Ischnopelta parvula 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 : 164-167

Ischnopelta parvula Rosso & Campos , sp. n. ( Figs. 5L , 39–40 )

Etymology. The epithet refers to the small size of the two lateral brown spots on each abdominal segment. Latin: parvulus (dim.) = small, minute.

Type Locality. BRAZIL, Bahia, Itabuna [-4.7865, - 39.2728] .

Holotype. Male. BRAZIL, Bahia, Itabuna, G. Bondar. Deposited at Museu de Zoologia da Universidade de São Paulo ( MZSP), São Paulo ( SP), Brazil.

Paratypes. 1 male and 2 females. BRAZIL, Paraíba, Areias , 1 male, IV .1933, [-6.9691, -35.7015], ( MNRJ); Bahia, Itabuna , 2 females, G . Bondar, [-4.7865, -39.2728], ( MNRJ) .

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 apex of mandibular plates. Antennae dark yellowish with rare and 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 the radial vein. Pro-, meso-and metasternum dark yellowish. Pro-, meso- and metapleura dark yellowish, densely punctured on the laterals. Evaporatorium not reaching the lateral margin of mesopleura. Setae on posterodorsal margin of protibiae as long as the others.

Abdomen. Dark spots at the lateral of urosternites minute; urosternite VII unarmed.

Male. Apical margin of membrane of hemelytra subrectilinear. 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 region more sclerotized ( Fig. 39C , dr); ventral rim subrectilinear with wide and shallow median depression ( Fig. 39D , vr). Posterolateral angles 1.5 times longer than the rest of the pygophore, base perpendicular and apex oblique to the frontal plane, convergent from the base ( Fig. 39C–E , pla). Setae short and sparse on posterior half of ventral and lateral surfaces of the pygophore, and on outer surface of the posterolateral angles; 1 + 1 tufts of long setae lateral to the median depression of ventral rim. Segment X as wide as long, reaching the apex of posterolateral angles and surpassing the apex of parameres; rounded; basal area and apical margin membranous; disc sclerotized and covered by setae ( Fig. 39C–E, X ). Parameres falciform, flat, shorter than posterolateral angles; subparallel to the frontal plane; apical portion of outer margin strongly convex; inner margin sinuous, distal portion strongly excavated and with an apical process, aculeiform, convergent, and ventrolaterally directed; apical margin convex; ventral surface with oblique crest ( Fig. 39D , vcp) and setae posterior to the crest ( Fig. 39D–E , pa). Cup-like sclerites externally visible, with apices convergent ( Fig. 39D , cls). Internal genitalia not examined.

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, and projections of urosternite VII as described for I. scutellata ( Fig. 40C , mpr). Genitalia. Valvifers VIII wider than long; posterior margin slightly sinuous, 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 median portion of posterior margin ( Figs. 5L ; 40C , vf8). Valvifers IX with apices externally visible, lateral margin convex, setae on mid-basal portion of ventral surface ( Fig. 40C–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. 40C–D , la9). Thickening of vaginal intima cordiform, wider than long; distal margin concave and more sclerotized; lateral margins convex; mid-basal subquadrangular area membranous ( Fig. 40D , vi). Vesicular area anterior to the collar 1/10 the posterior portion; median duct anterior to the collar with slight proximal widening ( Fig. 40D , md); inner duct not coiled ( Fig. 40D , id). Distal ductus receptaculi of same caliber as the proximal one ( Fig. 40D , drd, drp). Pars intermedialis cylindrical ( Fig. 40D , pi); proximal annular crest perpendicular to the pars intermedialis, distal annular crest directed to the pars intermedialis and twice the size of the proximal ( Fig. 40D , dac, pac). Capsula seminalis globose, with two lateral filiform projections directed to the pars intermedialis, one long surpassing the proximal annular crest and the other reaching the distal annular crest ( Fig. 40D , cs, pr).

Measurements: Table 18.

Distribution. Brazil (Paraíba, Bahia) ( Fig. 8 ).

Comments. See comments in I. coralinae sp. n.. Ischnopelta parvula sp. n. presents minute spots on the laterals of the urosternites ( Figs. 39B ; 40B ), the smallest among all the species in the genus.

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 39. Ischnopelta parvula Rosso & Campos, sp. n. Holotype male. A, dorsal view; B, ventral view; C–E, pygophore: dorsal, ventral, and posterior views, respectively. Abbreviations: cls, cup like sclerites; dr, dorsal rim; pa, parameter; pla, posterolateral angle; vcp, ventral crest; vr, ventral rim; X, segment X.

FIGURE 40. Ischnopelta parvula 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.