Alloeogyna Garbelotto & Campos, 2019

Garbelotto, Thereza De A., Grazia, Jocelia & Campos, Luiz Alexandre, 2019, Description of two new genera of Ochlerini (Hemiptera: Pentatomidae: Discocephalinae), Zootaxa 4612 (3), pp. 387-400 : 388-390

Alloeogyna Garbelotto & Campos gen. nov.

Type species: Alitocoris brunneus Sailer, 1950 , here designated.

Etymology. The name refers to the presence and shape of callosities in the female genital plates, unique among Neotropical pentatomids. Greek: alloios, another kind, different; gyne, female.

Description. Body oval, general color brown sometimes with pale to yellowish maculae and with small maculae at apex of radial vein on corium ( Figs. 2–4 ). Antennae four- or five-segmented. Gonocoxites VIII with posterolateral callus. Pygophore with open posterolateral angles; inferior layer of ventral rim with foliaceus projections directed dorso-anteriorly.

Head wider than long, declivous; punctures sometimes confluent forming wrinkles from the base of clypeus to the posterior margin of head; vertex tumid or flat. Mandibular plates longer than clypeus, apart at apex, apex rounded; lateral margins sinuous and reflected. Anteocular processes truncated. Antennal tubercles with a lateral spine. Antennae four- or five-segmented. Ventrally 1+1 longitudinal carinae posterior to the eyes, concolor with the surrounding surface to yellowish. Bucculae elevated, with an anterior triangular tooth and evanescent posteriorly, not attaining posterior margin of head. Labium reaching urosternites IV to VI, first segment on prosternum.

Pronotum wider than long, declivous; punctures confluent forming wrinkles between humeral angles. Cicatrices slightly tumid, punctured. Anterior margin concave medially; anterior angles with a small tooth projected laterally.Anterolateral margins slightly sinuous and reflected; posterior margin convex. Scutellum longer than wide, reaching connexival segment V; punctures forming shallow wrinkles on disc. Foveae black, flat and with inconspicuous punctures. Corium longer than scutellum, reaching at least the connexival segment VI; punctures denser on exocorium; 1+1 small pale to yellowish maculae at apex of radial vein. Membrane with six to eight veins. Pro-, meso- and metapleura with sparse punctures; pro- and mesosternum punctured and metasternum without punctures. Prosternum furrowed, meso- and metasternum with median thin carinae along entire length. Mesopleural evaporatorium narrow following posterior margin of mesopleura; metapleural evaporatorium occupying half the width of metapleura, lateral margin subrectilinear; peritreme spout, reaching half the evaporatorium width. Tibiae sulcated dorsally; third segment of metatarsi depressed dorsally in males and females.

Connexivum exposed from segments III to VII with a narrow lateral strip without punctures. Abdomen sometimes punctured on lateral margins; longitudinal furrow shallow on median third. Trichobothria lateral to an imaginary line tangential to spiracles; spiracles black, visible from urosternites II to VII.

Male. Antennae: third to last segment the widest, about two times wider than the next segment; also wider than corresponding segment in females. Articular membrane on posterior margin of tergite VII concave.

Genitalia. Pygophore globose ( Figs 6–11 ). Posterolateral angle opened ( Figs 6, 9 - pa). Dorsal rim concave ( Figs 6, 9 - dr), with enlarged margin with less sclerotized appearance at base of posterolateral angles. Inferior layer of ventral rim with 1+1 foliaceous projections with rounded apex over genital cup, almost parallel to frontal plane of pygophore ( Figs 6, 9 - pil). Surface beneath foliaceous projections with striated lobular expansions, these striae attaining lateral margins of the projections ( Figs 6, 9 , 19–20 ). Inferior layer of ventral rim with a median rhomboid conical projection, continued laterally as a low carinae directed to posterolateral angles. Median third of ventral rim U-shaped, with subtriangular ventral opening ( Figs 7, 10 ). Segment X subquadrangular with basal half membranous; apex with setae and not exceeding the posterior limit of inferior layer of ventral rim; lateral margins of the sclerotized portion expanded, and carinated, bearing dense tufts of long setae directed posterolaterally; anal opening apical; genital opening ventral in a longitudinal slit ( Figs 6–11 ). Parameres ventral to, and hidden by the segment X ( Figs 7–8, 10–11 ), elongated; head bilobed, covered with long setae, ventral lobe projected through the opening of ventral rim ( Figs 7–8, 10–11, 16–18 ). Phallus ( Figs 12–15 ). Phallotheca bulb shaped; basal lateral projections paired, broad and spatulated, with truncated apex ( Fig. 15 , lph); ventral and dorsal processes sinuous ( Figs 13, 15 , dp). Ductus seminis distalis surpassing base of phallotheca ( Figs 12–15 ).

Female. Antennal segments uniformly wide.

Genitalia. Gonocoxites VIII longer than wide; posterior margin subrectilinear to sinuous over laterotergites IX; disc with posterolateral callus and sutural margins elevated, both varying in size; surface between sutural margins and calli with oblique wrinkles ( Figs 21–23 ). Laterotergites VIII triangular, wider than long; spiracles present in a callus and posterior to lateral angle of gonocoxites VIII ( Figs 21–23 ). Gonocoxites IX reduced to thin longitudinal carina externally ( Figs 21–23 ), and inner portion medially narrowed ( Figs 25–26 ). Laterotergites IX triangular, with rounded apex not surpassing the posterior margins of laterotergites VIII; lateral and mesial margins levelled ( Figs 21–23 ); in inner view anterior margin sinuous ( Figs 25–26 ). Segment X hidden by laterotergites IX. Pars comunis with conical microsculptures. Gonapophyses VIII and IX with folds bearing conical microsculptures; folds of gonapophyses IX following anterior margin of gonocoxites IX ( Figs 25–26 ). Thickening of gonapophyses IX as 1+1 circles, each one lateral to the margins of thickening of vaginal intima ( Figs 25–26 ). Ring sclerites laterally constricted. Median duct of vesicular area enlarged at base; pars intermedialis longer than wide; processes of capsula seminalis thin; annular crests narrowed.

Remarks. Alloeogyna gen. nov. is proposed based on the phylogeny of the Herrichella clade (Ochlerini) to include the species in clade I ( Fig. 1 ) ( Garbelotto et al. 2013). The two synapomorphies supporting clade I are female traits: the sutural margins of gonocoxites VIII swollen in the apical half (character 51(1) of Garbelotto et al. 2013), and the callus on the disc projecting to the lateral angles of gonocoxites VIII (character 52(2) of Garbelotto et al. 2013). Other characters are recognized as diagnostic for the genus, as follows. For females: gonocoxites IX reduced to thin longitudinal carinae externally, and laterally narrowed internally (character 62(1) of Garbelotto et al. 2013), laterotergites IX with a basal constriction internally (character 64(1) of Garbelotto et al. 2013) and the thickening of gonapophyses IX composed of a pair of circles (character 67(4) of Garbelotto et al. 2013). For males, the subrectangular projections of the inferior layer of ventral rim, posterolateral angles opened, ventral opening of pygophore triangular, 1+1 lateral carinae on segment X, and bilobed parameres.

Alloegyna gen. nov. is the sister group of Stapecolis Garbelotto & Campos and this relationship is supported by the second antennal segment shorter than the first, and the gonocoxites IX as a carina externally ( Garbelotto et al. 2013, 2016). Stapecolis is supported by other synapomorphies and shows some unique pygophoral characters ( Garbelotto et al. 2016).

Distribution. Mexico, Guatemala, Honduras, El Salvador and Nicaragua.

Key to the species of Alloeogyna Garbelotto & Campos gen. nov.

2. Total length less than 10mm; labium reaching fifth urosternite; corium reaching half of connexivum VI; body dorsal surface light brown with 1+1 pale spots at lateral angle of the cicatrices of pronotum, and 1+1 pale spots on margin of foveae; ventral surface of head with yellowish longitudinal maculae posterior to the eyes............. Alloeogyna poecila sp. nov. ( Fig. 3 )

2’. Total length at least 11mm; labium reaching fourth urosternite; corium reaching posterior margin of connexivum VI; body dorsal surface brown, without spots at lateral angle of the cicatrices of pronotum, and on margin of foveae; ventral surface of head without yellowish maculae.............................................. Alloeogyna ampla sp. nov. ( Fig. 4 )

Figures

FIGURE 1. Relationships of the ‘clade D’ of the Herrichela clade of Ochlerini, showing the relationships between Sailerus gen. nov., Alloeogyna gen. nov. and close related genera, as well relationship between Alloeogyna gen. nov. species. Modified from Garbelotto et al. (2013).

FIGURES 2–5. 2, Alloeogyna brunnea (Sailer) comb. nov., male; 3, Alloeogyna poecila Garbelotto & Campos sp. nov., male holotype; 4, Alloeogyna ampla Garbelotto & Campos sp. nov., female holotype; 5, Sailerus maculosus (Sailer) comb. nov., female holotype. Scale bars: 1 mm.

FIGURES 6–18. Alloeogyna Garbelotto & Campos gen. nov. male genitalia. 6–8, All. brunnea (Sailer) comb. nov. pygophore dorsal, ventral and posterior; 9–11, All. poecila Garbelotto & Campos sp. nov. pygophore dorsal, ventral and posterior. 12–15, All. brunnea comb. nov. phallus dorsal, posterior, anterior and lateral; 16–18, All. brunnea comb. nov. right paramere dorsal, ventral and lateral. Abbreviations: cp, conical projection; dp, dorsal process of phallotheca; dr, dorsal rim; ds, ductus seminis distalis; lph, lateral projection of phallotheca; pa, posterolateral angle; par, paramere; ph, phallotheca; pil, projection of inferior layer of ventral rim; v, vesica; vp, vesica process; vr, ventral rim; X, segment X. Scale bars: 1 mm.

FIGURES 19–20. Alloeogyna brunnea (Sailer) comb. nov. scanning electron microscopy of the surface beneath the projection of the inferior layer of ventral rim. 19, general view; 20, detail.

FIGURES 21–27. Female genital plates (ventroposterior view) and internal ducts. 21, 25 All. brunnea (Sailer) comb. nov.; 22, 26, All. poecila Garbelotto & Campos sp. nov.; 23, All. ampla Garbelotto & Campos sp. nov.; 24, 27 Sailerus maculosus (Sailer) comb. nov. Abbreviations: cm, conical microsculptures; cs, capsula seminalis; dr, ductus receptaculi; gcVIII, gonocoxites VIII; gcIX, gonocoxites IX; gpIX, gonapophyses IX; id, inner duct of vesicular area; laVIII, laterotergites VIII; laIX, laterotergites IX; md, median duct of vesicular area; od, outer duct of vesicular area; pi, pars intermedialis; rs, ring sclerites; tgIX, thickening of gonapophyses IX; vi, thickening of vaginal intima; VII, urosternite VII. Scale bars: 1mm.