Ischnopelta pellucidula 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 : 167-172

Ischnopelta pellucidula Rosso & Campos , sp. n. ( Figs. 3 , 5K , 41–43 )

Etymology. Epithet proposed by Dr. H. Ruckes as registered in the manuscripts found with the specimens used in the study. He considered this species to have a semi-translucent aspect, from which the epithet is inferred. Latin: pellucidus = transparent + ula = diminutive.

Type Locality. BRAZIL, Roraima, Normandia [3.76952, -59.67135] .

Holotype. Male. BRAZIL, Roraima, Normandia (Rio Ireng/Maú), 16.VIII.1911. Deposited at Museu Paraense Emilio Goeldi ( MPEG), Belém ( PA), Brazil .

Paratypes. 10 males and 13 females. VENEZUELA, Bolívar, Ciudad Bolívar (35 km SWP for Ruta 2), 1 female, 13.VII–2.VIII.1987, S. & J . Peck, [8.122222, - 63.549722], ( AMNH); San Francisco , 8 males and 7 females, 22–26.X.1966, J. & B . Bechyné & E . Osuna, [7.0667, -63.6], ( MIZA); Chirima , 1 female, 12.X.1966, J. & B . Bechyné & E . Osuna , [5.05, -60.95], ( MIZA) ; BRAZIL, Roraima, Normandia (Rio Ireng / Maú ), 2 males and 4 females, 16.VIII.1911, [3.76952, -59.67135], ( UFRG) .

Description. The overall somatic morphology is as described for I. scutellata , except for the following features. Two color morphs: the specimens from Roraima, Brazil, have low-contrasting punctures giving to the cuticle a light brown appearance ( Figs. 41A–B and 42A–B ); the specimens from Bolívar, Venezuela, high-contrasting, dark punctures giving to the cuticle a dark brown appearance ( Figs. 41C–D and 42C–D ). Head. Labrum inserted anteriorly to half the distance between the anterior margin of the eyes and apex of mandibular plates. Antennae: segments I to III dark yellowish, segments IV to V brown; segments ratio: I≥II<III<IV<V.

Thorax. Hemelytra: corium as long as scutellum; spot at apex of the radial vein absent. Pro-, meso- and metasternum dark yellowish and densely punctured. 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 narrow, subequal; urosternite VII unarmed.

Male. Apical margin of membrane of hemelytra convex; 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 ( Fig. 43A , dr) and ventral rim shallowly concave ( Fig. 43B , vr). Posterolateral angles 1.4 times longer than the rest of the pygophore, base perpendicular and apex oblique to the frontal plane, convergent from the base ( Fig. 43 A−C, pla). Setae short on posterior half of ventral and lateral surfaces of pygophore and on outer surface of posterolateral angles; setae long on ventral rim, except on median excavation. Segment X as wide as long, not reaching the apex of the posterolateral angles; rounded, narrower at the base; basal and apical margins and midbasal region membranous; dorsal surface covered by setae ( Figs. 43A–C, X; 43J–K ). Parameres falciform, flat, shorter than posterolateral angles, subparallel to the frontal plane; outer margin sinuous, distal portion strongly convex; inner margin sinuous, distal portion strongly excavated and with an aculeiform apical process, convergent and ventrolaterally directed; apical margin convex; ventral surface with sinuous longitudinal crest ( Fig. 43B and E , vcp), setae covering the region posterior to the crest ( Figs. 43B , pa; 43D−G). Cup-like sclerites externally visible, apices convergent ( Fig. 43B , cls). Phallus: proximal portion of vesica convex ventrally; distal portion bent ventrally; secondary gonopore ventral and beveled ( Fig. 43 H−I).

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 subrectilinear, and projections urosternite VII laminate as described for I. scutellata ( Fig. 43L–M , mpr). Genitalia. Valvifers VIII wider than long, posterior margin subrectilinear and slightly oblique to the median line; sutural margins subrectilinear and folded dorsally; setae on the distal half of sutural margins and on median half of posterior margin ( Figs. 5K , 43L–M , vf8). Valvifers IX almost completely covered by valvifers VIII; lateral margin convex, setae sparse on mid-basal portion of ventral surface. Laterotergites IX reaching the posterior margin of mediotergite VIII; lateral margin convex; setae on mid-basal portion of lateral and ventral surfaces ( Fig. 43L–N , la9). Thickening of vaginal intima sub-hexagonal, wider than long; distal margin more sclerotized and slightly concave; median area subrectangular, membranous ( Fig. 43N , vi). Vesicular area anterior to the collar 1/10 of the posterior portion; median duct with proximal widening both anterior and posterior to the collar ( Fig. 43N , md, mdp); inner duct distended not coiled ( Fig. 43N , id). Distal ductus receptaculi of same caliber as the proximal ( Fig. 43N , drd, drp). Pars intermedialis cylindrical ( Fig. 43N , pi); proximal annular crest directed to the ductus receptaculi, and about half the diameter of the distal crest, the latter perpendicular to the pars intermedialis ( Fig. 43N , dac, pac). Capsula seminalis globose with two lateral filiform projections directed to the pars intermedialis, one twice longer than the other ( Fig. 43N , cs, pr).

Measurements: Table 19.

Distribution. Venezuela (Bolívar), Brazil (Roraima) ( Fig. 8 ).

Comments. See comments in I. coralinae sp. n.. Ischnopelta pellucidula sp. n. differs by the longitudinal crest on the ventral surface of parameres ( Fig. 43E , vcp), that is oblique or transversal in the other species of the I. coralinae sp. n. group ( Figs. 18G , vcp; 24G, vcp; 29G, vcp; 31G, vcp; 39D, vcp; 44G, vcp).

Figures

FIGURE 3. Ischnopelta pellucidula Rosso & Campos, sp. n. Female genitalia highlighting the proximal portion of the spermathecal vesicular area. Abbreviations: cl, collar; id, internal duct, idp, proximal internal duct; md, median duct; mdp, proximal median duct; od, external duct; odp, proximal external duct; va, vesicular area. Scale bar = 0.5 mm.

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 18. Ischnopelta coralinae 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: amp, apical margin; cls, cup like sclerites; dr, dorsal rim; pa, parameter; ph, phalloteca; pla, posterolateral angle; vcp, ventral crest; vr, ventral rim; vs, vesica; X, segment X.

FIGURE 41. Ischnopelta pellucidula Rosso & Campos, sp. n. Holotype male (specimen from Rio Ireng, Roraima, Brazil) A, dorsal view; B, ventral view. Male (specimen from Department of Bolívar, Venezuela). C, dorsal view; D, ventral view.

FIGURE 42. Ischnopelta pellucidula Rosso & Campos, sp. n. Female (specimen from Rio Ireng, Roraima, Brazil). A, dorsal view; B, ventral view. Female (specimen from Department of Bolívar, Venezuela). C, dorsal view; D, ventral view.

FIGURE 43. Ischnopelta pellucidula Rosso & Campos, sp. n. Male. A–C, pygophore: dorsal, ventral and posterior views respectively; D–G, parameters:dorsal, ventral, external and internal lateral views, respectively; H–I, phallus: lateraland dorsal views, respectively; J–K, segment X, dorsal and ventral views, respectively. Female. L–M, genital plates ventroposterior view (45º) of specimen from Rio Ireng, Roraima, Brazil and specimen from Department of Bolívar, Venezuela, respectively; N, internal genitalia. Abbreviations: cl, collar; cls, cup like sclerites; cs, seminalis capsule; dac, distal annular crest; dr, dorsal rim; 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; pa, parameter; pac, proximal annular crest; ph, phalloteca; pi, pars intermedialis; pla, posterolateral angle; pr, projection; t8, mediotergite VIII; va9, valvulae IX; vcp, ventral crest; vf8, valvifer VIII; vf9, valvifer IX; vi, thickening of vaginal intima; vr, ventral rim; vs, vesica; X, segment X.