Janeirona vianai (Kormilev, 1956)

(Figs. 9–14, 42)

Serdia vianai Kormilev, 1956: 3.

Zimmeria vianai: Ruckes 1958: 20 (syn.).

Zimmerana vianai: Ruckes 1962: 234 (syn.).

Janeirona vianai: Rolston & McDonald 1979: 189 (syn.); Bachmann 1999: 211.

Types examined:

ARGENTINA, Misiones; Serdia vianai Kormilev, 1956; male holotype (Fig. 9). Deposited in: MACN. Labels: Misiones - Argentina / Dep. Concep. - Sta. Maria / XII 52 M. J. Viana // HOLOTYPUS // 53412 // Serdia / vianai / Kormilev, 1953 / Museo Argentino de Ciencias Naturales.

Other material examined:

BRAZIL, Minas Gerais: (Mariléia, Parque Estadual do Rio Doce, -19.7767, -42.6048), female, 13-XII-1978, D'Andretta & Monteiro (MHNJB); São Paulo: (Ribeirão Preto, -21.1794, -47.8849), female, X-1967 (UFRG); (Jundiaí, Serra do Japi, -23.2306, -46.9734), male, 31-4-X-XI-2011, (MZSP).

Diagnosis. Body length ranging from 12.3 mm to 13.5 mm. Antennomeres I not surpassing the mandibular plates; inner margins of mandibular plates concave anterior to clypeus; labium not surpassing half of metasternum. Pronotal lateral margins distinctly depressed dorsally; metasternum transversely arched. Pygophore. Posterolateral angles with rounded apices; ventral rim u-shaped.

Description. Body dark brown; legs, labium, and antennomeres IV and V ocher (Fig. 10). Head wider than long; maximum head width across the mandibular plates less than half the head width across the eyes; posterior margins of the eyes forming an angle of less than 45º with the longitudinal body axis; each mandibular plate wider than clypeus, with the outer margin convex and the inner margin concave anterior to clypeus; apex of mandibular plates acute; antennomeres I not surpassing the mandibular plates, proportion of antennomeres: I ≅ II<III<IV<V (Fig. 11, A); labium not surpassing half of metasternum, without intercalary segment (Fig. 11, B); proportion of labiomeres: I<II>III>IV.

Thorax. Pronotum twice as wide as long; anterior and lateral margins shallowly concave (Fig. 11, A). Lateral half of the corial posterior margin concave, apical angle almost attaining the middle of connexival segment VI (Fig. 10, A). Metasternum transversely arched. Peritremal anterior margin sinuous (Fig. 11, C).

Abdomen. Medial portion of urosternites unpunctured (Fig. 10, B); inner trichobothria aligned with the outer margin of spiracles in urosternites V and VI; outer trichobothria lateral to spiracles.

Male. Measurements (n=1): Total length 12.30; width of abdomen 6.40; head length 2.00; width 2.50; pronotum length 2.60; width 6.10; scutellum length 4.20; width 3.60; length of antennomeres: I 0.70, II 0.70, III 1.30, IV 1.60, V 2.10; length of labiomeres: I 1.00, Int. 0.10, II 1.30, III 1.00, IV 0.90.

Genitalia (Figs. 12, 13). Pygophore. Lateral margins diverging towards the posterolateral angles, slightly convex (Fig. 12. A, E); dorsal wall length on midline subequal to the length of segment X; dorsal rim concave over segment X (Fig. 12. A); posterolateral angles narrowly rounded, dorsally excavated with lateral margins convex, and posteriorly exceeding the segment X for 2/3 the latter’s length (Fig. 12. A, B); ventral rim u-shaped, slightly sinuous, lined with setae (Fig. 12. E). Segment X with dense setae along the broad ogival posterior margin; slightly projected posteriorly on middle (Fig. 12, A–C, F). Parameres laterally sinuous; dish-shaped process with an apical tuft of thin setae; apical branches of the parameres’ head diverging, external branch slightly twisted and little longer than the internal (Fig. 12, A, B; 13, D–F). Phallus. Proximal thecal width 1/3 of the maximum thecal width in lateral view (Fig. 13, A); apical lobes of the dorsal process of endosoma weakly dilated and rounded, margins of the emargination juxtaposed (Fig. 13, A–C).

Female. Measurements (n=2): Total length 13.20 ± 0.42 (13.50–12.90); width of abdomen 6.45 ± 0.07 (6.50– 6.40); head length 1.50 ± 0.14 (1.60–1.40); width 2.60 ± 0.14 (2.70–2.50); pronotum length 2.55 ± 0.07 (2.60–2.50); width 6.20 ± 0.14 (6.30–6.10); scutellum length 4.95 ± 0.07 (5.00–4.90); width 3.85 ± 0.21 (4.00–3.70); length of antennomeres: I 0.90 ± 0.14 (1.00–0.80), II 0.80 ± 0.00 (0.80–0.80), III 1.15 ± 0.07 (1.20–1.10), IV 1.45 ± 0.07 (1.50–1.40), V 2.05 ± 0.07 (2.10–2.00); length of labiomeres: I 0.90 ± 0.00 (0.90–0.90), Int. 0.15 ± 0.07 (0.20-0.10) II 1.35 ± 0.07 (1.40–1.30), III 1.15 ± 0.07 (1.20–1.10), IV 0.80 ± 0.00 (0.80–0.80).

Genitalia. (Fig 14). Valvifers VIII longer than wide, lateral angles posteriorly projected relative to the sutural angles, posterior margins convex (Fig. 14, A, vfVIII); laterotergites VIII wider than long, posterior margins slightly arched (Fig. 14, A, laVIII); laterotergites IX with lateral margins straight, mesial margins convex, and rounded apices, not surpassing mediotergite VIII (Fig. 14, A, laIX). Thickening of the vaginal intima subrectangular in ventral view; ring sclerites subtriangular in ventral view, twice wider than the thickening of the vaginal intima (Fig. 14, B); proximal portion of ductus receptaculi coiled, more than twice longer than the vesicular area (Fig. 14, B, drp); median duct of vesicular area uniformly wide through its length; distal portion of ductus receptaculi dilated towards the pars intermedialis, about twice longer than pars intermedialis and capsula seminalis taken together (Fig. 14, B, drd); pars intermedialis 1.3 times longer than capsula seminalis, this with three digitiform projections (Fig. 14, B, pi, cs).

Comments. Similar to Janeirona bergi, Janeirona roellae Sampaio & Campos sp. nov., and Janeirona flavipes Sampaio & Campos sp. nov.. Differs from J. bergi by the smaller size, antennomeres I not surpassing the mandibular plates, pronotal lateral margins distinctly depressed dorsally, metasternum transversely arched, and pygophore posterolateral angles with rounded apices. Differs from Janeirona roellae Sampaio & Campos sp. nov. by the maximum head width across the mandibular plates less than half the head width across the eyes, posterior margins of the eyes forming an angle of less than 45º with the longitudinal body axis, and labium not surpassing the middle of the metasternum. Differs from Janeirona flavipes Sampaio & Campos sp. nov. by the brown legs, not contrasting with color of the abdominal venter, and the slightly twisted external branch of the head of parameres.

Distribution: Brazil (Minas Gerais and São Paulo).