Mberu altamiro sp. nov.

(Figs 1, 2)

Description. Male. Body length: 2.23 mm. Wing length: 2.24 mm long, 0.57 mm wide (n = 1). Body mostly dark brown to black, with metallic reflections. Head (Fig. 1B, C, D). Frons width 0.3 times head width, at narrowest part; eyes almost touching on face, narrowest distance in middle of face less than diameter of anterior ocellus; face slightly wider at ventral and dorsal ends, with silver pruinosity ventral to antenna, darker in middle, lower part of face and clypeus with dense silver pruinosity; palpus dark brown, with 2–3 apical setulae; proboscis dark brown, with short whitish hairs; one proclinate convergent vt s; one reclinate divergent oc s, as long as vt s; one reclinate convergent poc s, 0.4 times as long as vt s; occiput distinctly concave above, shiny dark brown; lower surface of occiput covered by complete row of white pocl s, increasing in size ventrally, ventralmost sparse and straight, as long as vt s; lower occiput covered by some white, straight ocp s, increasing in size ventrally, 1.3 times as long as lower pocl s (Fig. 1B, C, D). Scape short, yellow, dorsal surface bare; pedicel yellow with dorsal surface dark brown, with crown of dark apical setae; postpedicel dark brown, triangular, about 1.5 times longer than basal width, pubescent; stylus about 5 times longer than postpedicel, dorsally inserted, bare, displaced laterally, bi-articulated at base. Thorax. Dark brown to black, with some dark green reflections, 0.7 times as long as abdomen, posterior slope of mesonotum distinctly flattened, postpronotal lobe with lower pale spot. Short scattered setae from anterior side of mesonotum to slightly beyond transverse suture; two rows of 13–15 small acr s, ending at mesonotal slope; 6 dc s, increasing in size posteriorly, posterior two conspicuously longer; 1 psut ial s, 1 presut spal s, 2 large psut spal s; 2 pprn s, one strong and one tiny white seta; 2 npl s, 2 pal s, one large and one setula anteriad; 1 pair of strong l sctl s and 1 pair of smaller laterad setae, about half as long as l sctl s; 2 white prepst s. Wing (Fig. 1F). Membrane light brown, with darker brown spot below wing apex; veins brown. C ending before wing apex, only slightly extended beyond M 1; Sc ending at middle of R 1; R 1 ending at about basal third of wing; R 2+3 and R 4+5 strongly displaced towards anterior margin as compared to R 1; anterior cells strongly compressed, R 2+3 ending in C at apical fourth of wing; R 4+5 and M 1 convergent near wing margin; M 4 complete, reaching wing margin; CuA+CuP strong, not reaching wing margin. Lower calypter, halter and cilia white. RMx ratio = 1.7, CuAx ratio = 0.3. Legs. Mostly brown, yellow at apex of femur II, base of tibia II, apex of femur III, middle of tibia III, basal half of IIIt1; pair of claws present on all legs. Pulvilli small. Leg I (Fig. 1D). Coxa I covered with white, fine setae (shorter than coxa I width), decreasing in length towards apex, apex with 3–4 strong, pale apical setae anteriorly. Femur I with 4–5 small, pale pv setae at base, with anterior bush-like comb of brown setae (e.g. Fig. 7B). Tibia I covered by fine setae, longer dorsally. It1 with ventral surface entirely bare (e.g. Fig. 5F), dorsal surface covered by dark setae; It1 longer than remaining tarsomeres combined (Fig. 1D). Leg II. Coxa II with a few pale setulae anteriorly, bare laterally. Femur II (Fig. 1E) with ad row of small, inconspicuous brown setae along apical third, increasing in length towards apex; ventral surface bare, except for anteroventral row of 7–8 sparse, pale setae along basal 3/4, decreasing in length towards apex, and one sinuous, brown av seta (e.g. Fig. 4D). Tibia II with row of dark, erect dorsal setae (Fig. 1E). Leg III. Coxa III with one conspicuous, long, pale seta near base and one setula above. Femur III with dorsal row of dark setae, decreasing in length towards apex. Tibia III with one dorsal brown seta at distal 1/4, followed by one row of dark, dorsal setulae apically; comb of pale, apical setae, projecting towards to tarsal excavation. IIIt1 ventrally excavated at base. Relative podomere ratios: I: 14.7/ 11.5/ 6.2/ 1.3/ 1/ 1/ 1.2; II: 23.4/ 23.8/ 11.6/ 1/ 1/ 1.4/ 2; III: 13.1/ 13.9/ 5.3/ 3.6/ 1.6/ 1/ 1. Abdomen. Mostly dark brown, with some dark blue to green reflections on tergites 4–5. Tergites 1–5 with short, black setae. Segment 6 partially hidden under tergite 5, tergite 6 bare; segment 7 forming short peduncle, tergite and sternite 7 bare; sternite 8 small, triangular. Sternites 1–3 visible, sclerotized, light brown, sternite 4 membranous. Hypopygium (Fig. 2). Epandrium elongate, 1.3 times as long as high, dark (Fig. 2B). MEp elongate, about 7.5 times as long as wide (Fig. 2G). DSur and VSur covering internal appendages (Fig. 2B); VSur (Fig. 2C) enlarged, twice higher than DSur (Fig. 2D), with two inner apicoventral setae, probably LEp fused with VSur (see Quevedo et al. 2025); DSur (Fig. 2D) irregular and robust, with curved ventral margins and truncated, rounded distal lobe. Hypandrium basally fused to epandrium. Phallus with short, dorsal projection near apex (Fig. 2F). Cercus (Fig. 2H) divided in two parts, ventral part curved and stout, with 3–4 spines ventrally, dorsal part rounded and covered by fine setae, with digitiform projection apically.

Female. Unknown.

Type material. HOLOTYPE ♂, “ BRAZIL, GO [Goiás], Goianápolis | Parque Estadual [State Park] Altamiro de Moura | Pacheco-PEAMP | Malaise mata [Seasonal Semi-deciduous Forest], margem do córrego [stream bank] | Carapina – Trilha da Onça | -16.534879, -49.113812 [16°32′05.6″S 49°06′49.7″W] - 790m | 29.vi.2022 - 02.viii.2022 | Cols. Oliveira, S.S. & Lopes, W.R. ”, “HOLOTYPE | Mberu altamiro | Silva, Capellari & Oliveira [red label]” (MZUSP) . Holotype in good condition, genitalia dissected and stored in microvial with glycerin, pinned beneath the specimen; left wing mounted in permanent slide, glued to paper triangle and pinned beneath specimen.

4+5

Etymology. Toponymic, referring to the type-locality and treated as a noun in apposition.

Remarks. Mberu altamiro sp. nov. can be distinguished from the other species of the pepocatu group (those with vein M 1 converging with R 4+5 at costa) by the absence of elongated ventral pocl s and ocp s (Fig. 1B, C), which in the other species are as long as the vt s (Figs 3B, C) and by the lack of long anterior basal setae on coxa I (Fig. 1D). Additionally, M. altamiro sp. nov. has a light brown wing membrane with a dark brown spot below the wing apex, and it lacks spurious veins on the wings (Fig. 1F). Furthermore, the rows of setae on femur II and tibia II are less developed than in the other species that exhibit these structures (Fig. 1E).

Distribution (Fig. 24). Brazil: state of Goiás (Cerrado biome).