Ischnopelta Stal 1868
Creators: name: Rosso, Pedro
name: Campos, Luiz Alexandre
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Pentatomidae
Ischnopelta

description: 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), 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 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, int) and with setae on the posterodorsal margin (Fig. 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). 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). Posterolateral angles not projected in some species (e.g., Fig. 4B, C); when projected the posterolateral angles are laterally compressed (e.g., Fig. 4A), 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; 11C), and exceeding posteriorly the ventral rim by at least half the length of the segment X (e.g., Figs. 9D; 11D). 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, 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).
Female. Median portion of the posterior margin of urosternite VI concave (e.g., Fig.10B).Genitalia.Valvifers VIII dorsoventrally flattened, usually covering the valvifers IX and at least the base of laterotergites IX (Fig. 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). 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). Ductus receptaculi: outer duct of vesicular area folded over itself on the proximal portion, forming a collar (Fig. 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; 7; 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).......................... .............................................. 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; 24C–M; 29C–M; 31C–M; 39C–E; 43A–K; 44C– M) ..................................................................................... 2
- Other combinations for the characteristics of the pygophore posterolateral angles, and for the shape of the parameres and segment X (Fig. 4A–C).............................................. 8
2. Membrane of hemelytra with apical margin subrectilinear (Figs. 29A–B; 39A–B) ..................................................... 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, dt)........................... I. impunctata Rosso & Campos, sp. n.
- Minute blotches on lateral of urosternites; denticles on posterolateral angles of urosternite VII absent (Fig. 39A– B) ................................. 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; 43B and E, 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, vcp) .................. I. cristulata Rosso & Campos, sp. n.
- Ventral surface of parameres with an oblique crest (Fig. 31G, vcp) .......................................................................... 6
6. Median portion of urosternite VII reaching anteriorly the imaginary transversal line connecting the spiracles of urosternite V (Fig. 31B)......... 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, 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, amp) ........ I. ruckesi Rosso & Campos, sp. n.
8. Pygophore with posterolateral angles not developed (Figs. 4C; 13A–D) ........... I. anangulata Rosso & Campos, sp. n.
- Pygophore with posterolateral angles developed ............. 9
9. Posterolateral angles longer than the rest of the pygophore (Fig. 4A) ......................................................................... 10
- Posterolateral angles shorter than the rest of the pygophore (Fig. 4B) ......................................................................... 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).......................... ................................ 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; 14J; 16J; 20J) ..... ........................................................................................ 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) ........................ ................................... 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) ............ .................................... 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).. ..................................... 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) ....................... 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) ............................. 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)............................. 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)........................................................ ................................... 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)................................ ..................................... I. vellozia Rosso & Campos, sp. n.
- Setae on posterodorsal margin of protibiae longer than the others (Fig. 2E, F, 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)................................................... ............................... 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)............... ............................. 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), or forming a 90º angle over laterotergites VIII (Fig. 5A) or over laterotergites IX (Fig. 5B) ................................................ 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).............. 3
- Posteriormost portion of valvifers VIII forming a 90º angle over laterotergites VIII (Fig. 5A) or over laterotergites IX (Fig. 5B) ........................................................................... 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; 12A–B) ...................... 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; 23A–B)................................................. .................................... 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; 10B).... .............................................. 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; 15C, 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).......... 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; 17A–C, 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; 33A–C, mpr) ............................... I. magna Rosso & Campos, sp. n.
7. Posterior margins of valvifers VIII sinuous, posteriorly projected lateral to the laterotergites IX (Fig. 5M, N)...... 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; 47C, 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, 49C, 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)...................... 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) .................. ................................ 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) ...................................................... 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) .............. 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, 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; 28A–B)..................... ..................................... I. guarani Rosso & Campos, sp. n.
- Posterior margin of valvifers VIII subrectilinear or slightly sinuous, never broadly convex (Fig. 5E–L) ................... 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; 26B, D, 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).......... 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, 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; 25C); inner duct of vesicular area convoluted within the dilation of the median duct distal to the collar (Fig. 25D) ....................................................... .................................. I. cristulata Rosso & Campos, sp. n.
- Posterior margin of valvifers VIII sinuous (Figs. 5J, 45C), if the margin is subrectilinear the laterotergites IX attain the posterior margin of mediotergite VIII (Figs. 5I, 19C); 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, 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, 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).................................... ............................... I. pellucidula Rosso & Campos, sp. n.
- Lateral blotches of urosternites minute; laterotergites IX almost reaching the posterior margin of mediotergite VIII (Fig. 40B–C)................ I. parvula Rosso & Campos, sp. n.
description: Published as part of Rosso, Pedro & Campos, Luiz Alexandre, 2021, Revision of Ischnopelta Stål, 1868 with the description of twenty new species (Hemiptera: Pentatomidae: Discocephalinae), pp. 96-184 in Megataxa 6 (2) on pages 98-104, DOI: 10.11646/megataxa.6.2.3, http://zenodo.org/record/5752808