forming a 90º angle over laterotergites VIII ( Fig. 5A View FIGURE 5 ) or over laterotergites IX ( Fig. 5B View FIGURE 5 ) ........................................................................... 4

3. Coria as long as scutellum, well surpassing the apical angles of urosternite VI; membrane of hemelytra surpassing the posterior margin of the genital plates; median portion of the posterior margin of sternite VII subrectilinear ( Figs. 5O View FIGURE 5 ; 12A–B View FIGURE 12 ) ...................... I. alalonga Rosso & Campos , sp. n.

- Coria slightly shorter than scutellum, not attaining the apical angles of urosternite VI; membrane of hemelytra not reaching the posterior margin of the genital plates; median portion of the posterior margin of urosternite VII slightly concave ( Figs. 5P View FIGURE 5 ; 23A–B View FIGURE 23 )................................................. .................................... I. crassula Rosso & Campos , sp. n.

4. Valvifers VIII as long as wide, lateral portion of the posterior margin subrectilinear, subequal in length to the median portion of the posterior margin ( Figs. 5A View FIGURE 5 ; 10B View FIGURE 10 ).... .............................................. I. scutellata ( Signoret, 1851)

- Valvifers VIII wider than long, lateral portion of the posterior margin concave, median portion narrow, subrectilinear and about 0.3 times the length of the lateral portion ( Figs. 5B View FIGURE 5 ; 15C View FIGURE 15 , vf8)............. I. bechyneorum Rosso & Campos , sp. n.

5. Valvifers VIII with a longitudinal groove delimiting a fold at the distal half of the sutural margin ( Fig. 5C, D View FIGURE 5 ).......... 6

- Valvifers VIII variable, never with a groove nor a fold at the distal half of the sutural margin........................................ 7

6. Average length shorter than 10 mm, bucculae as high as the first labial segment; coria slightly shorter than scutellum; mesosternum unpunctured; foldings on the lateral 1/3 of the posterior margin of urosternite VII laminate ( Figs. 5C View FIGURE 5 ; 17A–C View FIGURE 17 , mpr)................ I. confusa Rosso & Campos , sp. n.

- Length greater than 10 mm, bucculae low, not concealing the first labial segment; coria as long as scutellum; mesosternum punctured; foldings on the lateral 1/3 of posterior margin of urosternite VII thick ( Figs. 5D View FIGURE 5 ; 33A–C View FIGURE 33 , mpr) ............................... I. magna Rosso & Campos , sp. n.

7. Posterior margins of valvifers VIII sinuous, posteriorly projected lateral to the laterotergites IX ( Fig. 5M, N View FIGURE 5 )...... 8

- Posterior margins of valvifers VIII variable, never projected lateral to the laterotergites IX ........................................... 9

8. Posterior projection of valvifers VIII about half of the length of the sutural margin; setae on posterodorsal margin of protibiae as long as the others; foldings on the lateral 1/3 of the posterior margin of urosternite VII hidden beneath the sternite ( Figs. 5M View FIGURE 5 ; 47C View FIGURE 47 , vf8, mpr)................................ ..................................... I. vellozia Rosso & Campos , sp. n.

- Posterior projection of valvifers VIII not greater than 1/3 the length of sutural margin; setae on posterodorsal margin of protibiae longer than the others; foldings on the lateral 1/3 of posterior margin of urosternite VII absent ( Figs. 5N View FIGURE 5 , 49C View FIGURE 49 , vf8).............. I. wigodzinskyi Rosso & Campos , sp. n.

9. Valvifers VIII projected posteriorly over the limits between the laterotergites IX and segment X by more than half the length of laterotergites IX ( Fig. 5Q, R, T View FIGURE 5 )...................... 10

- Valvifers VIII variable, never projected over the limits between the laterotergites IX and segment X ................. 12

10. Posterior margin of valvifers VIII subrectilinear; foldings on the lateral 1/3 of posterior margin of sternite VII well projected over the laterotergites VIII ( Fig. 5T View FIGURE 5 ) .................. ................................ I. marginella Rosso & Campos , sp. n.

- Posterior margin of valvifers VIII sinuous, foldings on the lateral 1/3 of posterior margin of urosternite VII absent or obsolete ( Fig. 5Q, R View FIGURE 5 ) ...................................................... 11

11. Bucculae slightly higher than the first labial segment; labrum inserted anteriorly to half the distance between the anterior margin of the eyes and the apex of mandibular plates; proand mesosternum unpunctured; setae on the posterodorsal margin of protibiae larger than the others; foldings on the lateral 1/3 of the posterior margin of urosternite VII absent ( Fig. 21B View FIGURE 21 ) .............. I. cordiformis Rosso & Campos , sp. n.

- Bucculae low, not concealing the first labial segment; labrum inserted posterior to half the distance between the anterior margin of the eyes and the apex of mandibular plates; proand mesosternum punctured; setae on the posterodorsal margin of protibiae as long as the others; foldings on the lateral 1/3 of posterior margin of sternite VII present ( Fig. 37C View FIGURE 37 , mpr)................... I. montana Rosso & Campos , sp. n.

12. Posterior margin of valvifers VIII broadly convex, with small sinuosities at the lateral and medial limits; scutellum narrowly rounded at apex ( Figs. 5S View FIGURE 5 ; 28A–B View FIGURE 28 )..................... ..................................... I. guarani Rosso & Campos , sp. n.

- Posterior margin of valvifers VIII subrectilinear or slightly sinuous, never broadly convex ( Fig. 5E–L View FIGURE 5 ) ................... 13

13. Posterior margin of valvifers VIII with the lateral part oblique to the longitudinal axis; bucculae slightly higher than the first labial segment; labrum inserted posterior to half the distance between the anterior margin of the eyes and the apex of mandibular plates; pro- and mesosternum punctured; setae on the posterodorsal margin of protibiae longer than the others; median duct of the vesicular area cylindrical proximal to the collar ( Figs. 5E View FIGURE 5 ; 26B, D View FIGURE 26 , mdp) ................................. I. cylindrata Rosso & Campos , sp. n.

- Posterior margin of valvifers VIII without a clearly defined lateral part; bucculae low, not concealing the first labial segment; labrum inserted anterior to half the distance between the anterior margin of the eyes and the apex of mandibular plates; pro- and mesosternum unpunctured; setae on the posterodorsal margin of protibiae as long as the others; median duct of vesicular area dilated proximal to the collar..................................................................... 14

14. Lateral blotches on urosternites wide; membrane of hemelytra surpassing the posterior margin of mediotergite VIII; median portion of urosternite VII with few punctures; denticles on posterolateral angles of urosternite VII present ( Fig. 30A–B View FIGURE 30 ).......... I. impunctata Rosso & Campos , sp. n.

- Lateral blotches on urosternites narrow; membrane of hemelytra not reaching the posterior margin of mediotergite VIII; median portion of urosternite VII moderately to densely punctured; denticles on posterolateral angles of urosternite VII absent ..................................................... 15

15. Foldings on the lateral 1/3 of the posterior margin of urosternite VII thick ( Fig. 32C View FIGURE 32 , mpr) ................................. ............................................... I. luteicornis ( Walker, 1867)

- Foldings on the lateral 1/3 of the posterior margin of urosternite VII laminate.................................................. 16

16. Length of the mandibular plates anterior to the clypeus equal to or longer than the length between the base of the head and the apex of clypeus; evaporatorium reaching the lateral margin of mesopleura; lateral margin of laterotergites IX subrectilinear ............................................................. 17

- Length of the mandibular plates anterior to the clypeus shorter than the length between the base of the head and the apex of clypeus; evaporatorium not reaching the lateral margin of mesopleura; lateral margin of laterotergites IX convex............................................................................. 19

17. Posterior margin of valvifers VIII subrectilinear, laterotergites IX not attaining the posterior margin of mediotergite VIII ( Figs. 5H View FIGURE 5 ; 25C View FIGURE 25 ); inner duct of vesicular area convoluted within the dilation of the median duct distal to the collar ( Fig. 25D View FIGURE 25 ) ....................................................... .................................. I. cristulata Rosso & Campos , sp. n.

- Posterior margin of valvifers VIII sinuous ( Figs. 5J View FIGURE 5 , 45C View FIGURE 45 ), if the margin is subrectilinear the laterotergites IX attain the posterior margin of mediotergite VIII ( Figs. 5I View FIGURE 5 , 19C View FIGURE 19 ); inner duct of vesicular area rectilinear..................................... 18

18. Median portion of the posterior margin of urosternite VII subrectilinear; laterotergites IX reaching the posterior margin of mediotergite VIII; lateral margin of valvifers IX subrectilinear; median duct of vesicular area not widened distally ( Fig. 19B. D View FIGURE 19 , vf9, md) ........................................... .................................. I. coralinae Rosso & Campos , sp. n.

- Median portion of the posterior margin of urosternite VII concave; laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin of valvifers IX convex; median duct of vesicular area subtly widened distally ( Fig. 45B, D View FIGURE 45 , vf9, md)........... I. ruckesi Rosso & Campos , sp. n.

19. Lateral blotches of urosternites long and narrow; laterotergites IX reaching the posterior margin of mediotergite VIII ( Fig. 42B and D View FIGURE 42 ).................................... ............................... I. pellucidula Rosso & Campos , sp. n.

- Lateral blotches of urosternites minute; laterotergites IX almost reaching the posterior margin of mediotergite VIII ( Fig. 40B–C View FIGURE 40 )................ I. parvula Rosso & Campos , sp. n.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Pentatomidae

Loc

Ischnopelta Stål, 1868

Rosso, Pedro & Campos, Luiz Alexandre 2021
2021
Loc

Ischnopelta: Berg, 1891: 238

Grazia, J. & Panizzi, A. R. & Greve, C. & Schwertner, C. F. & Campos, L. A. & Garbelotto, T. A. & Fernandes, J. A. M. 2015: 712
Rolston, L. H. 1990: 15
Kirkaldy, G. W. 1909: 215
Berg, C. 1891: 238
1891
Loc

Discocephala (Ischnopelta) Stål, 1868: 18

Lethierry, L. & Severin, G. 1893: 83
Stal, C. 1872: 6
Stal, C. 1868: 18
1868