Ormiophasia townsendi Gudin & Nihei 2019, sp. nov.

Ormiophasia townsendi sp. nov.

(Figs 6H, 10H, 12H, 37B, D, F, H, 42C)

Type material. HOLOTYPE ♂ (Figs 6H, 10H, 12H, 37B, D, H): “ Brasil, AM, Ipixuna, Rio / Liberdade, Estirão da Preta / 7º 21’ 46.7” S– 71º 52’ 07.1”W / 14.v.2011. 04:00-06:30 h”/ “Arm. Luminosa baixa [light trap]/ J.A. Rafael, J.T. Câmara, R.F./ Silva, A. Somavilla, C./ Gonçalves, A. Agudelo, leg.”/ “ Holotype ” [red label] (INPA).

PARATYPES (2 ♂♂): Brazil: 1 ♂ [dissected, photographed] (Fig. 37F): “Brasil, Pará / Serra Norte / N-1 Canga / 29.i a 01.ii.1985 [29.i–1.ii.1985]”/ “ Armadilha Suspensa, 1–6 m [light trap, handwriting]”/ “MPEG DIP/ 12183349”/ “ Paratype ” [green label] (MPEG); 1 ♂ [dissected]: “ Brasil, PA [Pará], Abel Figueiredo / Faz. [Farm] Juca Mahre / 4º57’13”S / 48º23’36”W / 28.i–06.ii.2010 / Nihei et al. leg.”/ “ Paratype ” [green label] (MZSP).

Type locality. Brazil, Amazonas, Ipixuna.

Distribution. Brazil (states of Amazonas and Pará).

Etymology. The name is a tribute to the dipterist Charles Henry Tyler Townsend, who described the genus Ormiophasia. The name is a noun in the genitive case.

Diagnosis. Ormiophasia townsendi sp. nov. can be distinguished from other species of Ormiophasia by head with yellow pruinosity (Fig. 6H); ocelli smaller than dorsal ommatidia (Fig. 37D); clypeus of same color as frontoclypeal membrane; thorax and abdomen brownish-yellow (Fig. 10H, 12H); wing with strong infuscation around veins R 1 and R 2+3 and weak infuscation around veins M 1 and dm-cu (Fig. 37H); surstylus slender, with posterior outer surface covered with weak setae in upper two-thirds (Fig. 42C); and apex of male cerci about 1/3 length of cerci, rounded in posterior view and about 1/3 width of cerci, gradually constricted. Ormiophasia townsendi sp. nov. is very similar to O. seguyi sp. nov., from which it is distinguishable only in the male sex. Males of O. townsendi sp. nov. have a very constricted ocellar triangle, not visible in profile (Fig. 37B), and ocelli smaller than the dorsal ommatidia (Fig. 37D), whereas males of O. seguyi sp. nov. have ocellar triangle visible in profile (Fig. 32A) and ocelli twice the size of the dorsal ommatidia (Fig. 32C). Additionally, O. seguyi sp. nov. also has surstylus and male cerci stouter (Fig. 40C) than O. townsendi sp. nov. The distinct male head of O. townsendi sp. nov. resembles that of O. buoculus sp. nov., but this last species differs by its darker body color (Figs 10G, 12G) and completely different shape of the cerci and surstylus (Fig. 42B).

Description. Male. Body length 6.47–7.03 mm (mean = 6.77 mm); wing length 7.49–7.65 mm (7.55 mm) (n = 3).

Coloration. Head yellow-pruinose (Fig. 6H). Frontal vitta brown. Ocellar triangle black. Fronto-orbital plate and lunule brownish-yellow. Antenna yellowish-orange. Parafacial, gena, facial ridge, face and mouthparts brownish-yellow. Occiput brown in upper area, becoming brownish-yellow in lower area. Thorax silver-pruinose (Figs 10H, 12H). Scutum brownish-yellow; presutural scutum with three silver-pruinose stripes merged posteriorly after suture. Postpronotal lobe and lateral surface of thorax brownish-yellow. Scutellum and subscutellum brownish-yellow. Wing with strong brown infuscation around veins R 1 and R 2+3 and weak brown infuscation around veins M 1 and dm-cu (Fig. 37H). Tegula and basicosta brownish-yellow. Veins brown. Halter and calypteres brownish-yellow. Legs brownish-yellow. Abdomen entirely brownish-yellow with silver pruinosity.

Head (Figs 6H, 37B, D). Elliptic in frontal view; ratio of head height/head width 0.80. Ocelli smaller than dorsal ommatidia. Postocellar setae 1–2. Frontal vitta entirely obliterated. Frontal setae 6–7, convergent, posterior ones shorter and weaker. Arista weakly plumose. First flagellomere 3 times as long as pedicel. Face 1.24 times wider than facial ridge. Facial ridge 2.5 times wider than parafacial.

Thorax. Basisternum 0.46 times as high as wide (Fig. 37F); median upper margin rounded, subtriangular. Prosternal tympanal membrane 0.74 times as high as wide. Proepimeral setae 2, upcurved. Anterodorsal corner of anepisternum with 1 weak seta, about 1/2 length of first notopleural seta; posterior row with 8–9 setae. Meral setae 7–8. Wing. Subequal to body length, 3 times longer than wide. Basicosta subequal in width to tegula. Base of vein R 4+5 with 1–3 dorsal and 2–3 ventral setae. Section of vein M between crossvein dm-cu and M 1 straight. Legs. Fore femur with row of 10–11 dorsal setae from base to apex and row of 14–17 posteroventral setae from base to apex. Fore tibia with row of 2–3 equally-spaced anterodorsal setae and 1 preapical seta. Mid femur with 2–3 posteroventral basal setae. Hind femur with row of 13–15 anterodorsal setae from base to apex and 3–4 anteroventral basal setae. Hind tibia with 2 posterodorsal median setae and 1 preapical seta.

Terminalia (Fig. 42C). Sternite 5 subrectangular; lateral distal lobes weakly pronounced. Anteroventral epandrial process continuous with ventral epandrial margin. Dorsal surface of epandrium short, posterior margin higher than anterior margin; lateral ventral margin almost straight, not curved; posterior area articulated to surstylus with open, rounded arch. Surstylus slender, thicker than apex of cerci in lateral view; posterior outer surface covered with weak setae in upper two-thirds. Cerci: basal margin with distinct median projection; apex about 1/3 length of cerci, rounded in posterior view, narrow and tapered in lateral view; apex about 1/3 width of cerci in posterior view, gradually constricted; apex with anterior surface V-shaped. Postgonite slightly curved, apex tapered in lateral view.

Female. Unknown.

Remarks. Ormiophasia townsendi sp. nov. and O. seguyi sp. nov. are very similar (see Remarks under O. seguyi sp. nov.). Ormiophasia townsendi sp. nov. and O. buoculus sp. nov. are very different from other Ormiophasia species because of the shape of the male head, with a very constricted ocellar triangle not visible in profile (Fig. 37 A–B) and ocelli smaller than the dorsal ommatidia (37C–D). Ormiophasia townsendi sp. nov. seems to be restricted to the Amazon rainforest. As its distribution overlaps with those of O. costalimai and O. inflata and all three species share a similar body color, it is possible to confuse them at first sight. However, they can be clearly distinguished by head, wing and male terminalia characters.