Paratibraca rideri Barros, Barão & Grazia, 2022

Paratibraca rideri Barros, Barão & Grazia sp. nov.

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Fig. 2 A-K

Type material. Holotype: ♀, Brazil, Pará, Santarém , 17-26.I.2016, D. Maggio leg., ( INPA). Paratypes: 3 ♀ ( UFRG) 1 ♁ ( INPA), same data as holotype .

Etymology. This species is dedicated to David Rider in recognition of his great contribution to the knowledge of heteropteran systematics.

Diagnosis. Relatively larger than other congeners (see Measurements), general body color light brown dorsally and dark brown ventrally, humeral angles produced and rounded apically, the pygophore trapezoidal, with posterolateral angles rounded, opening of genital cup broad, and inferior layer produced, the posterior margins of valviferes 9 convex and laterotergites 9 longer than valvifers 8.

Description. General colour light brown dorsally; ventral surface dark brown; body densely punctate with dark punctures. Ocelli red. Antennomere 4 and 5 mostly dark brown. Callosity of radial vein concolor with surface of hemelytra. Pro, meso, metasternum and evaporatorium dark-brown; peritreme of ESES light brown. Legs light brown, with dark spots. Body oval. Dorsal and ventral surface of body convex ( Fig. 2 C). Head longer than wide ( Fig. 2 D). Mandibular plates rounded apically, shorter than clypeus; outer margins of mandibular plates sinuous and lower than inner margins. Clypeus narrower basally than apically, apex obtuse; clypeus in a higher level than mandibular plates in lateral view; clypeal suture beginning after an imaginary line crossing anterior margin of compound eyes. Antenniferous tubercles visibles in dorsal view, each with an obtuse process laterally. Proportions of antennomeres: 1> 2 <3> 4 <5. Antennomere 1 not reaching apex of head; antennomere 3 cylindrical; antennomere 4 conical, slightly flattened dorsally, slightly grooved dorsally. Bucculae rectilinear, tapering toward base of the head, not reaching its base. Labium reaching abdominal sternite 3 medially ( Fig. 2 B). First labiomere contained between bucculae. Pronotum trapezoidal; each anterior angle of pronotum with an obtuse process directed laterally; anterolateral margins of pronotum concave, flat and smooth; humeral angles produced, rounded apically;posterolateral margins of pronotum sinuous; posterior margin of pronotum slightly convex ( Fig. 2 D). Mesosternal carina slightly elevated and smooth. Metasternum with a shallow groove. Ostiole of ESES elliptical, opening posterolaterally; periostiolar depression present; each ostiolar peritreme spout-shaped, long, occupying half of the distance to lateral margin of evaporatorium. Evaporatorium punctate, occupying more than half of the width of meso and metapleuron. Anterolateral margins of metapleural evaporatorium rounded. Evaporatorium on mesopleuron surpassing the limits of mesocoxal sutures, reaching its anterior and posterior lateral angles, and the outer margin ( Fig. 2 E). Metathoracic spiracle wide. Femora subequal than tibiae in length. Tarsi 3-segmented. Scutellum longer than wide ( Fig. 2 A); apex rounded, surpassing the posterior margin of the abdominal tergite 5. Basal angles of scutellum with foveae smaller than the diameter of a compound eye. Corium longer than scutellum, surpassing apices of abdominal tergite 5; apex of radial vein calloused; veins of membrane linear. Membranal suture sinuous. Apex of hemelytra not surpassing apex of body. Connexivum exposed ( Fig. 2 A). Posterolateral angles of sternites unarmed, straight. Callus mesial to each spiracle ( Fig. 2 C).

Male genitalia. ( Figs. 2 F-H). Genital cup of pygophore broad, opened dorsoposteriorly, and occupying more than half the length of pygophore. Middle region of dorsal rim entire, and extension of dorsal rim not produced ( Fig. 2 F). Layers of ventral rim not separated by a carina; area between layers depressed and striated ( Fig. 2 G). Superior layer of ventral rim projected over genital cup, developed laterally to segment X, covering parameres; lateral margins of superior layer of ventral rim entire, in caudal view; with a pair of superior processes. Inferior layer of ventral rim with a pair of processes ( Fig. 2 H). Segment X rectangular, not carinate, without processes. Parameres present, crown reduced. The male genitalia was not dissected because this species is represented by a single male specimen.

Female genitalia. Valvifers 8 flat, sub equal to valvifers 9 in length, partially covering valvifers 9, mesial margins juxtaposed, posterior margins sinuous. Valvulae 8 not visible externally ( Figs. 2 I-J). Valvifers 9 depressed, leveled to segment X, with esclerotized lateral arms attaining anterior margins of laterotergites 9, anterior margins straight, posterior margins convex. Laterotergites 9 surpassing abdominal tergite 8, mesial margins divergent, posterior margins obtusely projected. Valvulae 9 with 1+1 medially sclerotized areas ( Fig. 2 K). Ring sclerites elliptical. Arcuate posterior portion of thickening of vaginal intima longer than the round anterior portion. Median wall of vesicular area cylindrical subproximally. Proximal ductus receptaculi long in relation to length of vesicular area, twisted, and diameter equal and aspect straight into vesicular area. Distal ductus receptaculi short in relation to vesicular area, twisted. Annular flanges parallel to each other, diameter of anterior annular flange equal to pars intermedialis length and posterior annular flange wider than capsula seminalis. Pars intermedialis fanfolded. Capsula seminalis globose and shorter than the pars intermedialis ( Fig. 2 K).

Measurements (mean ± standard deviation, mm). Total length: 11.12 ± 2.32; Abdominal width: 6.96 ± 1.16; Head. length: 2.15 ± 0.13; width: 1.92 ± 0.07; Interocular distance: 1.10 ± 0.04; Clypeus length: 1.23 ± 0.03; Antennomeres. 1: 0.59 ± 0.04; 2: 0.47 ± 0.03; 3: 1.18 ± 0.04; 4: 0.86 ± 0.03; 5: 1.09 ± 0.03; Labiomeres. 1: 0.94 ± 0.12; 2: 1.57 ± 0.16; 3: 1.11 ± 0.03; 4: 0.85 ± 0.04; Pronotum. length: 2.35 ± 0.18; width: 5.53 ± 0.41; Scutellum. length: 3.69 ± 0.20; width: 3.80 ± 0.19.

Distribution. Brazil (Pará).

Comments. Paratibraca rideri sp. nov. and P. infuscata share similar dorsal facies, peritreme spout and long, anterolateral margins of metapleural evaporatorium rounded, dorsal rim of pygophore with marginal processes, inferior layer of ventral rim of pygophore with a pair of processes, segment X without processes, and the annular flanges wider and pars intermedialis fanfolded; in the other congeners the pars intermedialis is enlarged. The remarkable character shared by both species with P. dubia and P. spinosa is the distal ductus receptaculi twisted and short. P. rideri and P. amazonica can be easily distinguished because the latter is the smallest of the species and present the genitalic morphology of both sexes different from its congeners, such as: inferior layer of ventral rim of pygophore with one process; phallic characters; ductus receptaculi narrower, long and coiled in and out the vesicular area.