Ischnopelta anangulata 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 : 114-116

Ischnopelta anangulata Rosso & Campos , sp. n. ( Figs. 4C and 13 )

Etimology. The epithet refers to the absence of the posterolateral angles of the pygophore. Latin: a-, an- = not, without (absent) + angularis, -tus = with angles.

Type locality. BRAZIL, Minas Gerais, Pirapora [- 17.3374, -44.9271] .

Holotype. Male. BRAZIL, Minas Gerais, Pirapora, XI.1975, M. Alvarenga. Deposited at the Museu de Zoologia da Universidade de São Paulo ( MZSP), São Paulo ( SP), Brazil.

Description. The overall somatic morphology is as described for I. scutellata , except for the following features. Head. Anterior margin not emarginated. Ocular peduncles scarcely punctured. Antennae: segment I and dorsal surface of segments II and III dark yellowish, the latter brown stained; ventral surface of segments II to V brown; segments ratio: I>II<III<IV<V.

Thorax. Hemelytra: corium as long as scutellum; conspicuous spot at apex of radial vein; radial vein continued by a reddish line. Distal 1/3 of femora and tibiae punctures, some punctures larger than the rest of the body; setae on posterodorsal margin of protibiae as long as the others.

Abdomen. Posterolateral angles of urosternite VII unarmed.

Male. Apical margin of hemelytral membrane convex; urosternite VII reaching anteriorly the imaginary line connecting the spiracles of urosternite V. Genitalia. Dorsal rim of pygophore sinuous, slightly convex on the median portion ( Fig. 13C , dr); ventral rim sinuous, median portion dark-brown and iridescent ( Fig. 13D , vr). Posterolateral angles not developed. Setae short on the median portion of ventral rim and 1 + 1 tufts of long setae on the lateral portions. Segment X wider than long; cordiform and apically emarginated; lateral margins sclerotized and covered by setae; median region membranous ( Fig. 13C, X ). Parameres with flat head, shaped as 1/4 circumference; oblique to the frontal plane; inner margin subrectilinear and strongly sclerotized; ventral surface convex and covered by long setae ( Fig. 13D–E , pa). Phallus not examined.

Female. Unknown.

Measurements: Table 3.

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

Comments. Ischnopelta anangulata can be easily recognized by the apex of the head is not emarginated ( Fig. 13A–B ), the short dorsal surface of pygophore with no development of posterolateral angles ( Fig. 13C–D ), and the parameres and segment X caudally projected and surpassing the ventral rim of pygophore ( Fig. 13D , pa, vr).

Figures

FIGURE 4. Pygophore. A, Ischnopelta bechyneorum Rosso & Campos, sp. n.; B, Ischnopelta vellozia Rosso & Campos, sp. n.; C, Ischnopelta anangulata Rosso & Campos, sp. n. Abbreviations: gc, genital capsule; pla, posterolateral angles. Scale bar = 0.5 mm.

FIGURE 6. Distribution of Ischnopelta alalonga Rosso & Campos, sp. n.; Ischnopelta anangulata Rosso & Campos, sp. n.; Ischnopelta bechyneorum Rosso & Campos, sp. n.; Ischnopelta cylindrata Rosso & Campos, sp. n.; Ischnopelta confusa Rosso & Campos, sp. n.; Ischnopelta coralinae Rosso & Campos, sp. n.; Ischnopelta scutellata (Signoret, 1851).

FIGURE 13. Ischnopelta anangulata Rosso & Campos, sp. n Holotype male. A, dorsal view; B, ventral view; C−E, pygophore: dorsal, ventral and posterior views respectively. Abbreviations: cls, cup like sclerites; dr, dorsal rim; pa, parameter; vr, ventral rim; X, segment X.