Stapecolis Garbelotto & Campos

Garbelotto, Thereza De A., Campos, Luiz A. & Grazia, Jocelia, 2016, Stapecolis, new genus of Ochlerini (Hemiptera: Pentatomidae: Discocephalinae), Zootaxa 4137 (4), pp. 545-552 : 546-549

Stapecolis Garbelotto & Campos gen. nov.

Type species: Stapecolis latus Garbelotto & Campos sp. nov., here designated.

Etymology. The name refers to the shape of the ventral rim opening of the male pygophore. Latin: stapes (m.), stirrup; colis, male genitalia.

Description. Body elongated, general color brown to black with black punctures. Corium with 1+1 yellow spots at apex of radial vein ( Figs. 2–3 ). Antennae five-segmented. Ventral rim of pygophore subrectangular ( Figs. 5 and 7 ).

Head wider than long, declivous; punctures confluent forming wrinkles from base of clypeus to posterior margin of head. Mandibular plates longer than clypeus, apart at apex, this rounded; lateral margins sinuous and reflected. Vertex weakly tumescent. Anteocular process truncated and not projected. Eyes on a short peduncle. Antennal tubercles with lateral spine, visible from above. Antennae five-segmented, segment II the shortest. Ventrally on head 1+1 longitudinal carinae posterior to the eyes, concolorous with the surrounding surface. Bucculae elevated, evanescent posteriorly, not attaining posterior margin of head, with triangular anterior tooth, and narrowed on anterior third. Rostrum not reaching anterior margin of urosternite V; first segment attaining prosternum; insertion of first segment of labium posterior to anterior limit of eyes.

Pronotum wider than long, punctures confluent forming wrinkles on posterior half; anterior half declivous. Cicatrices flat. Anterior margin concave on the median third. Anterior angle of pronotum developed as acute tooth, projected laterally by the ocellus diameter. Anterolateral margins of pronotum crenulated; posterior margin subrectilinear; posterolateral margins slightly concave. Scutellum longer than wide, reaching connexival segment V; punctures confluent, forming wrinkles on scutellum disc. Corium longer than scutellum, reaching connexival segment VI; punctures dense and not confluent; 1+1 yellow maculae at apex of radial vein. Hemelytral membrane not surpassing apex of abdomen, with nine veins. Pro-, meso- and metathorax black, punctures not confluent. Prosternum sulcate, meso- and metasternum with median carina along entire length. Mesopleural evaporatorium black, occupying a thin area along the posterior margin of mesopleurae; metapleural evaporatorium black, occupying half the width of metapleurae, lateral margin subrectilinear. Peritreme in spout. Tibiae sulcate dorsally; third segment of metatarsi dorsally flat in males and dorsally sulcated in females.

Connexivum exposed from segments III to VIII; punctures smaller than in the remaining dorsal surface of the body, narrow lateral strip without punctures. Abdomen with punctures inconspicuous or absent on disc and external to trichobothria. Trichobothria lateral to imaginary line tangential to spiracles. Spiracles black, somewhat elevated, visible on sternites II–VII.

Male. Antennae: third segment the widest, twice wider than the next segment. Articular membrane along the posterior margin of urotergite VII expanded medially.

Genitalia. Pygophore subquadrangular ( Figs. 4–7 ). Posterolateral angles rounded, narrowed by the foliaceus projection of the inferior layer of ventral rim. Dorsal rim concave, with 1+1 expansions laterad to segment X ( Figs. 4, 6 ; dr, pa). Inferior layer of ventral rim with 1+1 foliaceus projection over genital cup, directed dorso-anteriorly, parallel to frontal plane of pygophore, their apex surface with a small spinose carina lateral to segment X ( Figs. 4, 6 ; pil, ca); 1+1 subrectangular expansion, below the ventral opening of ventral rim, originated on the lateral margin of foliaceus projection of inferior layer of ventral rim ( Figs. 4, 6 ; rp); outline of ventral opening of ventral rim projected and inferior layer of ventral rim with median conical projection, continued laterally and directed to posterolateral angles ( Figs. 5, 7 ; cp). Median margin of ventral rim excavated, forming a rectangular opening where the parameres project over ( Figs. 5, 7 ; vr, par); surface between ventral opening and posterolateral angles excavated. Segment X subtrapezoidal not exceeding the posterior limit of inferior layer of ventral rim; basal third membranous, apex narrowed and surrounded by fringe of bristles; lateral margin sinuous with 1+1 median tuft of bristles ( Figs. 4, 6 ; X); anal opening apical and genital opening ventral as longitudinal slit ( Figs. 5, 7 ). Parameres ventral to segment X, projected over ventral opening of ventral rim, apex rounded with long bristles.

Female. Antennae: third segment as wide as the subsequent.

Genitalia. Gonocoxites 8 longer than wide, tumescent on disc ( Fig. 8 ; gc8). Laterotergites 8 triangular, spiracle visible and posterior to lateral angle of gonocoxites 8 ( Fig. 8 ; la8). Laterotergites 9 digitiform, slightly depressed on middle; apex truncated, not surpassing laterotergites 8 ( Fig. 8 ; la9). Segment X covered by laterotergites 9.

Distribution. Panama, Colombia.

Comments. Stapecolis gen. nov. is proposed based on the clade H ( Fig. 1 ) of the phylogeny of the Herrichella clade ( Garbelotto et. al. 2013). The genus is supported by 10 synapomorphies, including both somatic and male genital morphology; the following six are highlighted because they are also diagnostic characters: the anterolateral margins of pronotum crenulated, and the pygophore structures—dorsal rim with 1+1 expansions laterad to segment X; apex of the foliaceus expansions of the inferior layer of ventral rim with a small spinose carina; the absence of lobular expansions on superior layer of ventral rim; presence of subrectangular expansions below the ventral opening of ventral rim; and the subrectangular ventral opening of pygophore.

Although only the presence of the spinose carina apical on the foliaceus expansions is unique in Ochlerini, the closely related genera ( Fig. 1 ) have different states for the characters listed above, e.g. dorsal rim with 2+2 expansions laterad to segment X, the presence of lobular expansions on superior layer of ventral rim, and the ventral opening of pygophore not subrectangular (varying in each genera—see Garbelotto et al. 2011 —figs 3–4, 7– 8; 2013—fig 9B; 2014—figs 5, 8). Besides the synapomorphies, Stapecolis gen. nov. has other particularities in the female genitalia as the gonocoxites 8 with calluses on disc closer to its posterior margin and this projected over the laterotergites 9, and the yellow maculae on corium.

The sister-group of Stapecolis gen. nov. is the clade I ( Fig. 1 ) that includes Alitocoris brunneus Sailer (sedis mutabilis) and other two new species (to be described elsewere). Species of clade I are supported by female characters: the sutural margins of gonocoxites 8 tumescent and its callosities projected to the lateral angles—two characters states absent in Stapecolis gen. nov.. This sister-group relationship ( Fig. 1 ) is supported by the second antennal segment shorter than the first and the presence of a carina on gonocoxites 9.

Key to the species of Stapecolis gen. nov.

1 Yellow maculae at apex of radial vein of corium equal to ocellus diameter; scutellum with 1+1 spots on fovea....................................................................................... Stapecolis latus sp. nov. ( Fig. 2 )

- Yellow maculae at apex of radial vein of corium equal to eye diameter; scutellum without spots on fovea..................................................................................... Stapecolis bimaculatus sp. nov. ( Fig. 3 )

Figures

FIGURE 1. Relationships of the clade F (Herrichela clade of Ochlerini), modified from Garbelotto et al. (2013). In red, Stapecolis gen. nov.; in blue its sister group.

FIGURE 8. Stapecolis latus sp. nov., female genitalia. Abbreviation: gc 8, gonocoxites 8; la 8, laterotergites 8; la 9, laterotergites 9; VII, sternite VII. Scale bar: 1 mm.

FIGURES 2 – 3. 1, Stapecolis latus sp. nov., male holotype; 2, Stapecolis bimaculatus sp. nov., male holotype. Scale bars: 1 mm.

FIGURES 4 – 7. Stapecolis, male genitalia. Stapecolis latus sp. nov.: 3, dorsal view; 4, ventral view; Stapecolis bimaculatus sp. nov.: 5, dorsal view; 6, ventral view. Abbreviations: ca, carina; cp, conical projection; dr, dorsal rim; pa, posterolateral angle; par, paramere; pil, projection of inferior layer of ventral rim; rp, rectangular projection; vr, ventral rim; X, segment X. Scale bar: 1 mm.