Oromasiphya diamantina Toma & Pinheiro, 2025

Oromasiphya diamantina Toma & Pinheiro sp. nov.

( Figs. 1, 2 View FIGURES 1–8 , 15, 16 View FIGURES 9–16 , 17–19 View FIGURES 17–31 )

Diagnosis. Oromasiphya diamantina sp. nov. differs from the other species of the genus in having the following combination of features: head with general silver-gray pruinosity, thorax black in ground color with gray pruinosity, tergites 3 and 4 with a pair of discal setae, apex of distiphallus composed of a dorsal conical tube and a pair of ventral tubes without lateral flap-shaped expansion apically, apex of ventral tubes reaching approximately halfway up dorsal conical tube; apex of distiphallus about 0.65x of cercus length.

Description. Male. Body length: ca 8.30 mm, wing length: 7.60 mm.

Coloration. Head with general silvery-gray pruinosity; the anterior portion of ocellar triangle, upper portion of fronto-orbital and occiput, lower portion of facial ridge, and portion between parafacial and gena with slightly grayish brass pruinosity when viewed from certain angles; occiput with white hairs; frontal vitta dark brown with brassy pruinosity near ocellar triangle; scape orange-brown; apex of scape, pedicel, and basal portion of postpedicel orange; apical two-thirds of postpedicel brown; palpus orange-yellow; proboscis brown; thorax black in ground color with gray pruinosity; scutum with four black longitudinal stripes: two outside of the acrostichal rows, interrupted near level of first postsutural acrostichal setae, and two outside of the dorsocentral rows, the pre-sutural stripes subtriangular; lateral of thorax silvery gray pruinose; legs black with gray pruinosity; wing subhyaline; tegula and basicosta black; upper and lower calypters white; abdomen in dorsal view in ground color black, apical fifth of tergite 5 orange; lateral of syntergite 1+2, basal two-thirds of tergites 3 and 4 and basal one-third of tergite 5 irregular gray pruinose; apical portion of tergites 3, 4 and 5 slight brass pruinose viewed from certain angles.

Head. Vertex about 0.28x head width in dorsal view; outer vertical setae about 0.45x length of inner vertical setae; fronto-orbital plate with hairs descending near level of lower frontal seta; the lowest postocular setula at upper level of gena; pedicel about 0.47x length of postpedicel; scape about 0.40x length of pedicel; genal and subvibrissal setae about 0.44 length of vibrissa.

Legs. Mid tibia with two strong anterodorsal setae interspersed by smaller setae, three posterior setae, the proximal one shorter, and two ventral setae, the most distal ventral seta stronger.

Abdomen. Tergite 3 with one pair of lateral discal setae quite distinct from setula-like hairs; yellow patch of micro-hairs on the ventral side of tergite 5 and lacking on tergite 4.

Terminalia ( Figs. 17–19 View FIGURES 17–31 ). Segment 7 + 8 about 4.0x length of anterodorsal margin of epandrium; segment 7 +8 closely connected with epandrium; sternite 6 connected with inner portion of sternite 5, forming a horn-like structure; apical structure of the distiphallus with micro-spines, it is formed by a dorsal conical tube and a pair of ventral tubes curved; dorsal conical tube longer than wide, with a flap-shaped structure with an irregular border at its dorsal base; ventral tubes with a pair of sclerotized flaps at its ventral base; apex of ventral tubes reaching approximately halfway up dorsal conical tube; apex of distiphallus about 0.65x of cercus length.

Female terminalia ( Figs. 15–16 View FIGURES 9–16 ). Sternite 6 trapezoidal wider basally, with setulae increasing in size towards apex; tergite 6 formed by two hemitergites connected in the middle at the basal margin; the hemitergites narrowing laterally, a few median marginal setae present; each hemitergite bears a spiracle latero-ventrally; the intersegmental membrane posterior to the hemitergites bears on each side a spiracle more dorsally to the anterior spiracle; sternite 7 is long, folded up, fused at the posterior border, forming a case that encloses a short, downward curved piercing structure; the piercing structure partially sheathed by sternite 7 and carries a slightly less sclerotized triangular structure; the anterior margin of sternite 7 V-shaped; external surface of the sternite 7 covered with stiff tine setulae; tergite 7 narrow and connected with sternite 7 latero-ventrally, it is slightly more tapered on the sides, with an irregular posterior margin; cerci digitiform with setulae on posterior half; hypoproct V-shaped with setulae apically.

Geographic distribution. Brazil ( Minas Gerais: Diamantina).

Type material. Holotype male ( ZUFMS), labeled: “ Brasil: MG: Diamantina / fevereiro 2022/ Rodrigo Pinheiro ”; “ Oromasiphya diamantina / holotype [red label, species name handwritten]”.

Paratypes: One male ( MZUSP), labeled: idem; “ Oromasiphya diamantina / Paratype [red label, species name handwritten]” . Two females ( ZUFMS), labeled: idem; “ Oromasiphya diamantina / Paratype [red label, species name handwritten]” .

Etymology. The specific epithet is a noun in apposition, is from Diamantina, Minas Gerais state, Brazil.