Revision of Ischnopelta Stål, 1868 with the description of twenty new species (Hemiptera: Pentatomidae: Discocephalinae) Author Rosso, Pedro Author Campos, Luiz Alexandre text Megataxa 2021 2021-11-18 6 2 96 184 journal article 3114 10.11646/megataxa.6.2.3 80116c4c-868f-4c71-b68f-66c4489d1375 2703-3090 5752808 Ischnopelta impunctata Rosso & Campos , sp. n. ( Figs. 5F , 29–30 ) Etymology . The epithet refers to the absence of punctures in large areas of the median region of the abdomen. Latin: im- = not, without + punctum = small point, punctures. Type Locality. BRAZIL , Piauí , Piripiri [ -4.0989 , - 41.0981 ] . Holotype . Male. BRAZIL , Piauí , Piripiri (Parque Nacional Sete Cidades), 31.I.2007 , I.S. Carvalho. Deposited at the collection of Universidade Federal of Pará ( UFPA ), Belém (PA), Brazil. Paratypes . 9 males and 9 females . BRAZIL , Maranhão , SãoLuiz , 1female , 13. III .1984,A.BrisolaCol., [-2.5325. -44.2963], (UNIFESP); 1 female , 22. V .1984, A. Brisola Col., [-2.5325. -44.2963], (UNIFESP); 1 male and 2 females , 08.VII.1987 , A. Brisola Col. , [-2.5325. - 44.2963], (UNIFESP); Piauí , Piripiri ( Parque Nacional Sete Cidades ) , 1 male , 12.XII.2006 , I.S. Carvalho , [ - 4.1256 , -41.7093 ], ( UFPA ) ; 5 males and 2 females , 31.I.2007 , I.S. Carvalho , [ -4.0989 , -41.0981 ], ( UFPA ) ; 1 female , 23. VI .2007, I.S. Carvalho , [ -4.0989 , -41.0981 ], ( UFPA ); Maranhão , Mirador ( Parque Estadual Mirador , Posto Avançado do Mel ) , 1 female , 18–25. III .2012, F. Limeira de Oliveira & D. W. A. Marques , [ -6.730556 , -44.983056 ], ( CZMA / UEMA ); Paraíba , Juazeirinho , 1 male and 1 female , 26. VI .1956, A. G. A. Silva , [ - 6.730556 , -44.983056 ], ( MCNZ , Coleção Campos Seabra ); Piauí , Uruçuí ( Estrada Estadual de Uruçuí ) , 1 male , 2–26. V .1984, R . Gonçalves , [ -7.2316 , -44.5564 ], ( DZUP ) . Description . The overall somatic morphology is as described for I. scutellata , except for the following features. Head. Labrum inserted anteriorly to half the distance between the anterior margin of the eyes and the apex of mandibular plates. Antennae dark yellowish, slightly brown ventrally; segments ratio: I=II<III<IV<V. Thorax. Hemelytra: corium as long as scutellum, conspicuous spot at apex of the radial vein. Pro-, meso-and metapleura dark yellowish, densely punctured on the laterals. Setae on posterodorsal margin of protibiae as long as the others. Abdomen. Urosternites with the anterior lateral blotch slightly longer than the posterior one, both wide; median region of urosternites weakly punctured. Male . Apical margin of membrane of hemelytra subrectilinear. Median portion of posterior margin of urosterniteVII concave; urosternite VII not reaching anteriorly the imaginary line connecting the spiracles of urosterniteV. Genitalia .Pygophorewithdorsalrimconcave ( Fig. 29C , dr), ventral rim subrectilinear with a slight median depression extending to the ventral surface of the pygophore ( Fig. 29C , vr). Posterolateral angles 1.6 times longer than the rest of the pygophore, base perpendicular and apex oblique to the frontal plane, convergent from the base ( Fig. 29C–E , pla). Setae short and sparse on posterior half of ventral and lateral surfaces of the genital capsule and on the outer surface of the posterolateral angles; setae long on ventral rim and on ventral and apical margins of posterolateral angles. Segment X slightly longer than wide, oval, reaching the apex of posterolateral angles and surpassing the apex of parameres; proximal portion and apical margin membranous; lateral margins strongly convex; surface sclerotized and covered with setae, with 1 + 1 lateroproximal tufts ( Figs. 29C and E, X; 29L–M ). Parameres falciform, flat, shorter than the posterolateral angles, subparallel to the frontal plane; basal portion of outer margin convex, apical portion strongly convex; inner margin sinuous, distal portion strongly excavated and with an apical aculeiform process, convergent and ventrolaterally directed; apical margin convex; ventral surface with an oblique crest ( Fig. 47B and E , vcp); setae covering the crest and the posterior region ( Figs. 29D , pa; 29F–I). Cup-like sclerites externally visible and with convergent apices ( Fig. 29D , cls). Phallus: proximal 2/3 of vesica directed ventroposteriorly, base as wide as apical margin of the phallotheca and gradually narrowing, with a ventral subtriangular expansion; distal portion directed ventrally; secondary gonopore ventral and beveled ( Fig. 29J–K ). Female . Membrane of hemelytra surpassing the posterior margin of mediotergite VIII, posterior margin convex; posterior margin of mediotergite VIII and of urosternite VII, and projections of urosternite VII laminate as described for I. scutellata ( Fig. 30C , mpr). Genitalia . Valvifers VIII wider than long; posterior margin slightly sinuous, weakly folded dorsally, with small projection on the lateral angle; 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; longitudinal grooves narrow and shallow on basal portion ( Figs. 5F ; 30C , vf8). Apices of valvifers IX externally visible; lateral margin convex; setae on mid-basal portion of ventral surface ( Fig. 30C–D , vf9). Laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin convex; setae on mid-basal portion of lateral margin and ventral surface ( Fig. 30C–D , la9). Thickening of vaginal intima hexagonal, slightly wider than long; distal portion more sclerotized; mid-basal subquadrangular area membranous ( Fig. 30D , vi). Vesicular area anterior to the collar 1/10 of the posterior portion; median duct with slight proximal widening both anterior and posterior to the collar ( Fig. 30D , md, mdp); inner duct not coiled ( Fig. 30D , id). Distal ductus receptaculi of same caliber as the proximal one ( Fig. 30D , drd, drp). Pars intermedialis uniformelly wide ( Fig. 30D , pi); proximal annular crest perpendicular to the pars intermedialis, the distal one directed to the pars intermedialis and twice the diameter of the proximal crest ( Fig. 30D , dac, pac). Capsula seminalis globose and with a laterobasal projection filiform directed to the pars intermedialis ( Fig. 30D , cs, pr). Measurements: Table 12 . FIGURE 29. Ischnopelta impunctata 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: cls, cup like sclerites; dr, dorsal rim; dt, denticles; pa, parameter; ph, phalloteca; pla, posterolateral angle; vcp, ventral crest; vr, ventral rim; vs, vesica; X, segment X. FIGURE 30. Ischnopelta impunctata Rosso & Campos , sp. n. 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. TABLE 12. Measurements (mean, standard deviation, minimum and maximum) and number of Ischnopelta impunctata Rosso & Campos , sp. n. specimens evaluated (n).

Body structure	Measurements performed	n	Male Measurements (mm)	n	Female Measurements (mm)
Body	tl mw	6	7.02±0.45; (6.51–7.77) 3.89±0.36; (3.55–4.51)	7	8.02±0.24; (7.77–8.51) 4.37±0.31; (3.85–4.78)
hl	1.53±0.10; (1.44–1.71)	1.63±0.09; (1.55–1.76)
cl	0.53±0.04; (0.47–0.58)	0.58±0.03; (0.54–0.61)
Head	hw	6	3.07±0.28; (2.74–3.56)	8	3.32±0.14; (3.13–3.51)
iod	0.84±0.05; (0.79–0.92)	0.91±0.05; (0.86–1.01)
ied	2.45±0.22; (2.23–2.86)	2.65±0.14; (2.41–2.81)
pl	1.55±0.10; (1.41–1.70)	1.70±0.10; (1.63–1.88)
Pronotum	haw	6	3.58±0.31; (3.33–4.14)	8	3.90±0.23; (3.63–4.22)
aaw	3.08±0.28; (2.74–3.55)	3.25±0.18; (3.03–3.55)
sl	3.84±0.39; (3.48–4.51)	4.41±0.29; (4.00–4.96)
fll	1.67±0.18; (1.48–2.00)	1.85±0.10; (1.70–2.03)
Scutellum	pfl	6	2.17±0.23; (1.85–2.52)	8	2.47±0.11; (2.29–2.66)
bsw	2.34±0.20; (2.07–2.66)	2.64±0.16; (2.49–2.96)
fcw	1.55±0.18; (1.33–1.85)	1.71±0.11; (1.63–1.89)
I II	5	0.40±0.04; (0.36–0.47) 0.37±0.03; (0.36–0.43)	8	0.42±0.02; (0.40–0.43) 0.43±0.02; (0.40–0.47)
Antennae	III IV	4	0.72±0.05; (0.68–0.79) 0.81±0.05; (0.76–86)	7	0.74±0.03; (0.68–0.76) 0.86±0.04; (0.83–0.90)
V	2	1.01±0.05; (0.97–1.04)	6	1.05±0.03; (1.02–1.08)
I	0.61±0.07; (0.54–0.68)	0.61±0.02; (0.58–0.65)
Labium	II III	6	1.36±0.12; (1.26–1.51) 0.57±0.04; (0.50–0.61)	8	1.32±0.05; (1.22–1.40) 0.55±0.05; (0.47–0.61)
IV	0.38±0.02; (0.36–0.40)	0.38±0.02; (0.36–0.40)

Legend : tl, total length; mw, maximum width (at the sternite III level); hl, head length; cl, clypeus length; hw, head width; iod, interocellar distance; ied, interocular distance; pl, pronotum length; haw, pronotum width at the level of humeral angles; aaw, pronotum width at the level of anterolateral angles; sl, scutellum length; fll, frenal lobe length; pfl, post-frenal lobe length; bsw, basal scutellum width; fcw; scutellum width at the level of frenal constriction; I, II, III, IV and V, antennal and labium segments length. Distribution . Brazil ( Maranhão , Piauí , Ceará , Paraíba ) ( Fig 7 ). Comments . Among the species grouped with I. coralinae sp. n. (see comments for the latter), Ischnopelta impunctata sp. n. is the only one having wide blotches on the laterals of the urosternites, and armed urosternite VII ( Figs. 29B , dt; 30B). In relation to the females of the group, I. impunctata sp. n. differs by the membrane of hemelytra surpassing the posterior margin of mediotergite VIII, and the median abdominal region weakly punctured ( Fig. 30A– B ). Among males, I. impunctata sp. n. and I. parvula sp. n. are the only species with subrectilinear margin of the hemelytral membrane ( Figs. 29A–B ; 39A–B ).