Anhanga modesta Distant, 1887

Bianchi, Filipe M., Barcellos, Aline & Grazia, Jocelia, 2016, Rediscovering Anhanga: redescription and considerations on its taxonomic placement (Hemiptera: Heteroptera: Pentatomidae), Acta Entomologica Musei Nationalis Pragae 56 (2), pp. 557-566 : 560-563

Anhanga modesta Distant, 1887

( Fig. 1 )

Anhanga modesta Distant, 1887 : lx (original description).

Ahanga modesta: LETHIERRY & SEVERIN (1893): 89 (catalogue).

Anhanga modesta : KIRKALDY (1909): 221 (catalogue); PIRÁN (1968): 18 (record); SYNAVE (1969): 15 (list of types, inadvertent lectotype designation).

Type material. LECTOTYPE (designated byassumptionofholotypeby SYNAVE 1969): ♀ (badly damaged,see Figs 2A–C ), bearing the following labels ( Fig. 2 D ): a) Rio grandedo Sul [black text on green label], b) Coll. Camille Van Volxem, c) M.R. Belg., d) 1875, e) Anhanga modesta Dist ., f) HOLOTYPE, and g) Anhanga modesta Distant ( SYNAVE 1969). Material examined. BRAZIL: RIO GRANDE DO SUL: São Francisco de Paula (Pró-Mata), 16.–17.iii.2012, 1 ♀, M. Pinkoski & J.K. Carvalho ( MCNZ) ; no data, 1 ♀ ( AMNH) ; Mato Catelhano – RS – BR, Flona de Passo Fundo , Estrada principal, 13.xii.2012, 1 1 ♀, Bottega C. col. ( UFRG) .

Redescription. Moderate to large size (17.5– 19 mm), wide ovoid. General color yellowish brown, black punctures on dorsal and ventral surfaces; antennae and legs with similar color pattern ( Fig. 1A ).

Head almost as long as wide across eyes, densely punctured on vertex. Mandibular plates rounded and convergent, sometimes contiguous apically; lateral margins slightly deflected. First antennal segment nearly reaching apex of head, but not surpassing it; proportion of antennal segments: I <II <III <IV <V. Rostrumreaching metasternum.

Thorax. Pronotum wider than long; anterolateral margins slightly crenulate; humeri rounded, slightly prominent. Scutellum subtriangular, with black punctures, foveae present at basal angles. Peritreme spout-shaped, very short, about 1/6 of distance from ostiole to lateral margin of metapleuron ( Fig. 1D ). Legs with black punctures; tibiae dorsally sulcate ( Fig. 1C ). Corium surpassing scutellum and almost reaching posterior margin of tergite VI. Membrane translucent and with five parallel longitudinal veins.

Abdomen. Connexivum broadly exposed, with black stripesat posteriorand anterior outer angles of segments. Anterior margin of abdominal segment VII, in males, deeply concave, V-shaped, resulting in segment VI being quite narrow medially; in females, anterior margin is U-shaped, not so markedly excavate. Posterior margin of segment VII black and bearing short and close wrinkles. Spiracles black, each on yellowish callus ( Fig. 1E ).

Male genitalia ( Figs 3C–H ). Pygophore globose, dorsal rim tumid over segment X, with flat expansion lateral to segment X. Posterolateral angles acute, convergent and surpassing ventral rim. Superior layer of ventral rim with 1+1 dorsoventrally depressed processes lateral to the apex of segment Xand rounded at apex. Dorsal rim uniformly concave between lateral emarginations. Parameres spatulate, laterally compressed, parallel to lateral walls of segment X. Segment Xwider in middle, narrowing toward apex; portion posterior to this enlargement with subparallel margins, its width equal to about half the width of portion anterior to enlargement. Setae densely distributed on dorsal rim, dorsum and apex of posterolateral angles, projections of superior layer of ventral rim and enlarged portion of segment X, longer on the last two structures.

Female genitalia ( Figs 3A–B and 4 ). Gonocoxites VIII somewhat quadrangular; sutural margins parallel, not contiguous; anterolateral margin rounded and posterior margin slightly concave onareaadjacent togonocoxites IX. Gonocoxites IX trapezoidal, anterior and posterior marginsconcavemedially.Armsof gonocoxites IX slightly curved, about half of anterior width of the plate. Laterotergites IXeach with rounded apex, not surpassing transverse band linking laterotergites VIII. Segment Xwith thintransverse striae. Gonapophyses IX withsecondary thickenings ‒ one oblong, more sclerotized, in middle, and 1+1 before each ring sclerite. Thickening of vaginal intima in two portions, the anterior globose, withopening of ductusreceptaculi, and the posterior conical. Vesicular area expanded, median wall with conspicuous enlargement at base. Ductus receptaculi proximalis as long as ductus receptaculi distalis. Capsula seminalis with finger-like process; anterior and posterior flanges convergent to each other; pars intermedialis slightly enlarged.

Measurements. See Table 1 .

Distribution. Brazil: Rio Grandedo Sul, biome Atlantic Rain forest ( DISTANT 1887, PIRÁN 1968, this paper).

Comment. Describing Anhanga modesta , DISTANT (1887) did not indicate the sex or the number of specimens he used, but provided onlya single measurement, while he frequently provided length span for other species in the same paper. Based on the original description SYNAVE (1969) considered the single specimen depositedin IRSNB the holotype. Aswe cannot be absolutely sure how many specimens the original description was based on, we consider SYNAVE’ s (1969) action an inadvertent designation of lectotype by assumption of holotype ( ICZN 1999: Article 74.6).

Figures

Fig. 1. Anhanga modesta Distant, 1887. A – dorsal view; B – magnification of the head in ventral view, dashed line highlighting the basal segment of labium arising anteriorly to the imaginary line traversing head at anterior margin of eyes; C – ventral view; D – magnification of external scent efferent system of metathoracic scent glands; E – magnification of abdomen, highlighting the placement of the pair of trichobothria (arrows) along the imaginary line of spiracles on urosternites VI and VII. Scale bar: 5 mm.

Fig. 2. Lectotype of Anhanga modesta Distant, 1887.A – dorsal view; B – ventral view; C – lateral view; D – genital plates in postero-ventral view; E – labels. Scale not provided.

Fig. 3. Anhanga modesta Distant, 1887, external genitalia.A–B – genital plates in postero-ventral view; C–H – pygophore; C–D – dorsal view; E–F – posterior view; G–H – ventral view. Abbreviations: dr – dorsal rim; gc8 – gonocoxites VIII; gc9 – gonocoxites IX; la8 – laterotergites VIII; la9 – laterotergites IX; pa – paramere; pvr – process of ventral rim; slr – superior layer of ventral rim; vr – ventral rim; X – tenth segment. Scale bar: 1 mm.

Fig. 4. Internal female genitalia of Anhanga modesta Distant, 1887. Abbreviations: aaf – anterior annular flange; cs – capsula seminalis; dr – ductusreceptaculi; g9 – gonapophyses IX; gc9 – gonocoxites IX; la8 – laterotergites VIII; la9 – laterotergites IX; or – orificium receptaculi; paf – posterior annular flange; pc – pars communis; pcs – finger-like process of capsula seminalis; pi – pars intermedialis; rs – ring sclerites; tvi – thickening of vaginal intima; va – vesicular area; X – tenth segment). Scale bar: 1 mm.