Ischnopelta crassula Rosso & Campos, sp. n.
Creators: name: Rosso, Pedro
name: Campos, Luiz Alexandre
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Pentatomidae
Ischnopelta
Ischnopelta crassula

description: 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).
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.
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 ..
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 131-135, DOI: 10.11646/megataxa.6.2.3, http://zenodo.org/record/5752808