Pristonesia uvenil 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 : 333-336

Pristonesia uvenil Azevedo & Colombo , sp. nov.

Figs 3A–C , 5G–I

Diagnosis. This species differs from the others of the genus by having the base of digitus with sharp angulation, almost spine-shaped and the aedeagal apodeme without ergot.

Description. Male. Body 3.2–3.3 mm long. Forewing 2.1–2.2 mm long.Antenna 1.4–1.5 mm long. Color. Head and mesosoma black, posterior area of prothorax dark castaneous; clypeus dark castaneous; antenna castaneous; palpi castaneous; mandible castaneous, darker basally; legs somewhat dark castaneous, trochanters, tibiae and tarsi lighter; metasoma dark castaneous; wings hyaline, veins castaneous, pterostigma darker.

Head. Subheptagonal, much longer than wide. Mandible with four teeth, two ventral most sharpened and larger, otherwise rounded and short, progressively increasing in length ventrad. Clypeus with median lobe angulate, but margins slightly outcurved; median carina complete, somewhat high and somewhat outcurved in lateral. Antenna with dense suberect pubescence, longer than half flagellomeral diameter, with some outstanding erect setae on flagellomeres III–IX; first four antennomeres in a ratio of about 12:4:7:7. Vertex crest mostly straight. Temple evenly little outcurved, progressively divergent anterad. Antennal rim slightly longer than wide, inter-torular space about 1.5 × torular diameter. Frons polished, with very few conspicuous and small punctures. Ocellar triangle with frontal angle about right, anterior margin of anterior ocellus touching supra-ocular line. Occipital carina partially visible on dorsal view.

Mesosoma . Dorsal pronotal area polished with some irregularly sized punctures, about as long as anteromesoscutum, posterior area wider than anterior one, surface slightly depressed anterad, transverse pronotal carina crossing all anterior border, ill-defined and slightly arched; cervical pronotal area short, mostly vertical, polished. Notauli well impressed, almost reaching both anterior and posterior margins of anteromesoscutum, straight, almost evenly wide, very converging posterad. Parapsidal signums well impressed, but missing anteriorly, almost straight, almost parallel. Mesoscutum-mesoscutellar sulcus with anterior margin incurved posterad, posterior margin angularly arched anterad medially, very narrower medially. Metascutellum polished, lateral margin poorly incurved, surface excavated posteriorly, metascutellar foveae fused, anterior margin straight and posterior one irregular, metanotal fovea trapezoidal, carinae of metanotal trough somewhat evident. Metapectal-propodeal disc striate-rugulose, 1.1–1.2 × as long as wide, metapostnotal median defined by borders of striation, lateral marginal carina weak, delimited only anterior, transverse posterior carina absent. Propodeal declivity mostly rugulose. Lateral surface of metapectal-propodeal complex mostly foveolate-rugulose, except weakly strigulate on extreme anterior. Mesopleuron foveolate on polished background, callus contrastingly smooth, posterior oblique sulcus subvertical, arched, wide, short. Mesodiscrimen with surface poorly concave anteriorly. Metasternum with somewhat high posterior margin and with median pair of dentiform projection, with median longitudinal carina.

Wings and legs. Forewing with poststigmal abscissa of radial 1 about one third length of pterostigma, 2r-rs&Rs evenly arched, and not notched where 2r-rs sector connects to Rs sector; anterior medial and posterior medial 1 flexions lines long, m-cu flexion line straight, claval flexion line weak, r-m flexion line arched. Hind wing with two basal hamuli, and four equidistant distal hamuli. Claws simple, but with tiny median callus, tooth 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 so that its lateral margins almost touch each other ventrally, posterior margin almost straight, without median emargination, not excavated where epipygium folds ventrad. Hypopygium with spiculum long and tip sharp, anteromedial apodeme absent, anterolateral apodeme progressively narrowing apicad into sharp arched mesad tip, anterior margin almost straight medially, posterior margin roundly excavated forming two round lobes without any spine, excavation about one fourth as long as hypopygeal plate, thick median area of inner surface large and slightly progressively narrowing anterad only on anterior third.

Genitalia. Harpe with apical margin with two conical expansions, dorsal one longer than ventral one, dorsal margin evenly incurved, wide basally, ventral poorly straight; inner margin of ventral side of gonostipes with rounded median callus, and with few medioapical setae; apical basivolsellar expansion absent; cuspis angled apically, very wide basally, cross-section flat, outer surface convex and smooth, apex sharp, without any membranous extension; digitus cross-section cylindrical, strongly angled and projected basally, otherwise straight, apex squamate and not membranous, base with spine anterad; aedeagus bulging medially in dorsal profile, ventral valve membranous, short, apex aligned with base of cuspis, progressively narrowing apicad, apex sub-blunt, dorsal valve much longer ventral one, its apical membranous extension as long as wide, cat whisker-shaped set of setae long and sparse; aedeagal apodeme arched mesad, ergot tiny; genital ring strongly incurved ventrally.

Material examined. Holotype, ♂, Gabon, Prov. Ogooué-Maritime, Réserve des Monts Doudou , 24.3km 307º NW Doussala, 2º13.35’S 10º24.35’E, 370m, 9.iii.2000, S. van Noort, Sweep, GA 00-S74, Lowland Rainforest, undergrowth, low canopy in forest, SAM-HYM-P0024208 ( SAMC) . Paratype, 1♂, Gabon, same data as holotype, except 16.iii.2000, GA00-S116, SAM-HYM-P0024216 ( SAMC) .

Distribution. Gabon.

Figures

FIGURE 3. A–C. Pristonesia uvenil sp. nov.. A. Habitus, lateral view; B. Head, dorsal view; C. 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.