Ischnopelta cylindrata 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 : 140-141

publication ID	https://doi.org/ 10.11646/megataxa.6.2.3
DOI	https://doi.org/10.5281/zenodo.5753398
persistent identifier	https://treatment.plazi.org/id/03828787-2C11-FFB6-FF77-FF36FD3D04BE
treatment provided by	Plazi
scientific name	Ischnopelta cylindrata Rosso & Campos
status	sp. nov.

Treatment

Ischnopelta cylindrata Rosso & Campos , sp. n. ( Figs. 5E View FIGURE 5 , 26 View FIGURE 26 )

Etymology. The epithet refers to the uniform cylindrical shape of the female inner duct of the vesicular area. Latin: cylindratus = cylinder shape, cylindrical.

Type locality. BRAZIL, Minas Gerais, Ouro Preto , [-20.3874, -43.5067] GoogleMaps .

Holotype. Female. BRAZIL, Minas Gerais, Ouro Preto (Topázios), 22.XI.1962, J. Bechyné col. Deposited at Museu de Zoologia da Universidade de São Paulo ( MZSP), São Paulo ( SP), Brazil.

Other material examined. One female abdomen whose determination as I. cylindrata was made by comparison of the valvifers VIII, enabling the examination of the internal genitalia.

Description. The overall somatic morphology is as described for I. scutellata , except for the following features. Body densely punctured, brownish. Head. Ventral surface of mandibular plates with minute dark brown to black punctures, and long and thick setae on mid-apical band. Maxillary plates and ocular peduncles densely punctured. Bucculae slightly higher than the first labial segment. Labrum inserted posteriorly to half the distance between the anterior margin of the eyes and the apex of mandibular plates. Antennae segment I dark yellowish with brown blotches, segments II and III brown ventrally and dark yellowish dorsally, segment III dorsally punctured, segments IV and V dark brown; antennal segment ratio: I>II<III<IV<V.

Thorax. Hemelytra: corium as long as scutellum; minute spot at apex of radial. Pro- and mesosternum punctured, metasternum unpunctured. Pro-, meso- and metapleura densely punctured.

Abdomen. Dark spots at the lateral of urosternites subtriangular.

Male. Unknown.

Female. Membrane of hemelytra with apical margin convex, dark brown, not reaching the posterior margin of mediotergite VIII; median portion of posterior margin of mediotergite VIII concave; median portion of posterior margin of urosternite VII subrectilinear; projections on the lateral 1/3 of the posterior margin of urosternite VII long and narrow, and perpendicular to the surface of urosternite VII ( Fig. 26C View FIGURE 26 , mpr). Genitalia. Valvifers VIII wider than long; posterior margin subrectilinear and transversal to the median line, cut obliquely on the lateral; sutural margins subrectilinear and folded dorsally; surface dark yellowish with dense brown punctures, dorsoposteriorlly curved on distal portion; setae long on median half of posterior margin and on posterior half of the sutural margin; basal portion with narrow and shallow longitudinal grooves ( Figs. 5E View FIGURE 5 ; 26C View FIGURE 26 , vf8). Valvifers IX exposed; lateral margin convex; sparse setae on mid-basal portion of ventral surface ( Fig. 26C–D View FIGURE 26 , vf9). Laterotergites IX not reaching the posterior margin of mediotergite VIII; lateral margin sinuous; setae on median portion of lateral margin and on mid-basal portion of ventral surface ( Fig. 26C–D View FIGURE 26 , la9). Thickening of vaginal intima wider than long; cordiform and distally emarginated; lateral margins strongly convex; median area with small membranous cone ( Fig. 26D View FIGURE 26 , vi). Vesicular area: anterior portion to the collar 1/8 of the posterior portion; median duct anterior to the collar cylindrical ( Fig. 26D View FIGURE 26 , mdp); median duct posterior to the collar with proximal and distal widening ( Fig. 26D View FIGURE 26 , md); inner duct coiled in the proximal widening ( Fig. 26D View FIGURE 26 , id). Distal ductus receptaculi 0.4 the length of the vesicular area posterior to the collar ( Fig. 26D View FIGURE 26 , drd, drp). Pars intermedialis barrel-shaped ( Fig. 26D View FIGURE 26 , pi). Annular crests slightly convergent, the proximal one slightly larger than half the diameter of the distal one ( Fig. 26D View FIGURE 26 , dac, pac). Capsula seminalis globose, with one laterobasal filiform projection surpassing the proximal annular crest ( Fig. 26D View FIGURE 26 , cs, pr).

Measurements: Table 10.

Distribution. Brazil (Minas Gerais) ( Fig. 6 View FIGURE 6 ).

Comments. Ischnopelta cylindrata sp. n. differs from other species bye the mandibular plates wider anterolaterally, with ventral minute punctures ( Fig. 26A–B View FIGURE 26 ) and thicker mid-apical setae about 3 times longer than observed in other species. This is the only species in the genus whose median duct of the vesicular area is cylindrical anterior to the collar ( Fig. 26D View FIGURE 26 , mdp).