Ischnopelta crassula 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 : 131-135

Ischnopelta crassula Rosso & Campos , sp. n. ( Figs. 5P , 22–23 )

Etymology. Epithet proposed by Dr. H. Ruckes as registered in the manuscripts found with the specimens used in the study.He considered that this species has thicker and more irregular punctures, from which the epithet is inferred. Latin crassus = thick + ula = diminutive.

Type locality. PARAGUAY, C entral, San Bernardino [-25.2667, -57.3167] .

Holotype. Male. PARAGUAY, C entral, San Bernardino (2 km S. San Bernardino), 6.II.1968, L. & C. W. O’Brien. Deposited at the National Museum of Natural History ( USNM), Washington D.C., USA.

Paratypes. 7 males and 13 females. BRAZIL, Mato Grosso do Sul, Corumbá , 1 male and 1 female, 16.X.1956, C. R. Gonçalves, [-19.0167, -57.65], ( MNRJ, Coleção Campos Seabra ); PARAGUAY, Concepcion, Vallemi , 1 male and 2 females, 4. II.1976, Delloach, [-22.1333, - 57.9667], ( USNM); Central , Asunción, 2 males and 3 females, B. Podtiaguin. [-25.2939, -57.6111], ( AMNH); San Bernardino , 2 females, 14. I.1939, Dernier Coll., [- 25.2667, -57.3167], ( MLPA); 1 male and 1 female, Fiebrig, [-25.2667, -57.3167], ( UFRG); San Bernadino ( Ypacaraí lake ), 1 female, 11.X.1968, L. & C. W. O’Brien, [-25.2667, -57.3167], ( J. E. Eger, Private Collection ); Areguá , 1 male and 1 female, 7. V.2006, C. Aguilar, [-25.3125, -57.3847], ( J. E. Eger, Private Collection ); Lambaré , 1 female, 9.X.1989, G. Arriagada , [-25.3125, -57.3847], ( J. E. Eger, Private Collection); ARGENTINA, Misiones , 1 male and 1 female, [-27.3671, -55.8961], ( MLPA) .

Description. The overall somatic morphology is as described for I. scutellata , except for the following features.Head.Labruminsertedanteriortohalfthedistance between the anterior margin of the eyes and the apex of mandibular plates. Antennae dark yellowish, segment III brownish; antennal segment ratio: I>II<III<IV<V.

Thorax. Scutellum reaching the apical angles of urosternite VI. Hemelytra: conspicuous spot at apex of radial vein. Evaporatorium not reaching the lateral margin of mesopleura. Setae on posterodorsal margin of protibiae as long as the others.

Abdomen. Some specimens present extensive reddish blotches on the median region of urosternites.

Male. Apical margin of membrane of hemelytra convex. Median portion of posterior margin of urosternite VII subrectilinear; urosternite VII not reaching anteriorly the imaginary line connecting the spiracles of sternite V. Genitalia. Pygophore with dorsal and ventral rim concave ( Figs. 22C , dr; 22D, vr). Posterolateral angles 1.8 times longer than the rest of the pygophore, perpendicular to the frontal plane and convergent from the base, dorsal margin folded to the interior of pygophore ( Fig. 22C–E , pla). Setae short and sparse on posterior half of ventral and lateral surface of the pygophore, and on outer surface of posterolateral angles; setae long on ventral rim, and apex and ventral margin of posterolateral angles. Segment X longer than wide, surpassing the apex of parameres, but not reaching the apex of posterolateral angles; subrectangular, and strongly emarginated apically; lateral margins sclerotized and covered by long setae; midlongitudinal area membranous and with short and sparse setae ( Figs. 22C; 22L–M, X ). Parameres claviform, perpendicular to the frontal plane; outer and inner surfaces sinuous, distal portion of inner surface slightly concave, with differentiated texture formed by transversal lines; acute and convergent apical process; ventral surface sinuous; dorsal surface narrow, distal half strongly convex distally; setae covering apical portions of ventral and outer surfaces, and posterior margin ( Fig. 22F–I ). Cup-like sclerites visible externally and with rounded and subparallel apices ( Fig. 22D , cls). Phallus: proximal half of vesica as wide as distal margin of phallotheca, dorsally flat and ventrally convex, gradually narrowing until curving ventrally; distal half sinuous and curved ventrally; secondary gonopore beveled ( Fig. 22J–K ).

Female. Hemelytral membrane not reaching the posterior margin of mediotergite VIII, posterior margin convex; median portion of posterior margin of mediotergite VIII subrectilinear; median portion of posterior margin of urosternite VII concave; projections of urosternite VII ( Fig. 23C , mpr) as described for I. scutellata . Genitalia. Valvifers VIII wider than long; posterior margin strongly sinuous, sutural margin slightly convex and oblique in relation to the median line, lateral portion sinuous, partially subparallel to the sutural rim; sutural margins subrectilinear and dorsally folded; surface dark yellowish with brown punctures; setae on sutural margins and on median half of posterior margin; longitudinal grooves narrow and shallow ( Figs. 5P ; 23C , vf8). Valvifers IX covered by valvifers VIII; lateral margin subrectilinear; setae on mid-basal portion of ventral surface ( Fig. 23D , vf9). Laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin convex; setae on median portion of lateral margin and mid-basal portion of ventral surface ( Fig. 23C–D , la9). Thickening of vaginal intima subcircular, wider than long; proximal margin sinuous and wider than the distal one, distal margin weakly emarginated; median area with small membranous subtriangular cone, and sinuous longitudinal ventral crests ( Fig. 23D , vi). Vesicular area: anterior portion to the collar with slight proximal widening ( Fig. 23D , mdp), median duct posterior to the collar with proximal and distal widening ( Fig. 23D , md), inner duct coiled in the proximal widening ( Fig.23D , id).Distal ductus receptaculi 0.5 the length of the vesicular area posterior to the collar ( Fig. 23D , drd, drp). Pars intermedialis broader distally ( Fig. 23D , pi); annular crests perpendicular to the pars intermedialis, the proximal slightly smaller than the distal one ( Fig. 23D , dac, pac). Capsula seminalis globose, with a long and sinuous laterobasal filiform projection directed to the pars intermedialis, and a minute lateral projection ( Fig. 23D , cs, pr).

Measurements: Table 8.

Distribution. Brazil (Mato Grosso do Sul), Paraguay (Concepcion, Central, Itapuá), Argentina (Misiones) ( Fig. 7 ).

Comments. See observations in I. alalonga sp.n..

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 7. Distribution of Ischnopelta cordiformis Rosso & Campos, sp. n.; Ischnopelta crassula Rosso & Campos, sp. n.; Ischnopelta cristulata Rosso & Campos, sp. n.; Ischnopelta guarani Rosso & Campos, sp. n.; Ischnopelta impunctata Rosso & Campos, sp. n.; Ischnopelta luteicornis (Walker, 1867); Ischnopelta magna Rosso & Campos, sp. n..

FIGURE 22. Ischnopelta crassula 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; pa, parameter; ph, phalloteca; pla, posterolateral angle; vr, ventral rim; vs, vesica; X, segment X.

FIGURE 23. Ischnopelta crassula 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.