Pristonesia tainatril Azevedo & Colombo, 2022

Azevedo, Celso O. & Colombo, Wesley D., 2022, Revision of Pristonesia (Hymenoptera, Bethylidae, Pristocerinae), an endemic Afrotropical genus, Zootaxa 5124 (3), pp. 321-340 : 331-332

Pristonesia tainatril Azevedo & Colombo , sp. nov.

Figs 2G–I , 5D–F

Diagnosis. This species differs from the others of the genus by having the posterior hypopygeal margin forming two rounded lobes and the harpe with wide conical apical projection.

Description. Male. Body 4.5–6.0 mm long. Forewing 3.2–3.5 mm long.Antenna 1.7–2.0 mm long. Color. Head and mesosoma black; clypeus dark castaneous; antenna castaneous; palpi castaneous; mandible dark castaneous with all margins darker; legs dark castaneous with trochanters, tibiae and tarsi lighter; metasoma dark castaneous; wings hyaline, veins castaneous to dark castaneous, pterostigma darker.

Head. Rectangular, much longer than wide. Mandible with three sharpened teeth, ventral most and dorsal most ones equally large, median one well-spaced of dorsal most. Clypeus with median lobe angulate; median carina complete, somewhat high and almost straight in lateral. Antenna with dense suberect pubescence, about as long as half flagellomeral diameter, with some outstanding erect setae on all flagellomeres; first four antennomeres in a ratio of about 15:6:7:8. Vertex crest mostly almost straight, but poorly incurved medially. Temple evenly outcurved, progressively divergent anterad.Antennal rim about as long as wide, inter-torular space almost 2.0 × torular diameter. Frons polished, with few conspicuous and small punctures. Ocellar triangle with frontal angle about right, anterior ocellus crossing supra-ocular line. Occipital carina hardly visible on dorsal view.

Mesosoma . Dorsal pronotal area with large dense punctures, polished medially longer than anteromesoscutum, posterior area much wider than anterior one, surface not depressed anterad, transverse pronotal carina crossing all anterior border, well-defined and slightly arched; cervical pronotal area somewhat high, vertical and polished ventrally, subvertical and coriaceous dorsally. Notauli well impressed, reaching anterior margin of anteromesoscutum and not reaching posterior one, straight, clearly widening posterad, slightly converging posterad. Parapsidal signums well impressed, but missing anteriorly, almost straight, parallel. Mesoscutum-mesoscutellar sulcus with anterior margin straight, posterior margin angularly arched anterad medially, narrower medially. Metascutellum polished, lateral margin poorly incurved, surface excavated posteriorly, metascutellar foveae fused, anterior margin straight and posterior one irregular, metanotal fovea rectangular-triangular, carinae of metanotal trough conspicuous. Metapectal-propodeal disc rugulose, 1.1–1.2 × as long as wide, metapostnotal median complete, lateral marginal carina undefined, transverse posterior carina absent. Propodeal declivity rugulose with large punctures foveolateshaped. Lateral surface of metapectal-propodeal complex rugulose. Mesopleuron foveolate on polished background, callus contrastingly smooth, posterior oblique sulcus subvertical, short, undefined. Mesodiscrimen with surface concave. Metasternum with somewhat high posterior margin and with median pair of dentiform projection, without median carina.

Wings and legs. Forewing with poststigmal abscissa of radial 1 about one third length of pterostigma, 2r-rs&Rs vein slightly arched, and slightly notched where 2r-rs sector connects to Rs sector; anterior medial flexion line long and posterior medial 1 flexion line very short, m-cu flexion line straight, claval flexion line weak, r-m flexion line almost straight. Hind wing with three equidistant basal hamuli, and five equidistant distal hamuli. Claws bifid, basal tooth small, apical sharp and curved.

Metasoma. Opening of spiracle of metasomal segment I elliptical and subdorsal. Tergum I conspicuously longer than tergum II. Sternum II longitudinally bicarinate, carinae diverging posterad. Epipygium wide apically, but its lateral margins do touch each other ventrally, posterior margin poorly outcurved and more projected than ventral margins, without median emargination, not excavated where epipygium folds ventrad. Hypopygium with spiculum long and poorly dilated, anteromedial apodeme absent, anterolateral apodeme thick, but progressively narrowing apicad into sharp not arched tip, anterior margin almost straight medially, posterior margin strongly roundly excavated forming two lobes without any spine, excavation about two thirds as long as hypopygeal plate, thick median area of inner surface large and conspicuously progressively narrowing anterad.

Genitalia. Harpe triangular apically, dorsal margin evenly strongly incurved, slightly wide basally, ventral slightly incurved; inner margin of ventral side of gonostipes with inconspicuous rounded median callus, and with few medioapical setae; apical basivolsellar expansion short and subconical; cuspis evenly smoothly arched, very wide basally progressively narrowing apicad, cross-section flat, apex narrowly rounded; digitus cross-section subcylindrical, evenly arched, apex squamate and somewhat membranous; aedeagus cylindrical in dorsal profile, ventral valve membranous, not so short, apex posterior to base of cuspis, apex rounded, dorsal valve much longer ventral one, its apical membranous extension longer than wide, cat whisker-shaped set of setae not so long and somewhat dense; aedeagal apodeme arched mesad, ergot short and rounded; genital ring subrectangular.

Material examined. Holotype, ♂, Central African Republic, Prefecture Sangha-Mbaéré, Parc National de Dzanga-Ndoki, Mabéa Bai , 21.4km 53º NE Bayanga, 3º02.01’N 16º24.57’E, 510m, 5-6.v.2001, S. van Noort, Malaise trap, CAR01-M45, Lowland Rainforest, marsh clearing, ( SAMC) . Paratype, 1♂, Central African Republic, same data as holotype, except 1-2.v.2001, CAR01-M10 ( SAMC) .

Distribution. Central African Republic.

Figures

FIGURE 2. A–C. Pristonesia querfil sp. nov.; D–F. Pristonesia sicril sp. nov.; G–I. Pristonesia tainatril sp. nov.. A, D, G. Habitus, lateral view; B, E, H. Head, dorsal view; C, F, I. Mesosoma, dorsal view. Scale bars = 100 µm.

FIGURE 5. A–C. Pristonesia sicril sp. nov.; D–F. Pristonesia tainatril sp. nov.; G–I. Pristonesia uvenil sp. nov.. A, D, G. Hypopygium, external view; B, E, H. Genitalia, dorsal view; C, F, I. Genitalia, ventral view. Black = cupula; dark grey = ventral valvae; light grey = apical membranous bubble. Scale bars = 100 µm.