Ischnopelta ruckesi 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 : 172-175

Ischnopelta ruckesi Rosso & Campos , sp. n. ( Figs. 5J , 44–45 )

Etymology. The epithet is in honor of Dr. Herbert Ruckes, who worked at the American Museum of Natural History (AMNH) and started, without concluding, the revision of Ischnopelta . He suggested in his manuscript four epithets used here to name the new species.

Type Locality. BRAZIL, Minas Gerais, Carmo do Rio Claro [-20.9746, -46.1134] .

Holotype. Male. BRAZIL, Minas Gerais, Carmo do Rio Claro, I.1958, Carvalho & Becker. Deposited at the Museu de Zoologia da Universidade de São Paulo ( MZSP), São Paulo (SP), Brazil.

Paratypes. 3 males and 7 females. BRAZIL, São Paulo, Batatais , 2females, XII.1943, [-20.8922, -47.5901], ( MCZN, Coleção Padre Pio ) ; 1 male and 1 female, 3. I .1967, J . Moure, [-20.8922, -47.5901], ( DZUP); Minas Gerais, São Sebastião do Paraíso , 1 male and 1 female, II .1945, Araújo, [-20.9165, -46.9861], ( MZSP) ; 1 male, 23. II .1945, O . Monte, [-20.9165, -46.9861], ( MCNZ) ; 1 female, 23. II .1945, O . Monte, [-20.9165, -46.9861], ( MZSP); Carmo do Rio Claro , 1 female, I .1958, Carvalho & Becker, [-20.9746, -46.1134], ( MZSP); São Paulo, Iperó, George Oeterer , 1 female, 15.XI.1961, Werner Col., [-23.4464, -47.5167], ( UFRG) .

Description. The overall somatic morphology is as described for I. scutellata , except for the following features. Body densely punctured, brownish. Head. Labrum inserted anteriorly to half the distance between the anterior margin of the eyes and the apex of mandibular plates. Antennae dark yellowish, slightly darker ventrally and with minute punctures on segments II and II; 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 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. 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 and strongly sclerotized ( Fig. 44C , dr); ventral rim subrectilinear with wide and shallow median depression ( Fig. 44D , vr). Posterolateral angles 1.6 times longer than the rest of the pygophore, base perpendicular and apex oblique to the frontal plane, convergent from the base ( Fig. 44C–E , pla). Setae short and sparse on posterior half of ventral and lateral surfaces of pygopbore, and on outer surface of posterolateral angles; setae long on ventral and apical margins of posterolateral angles and ventral rim, except on the median depression. Segment X as wide as long, not reaching the apex of posterolateral angles and parameres; rounded; apical margin flat and membranous, lateral margins convex, basal margin narrow and membranous; surface sclerotized and covered by setae, denser on basal half of lateral margins ( Figs. 44C–E, X; 44L–M ). Parameres falciform, flat, as long as the posterolateral angles; subparallel to the frontal plane; outer margin sinuous; apical margin subrectilinear; inner margin sinuous, distal portion strongly excavated and with apical aculeiform process, convergent and ventrolaterally directed ( Fig. 44D, F and G , amp); ventral surface with an oblique crest delimiting a small apical area ( Fig. 44D and G , vcp), covered by setae ( Figs. 44D , pa; 44F–I). Cup-like sclerites externally visible and with convergent apices ( Fig. 44D , cls). Phallus: proximal 2/3 of vesica ventroposteriorly directed, base as wide as the apical margin of phalloteca, ventrally expanded and gradually narrowing; distal 1/3 sinuous, ventrally directed; secondary gonopore ventral and beveled ( Fig. 44J–K ).

Female. Membrane of hemelytra 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 as described for I. scutellata (Fig. 745C, mpr). Genitalia. Valvifers VIII wider than long; posterior margin slightly sinuous and transversal to the median line, with small projection on the lateral angle; sutural margins subrectilinear and folded dorsally; surface dark yellowish with punctures and brown blotches, and narrow and shallow longitudinal grooves; setae on the distal portion of the sutural margins and inner portion of posterior margin 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.

( Figs. 5J ; 45C , vf8). Valvifers IX covered; lateral margin convex, setae on mid-basal portion of ventral surface ( Fig. 45D , vf9). Laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin subrectilinear; setae on mid-basal portion of lateral margin and ventral surface ( Fig. 45C–D , la9). Thickening of vaginal intima sub hexagonal, slightly wider than long; distal margin sinuous and more sclerotized; mid-basal subquadrangular area membranous ( Fig. 45D , vi). Vesicular area anterior to the collar 1/10 of the posterior portion; median duct anterior to the collar with slight proximal widening ( Fig. 45D , mdp), median duct posterior to the collar with proximal and distal widening ( Fig. 45D , md), inner duct not coiled ( Fig. 45D , id). Distal ductus receptaculi of same caliber as the proximal ( Fig. 45D , drd, drp). Pars wider distally ( Fig. 45D , pi); proximal annular crest perpendicular to the pars intermedialis, twice the diameter of the distal crest, this directed to the pars intermedialis ( Fig. 45D , dac, pac). Capsula seminalis globose and with a latero-basal filiform projection directed to the pars intermedialis ( Fig. 45D , cs, pr).

Measurements: Table 20.

Distribution. Brazil (São Paulo, Minas Gerais) ( Fig. 8 ).

Comments. See comments in I. coralinae sp. n.. Ischnopelta ruckesi sp. n. is the only species in the I. coralinae group whose distal portion of the outer margin of the parameres is subrectilinear ( Fig. 44F–G , amp).

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 44. Ischnopelta ruckesi 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 45. Ischnopelta ruckesi 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.