Ischnopelta cordiformis 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 cordiformis

description: Ischnopelta cordiformis Rosso & Campos, sp. n. (Figs. 5Q, 20–21)
Etymology. The epithet refers to the shape of the male segment X. Latin: cordis = heart + formis = form, shape.
Type locality. BRAZIL, Mato Grosso, Santa Terezinha [-10.646111, -50.613056].
Holotype. Male. BRAZIL, Mato Grosso, Santa Terezinha (mouth of Rio Tapirapé), 26.XII.1962, B. Malkin. Deposited at Museu Paraense Emilio Goeldi (MPEG), Belém (PA), Brazil.
Paratypess. 1 male and 2 females. BRAZIL, Mato Grosso, Santa Terezinha (mouth of Rio Tapirapé), 1 female, 1.X.1963,[-10.646111, -50.613056],(CAS); Santa Terezinha (Porto Velho), 1 female, 15.XI–15.XII.1962, R. Pinheiros, [-10.7728, -51.0056], (DZUP); São Félix do Araguaia, 1 male, VI.1961, M. Alvarenga, [-11.6169, -50.6689], (CAS).
Description. The overall somatic morphology is as described for I. scutellata, except for the following features. Male and female respectively 2 and 2.1 times longer than wide. Head. Labium reaching the metacoxae. Labrum inserted anterior to half the distance between the anterior margin of the eyes and the apex of mandibular plates. Antennae segments I to III dark yellowish with brown blotches and punctures, segments IV and V brown; segments ratio: I>II<III<IV<V.
Thorax. Hemelytra: corium as long as scutellum; conspicuous spot at apex of radial vein.
Male. Apical margin of membrane of hemelytra convex; median portion of posterior margin of urosternite VII subrectilinear; urosternite VII reaching anteriorly the imaginary line connecting the spiracles of sternite V. Genitalia. Pygophore with dorsal rim concave (Fig. 20C, dr) and ventral rim slightly concave (Fig. 20D, vr). Posterolateral angles 0.5 times shorter than the rest of the pygophore, perpendicular to the frontal plane and divergent from the base (Fig. 20C–E, pla). Setae short and sparse on posterior half of ventral and lateral surfaces of pygophore; setae long and dense on ventral rim and on ventral and apical margins of posterolateral angles. Segment X wider than long, surpassing the apex of posterolateral angles, but not the parameres; cordiform; apical margin sclerotized and emarginated; lateral margins sclerotized and covered by long setae, mid-longitudinal region membranous and with short and sparse setae (Figs. 20C and E, X; 20L–M). Parameres claviform, head wide, oblique to the frontal plane; outer margin sinuous, slightly concave on proximal half and strongly convex on distal half; inner margin sinuous, distal portion strongly sclerotized, sinuous; apical process convergent; setae covering the ventral distal half of the head, and the sclerotized area (Figs. 20D, pa; 20F– I). Cup-like sclerites externally visible, apices rounded and subparalel. Phallus: proximal half of vesica broader laterally, dorsally flattened and ventrally expanded; distal half sinuous; secondary gonopore ventral and beveled (Fig. 20J–K).
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.
Female. Membrane of hemelytra not reaching the posterior margin of mediotergite VIII, posterior margin convex; median portion of posterior margin of both mediotergite VIII and urosternite VII subrectilinear; projections on the lateral 1/3 of posterior margin of sternite VII undeveloped (Fig. 21C). Genitalia. Valvifers VIII wider than long; posterior margin sinuous, moderately oblique to the median line, portion on the sutural margins narrow and acutely rounded, lateral portion slightly concave; sutural margins subrectilinear and folded dorsally; surface convex, dark yellowish with brown punctures and setae on sutural margins and sutural angles (Figs. 5Q; 21C, vf8). Valvifers IX almost completely covered by valvifers VIII; lateral margin subrectilinear; setae on mid-basal portion of ventral surface (Fig. 21C–D, vf9). Laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin sinuous; setae on median portion of lateral margin and mid-basal portion of ventral surface (Fig. 21C–D, la9). Thickening of vaginal intima subcircular, slightly wider than long; distal portion more sclerotized; apical margin slightly concave, ventral cone membranous, oval (Fig. 21D, vi). Vesicular area: anterior portion to the collar 1/8 of the posterior portion; median duct anterior to the collar with slight proximal widening (Fig. 21D, mdp); median duct posterior to the collar with both proximal and distal widening (Fig. 21D, md); inner duct coiled in the proximal widening of the median duct (Fig. 21D, id). Pars intermedialis and capsula seminalis not examined.
Measurements: Table 7.
Distribution. Brazil (Mato Grosso) (Fig. 7).
Comments. Although the posterior margin of valvifers VIII of Ischnopelta cordiformis sp. n. is similar to I. montana sp. n., in I. cordiformis the sutural portion is more angular and the median portion is subrectilinear (Figs. 5Q; 21C, vf8), while in I. montana the sutural portion is strongly convex, and the lateral portion is concave (Figs. 5R; 37C, vf8). Besides that, the lateral abdominal margins in I. montana are delineate by an unpunctured narrow band where two subtriangular darkbrown spots are observed on the laterals of the urosternites (Fig, 37B), while in I. cordiformis the punctures extend close to the abdominal margins, leaving only small unpunctured areas, and the lateral spots are narrower and irregular, sometimes elongated (Fig, 21B). Lastly, females of I. cordiformis do not present sclerotized rims on the lateral 1/3 of posterior margin of urosternite VII. The undeveloped posterolateral angles, and the cordiform segment X with broad membranous area in I. cordiformis (Figs. 20C–D, pla; 20L–M) allows to easily distinguish it from I. montana, whose posterolateral angles are more developed and subtriangular, and the segment X is rounded and strongly sclerotized (Figs. 36C–D, pla; 36L–M).
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 128-131, DOI: 10.11646/megataxa.6.2.3, http://zenodo.org/record/5752808