Oromasiphya guimai Toma & Pinheiro, 2025

Oromasiphya guimai Toma & Pinheiro sp. nov.

( Figs. 3, 4 View FIGURES 1–8 , 20–22 View FIGURES 17–31 )

Diagnosis. Oromasiphya guimai sp. nov. can be distinguished from other species of the genus by lacking a pair of median discal setae on tergite 3.

Description. Male. Body length: 7.78–8.72 mm, wing length: 7.0– 7.32 mm.

Coloration. Head covered mostly with silver-gray pruinosity, but anterior edge of ocellar triangle and portion between reclinate orbital setae with faint yellowish gray pruinosity viewed from certain angles; occiput with white hairs; frontal vitta dark brown; scape, pedicel, and basal half of postpedicel orange; apical half of postpedicel brown; palpus yellow; proboscis brown; thorax dark brown 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 stripes outside of the dorsocentral rows, the presutural stripes subtriangular; lateral of thorax orange-brown in ground color with silver gray pruinosity; legs dark brown with gray pruinosity; wing subhyaline; tegula black and basicosta brown; upper and lower calypters whitish; abdomen, in dorsal view, brown in ground color, apical one third of tergite 5 orange, basal two thirds of tergite 3, 4 and 5 with irregular faint gray pruinosity, and apical portion of tergite 3 and 4 faint yellowish gray pruinose viewed from certain angles; ventral portion of syntergite 1+2, tergites 3 and 4 faint gray pruinose.

Head. Vertex about 0.26x head width in dorsal view; outer vertical setae about 0.39x length of inner vertical setae; fronto-orbital plate with hair descending near level of base of pedicel; the lowest postocular setula at upper level of gena; pedicel about 0.44x length of postpedicel; scape about 0.30x length of pedicel; genal subvibrissal setae about 0.47x length of vibrissa.

Legs. Mid tibia with three strong anterodorsal setae, the basal one stronger; three posterior setae, the proximal seta shorter; and one strong ventral seta.

Abdomen. Tergite 3 without a pair of median discal setae; yellow patch of micro-hairs on the ventral side of tergite 5 and lacking on tergite 4.

Terminalia ( Figs. 20–22 View FIGURES 17–31 ). Cercus in lateral view with anterior apical fifth slightly swelling; distiphallus relatively long; apex of distiphallus composed of a dorsal conical tube and a pair of ventral tubes; a flap-like structure at dorsal base of dorsal conical tube; ventral tubes with a pair of sclerotized flaps at its ventro-lateral base; ventral tubes ending approximately at level of apex of dorsal conical tube; dorsal conical tube as long as wide; apex of distiphallus about 0.40x of cercus length.

Female unknown.

Geographic distribution. Brazil ( Rio de Janeiro: Rio de Janeiro, Nova Iguaçu) .

Type material. Holotype male ( MZUSP), labeled: “ Grajahú / Rio de Janeiro / S. Lopes 20-8-[19]39”; “3551”; “ Oromasiphya guimai / holotype [red label, species name handwritten]”. The specimen was found dissected and identified as a potential new species, supposedly by Dr. Guimarães, who did not describe it. The terminalia structures studied were heavily diaphanized and softened.

Paratypes. One male ( MZUSP), labeled: “ Rio de Janeiro / Gavea 12-v-937/ H. Souza Lopes ”; “4414”; “ Oromasiphya guimai / paratype [red label, species name handwritten]” . One male ( MZUSP), labeled: “ Tingua / Est. do Rio / Lopes —17 vii.[19]40”; “3353”; “ Oromasiphya guimai / paratype [red label, species name handwritten]

Etymology. The specific epithet is a tribute to the memory of Dr. José Henrique Guimarães.