Ormiophasia buoculus,

Gudin, Filipe M. & Nihei, Silvio S., 2019, Taxonomic revision of the Neotropical genus Ormiophasia Townsend, 1919 (Diptera: Tachinidae), with the description of eight new species, Zootaxa 4643 (1), pp. 1-74: 63-65

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Ormiophasia buoculus

sp. nov.

Ormiophasia buoculus  sp. nov.

( Figs 6GView FIGURE 6, 10GView FIGURE 10, 12GView FIGURE 12, 37A, C, E, GView FIGURE 37, 42BView FIGURE 42)

Type material. HOLOTYPE ♂ ( Figs 6GView FIGURE 6, 10GView FIGURE 10, 12GView FIGURE 12, 37A, C, GView FIGURE 37): “ Venezuela: T. F. Amaz. / Cerro de la Neblina / Basecamp. 0 o 50’ N / 66º 9’ 44” W. 155 m / Canopy, 23–29Feb.1984 / D. Davis & T. McCabe [leg.]”/ “ Holotype ” [red label] ( USNM).GoogleMaps 

PARATYPES (3 ♂♂): Venezuela: 2 ♂♂ [one dissected, one photographed] ( Fig. 37EView FIGURE 37): “ Venezuela, T. F. Amaz. / Cerro de la Neblina/ Basecamp, 0 o 50’N / 66º9’44”W, 155 m / Canopy 23–29Feb.1984 [23–29.ii.1984]/ D. Davis & T. McCabe [leg.]”/ “ Paratype ” [green label] ( USNM); 1 ♂ [dissected]: “ Venezuela, Bolívar / carret. Caicara, San / Juan de Manapiare / Km 170, 300 m / 21–30.xii.1973 ”/ “ Ormia  [handwriting]”/ “ Paratype ” [green label] ( MIZA)GoogleMaps  .

Type locality. Venezuela, Amazonas, Cerro de la Neblina.

Distribution. Venezuela (states of Amazonas and Bolívar).

Etymology. The name refers to the conspicuous size of the dorsal ommatidia of the male, from the Latin “ bu ” = large and “ oculus ” = eye.

Diagnosis. Ormiophasia buoculus  sp. nov. can be distinguished from other species of Ormiophasia  by head with silver pruinosity ( Fig. 6GView FIGURE 6); ocelli smaller than dorsal ommatidia ( Fig. 37CView FIGURE 37); clypeus darker than frontoclypeal membrane; thorax and abdomen dark brown ( Figs 10GView FIGURE 10, 12GView FIGURE 12); wing with strong infuscation around veins R 1 and R 2+3 and weak infuscation around veins M 1 and dm-cu ( Fig. 37GView FIGURE 37); and apex of male cerci about 1/3 length of cerci ( Fig. 42BView FIGURE 42), rounded in posterior view and 2/5 width of cerci, gradually constricted. Ormiophasia buoculus  sp. nov. is very similar to O. morardi  , from which it is distinguishable only in the male sex. Males of O. buoculus  sp. nov. have a very constricted ocellar triangle, not visible in profile ( Fig. 37AView FIGURE 37), and ocelli smaller than the dorsal ommatidia (37C), whereas males of O. morardi  have ocellar triangle visible in profile ( Fig. 28AView FIGURE 28) and ocelli 1.5 times the size of the dorsal ommatidia ( Fig. 28CView FIGURE 28). The distinct male head of O. buoculus  sp. nov. resembles that of O. townsendi  sp. nov., but this last species differs by its lighter body color ( Figs 10HView FIGURE 10, 12HView FIGURE 12) and completely different shape of the cerci and surstylus ( Fig. 42CView FIGURE 42).

Description. Male. Body length 7.12–7.34 mm (mean = 7.26 mm); wing length 7.40–8.24 mm (7.94 mm) (n = 3).

Coloration. Head silver-pruinose ( Fig. 6GView FIGURE 6). Frontal vitta dark brown. Ocellar triangle black. Fronto-orbital plate gray. Lunule yellowish-gray. Antenna yellowish-orange to brownish-orange. Parafacial gray. Gena, facial ridge and face brownish-gray. Mouthparts brown except clypeus (dark brown). Occiput dark brown in upper area, becoming light brown in lower area. Thorax silver-pruinose ( Figs 10GView FIGURE 10, 12GView FIGURE 12). Scutum dark brown; presutural scutum with three silver-pruinose stripes merged posteriorly after suture. Postpronotal lobe and lateral surface of thorax dark brown. Scutellum and subscutellum dark brown. 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. 37GView FIGURE 37). Tegula dark brown. Basicosta light brown. Veins dark brown. Halter light brown. Calypteres brown. Legs dark brown. Abdomen entirely dark brown with silver pruinosity.

Head ( Figs 6GView FIGURE 6, 37A, CView FIGURE 37). Elliptic in frontal view; ratio of head height/head width 0.80. Ocelli smaller than dorsal ommatidia. Postocellar setae 2. Frontal vitta entirely obliterated. Frontal setae 6–7, convergent, posterior ones shorter and weaker. Arista weakly plumose. First flagellomere 2.1 times longer than pedicel. Face 1.5 times wider than facial ridge. Facial ridge 2.9 times wider than parafacial.

Thorax. Basisternum 0.52 times as high as wide ( Fig. 37EView FIGURE 37); median upper margin rounded, subtriangular. Prosternal tympanal membrane 0.83 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 7–8 setae. Meral setae 7–8. Wing. Subequal to body length, 2.6 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 9–11 dorsal setae from base to apex and row of 10–15 posteroventral setae from base to apex. Fore tibia with row of 4 equally-spaced anterodorsal setae and 1 preapical seta. Mid femur with 2–3 posteroventral basal setae. Hind femur with row of 11–15 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. 42CView FIGURE 42). Sternite 5 subrectangular; lateral distal lobes pronounced. Anteroventral epandrial process continuous with ventral epandrial margin. Dorsal surface of epandrium short, posterior margin higher than anterior margin; lateral ventral margin sharply curved; posterior area articulated to surstylus with closed, rounded arch. Surstylus stout, thicker than apex of cerci in lateral view; posterior outer surface covered with strong 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 pointed in lateral view; apex 2/5 width of cerci in posterior view, gradually constricted; apex with anterior surface U-shaped. Postgonite slightly curved, apex tapered in lateral view.

Female. Unknown.

Remarks. For comments on similarities and differences between O. buoculus  sp. nov. and O. morardi  , see Remarks under O. morardi  . Ormiophasia buoculus  sp. nov. and O. townsendi  sp. nov. are very different from other Ormiophasia  species in the shape of the male head, with a very constricted ocellar triangle not visible in profile ( Fig. 37View FIGURE 37 A–B) and ocelli smaller than the dorsal ommatidia (37C–D). Ormiophasia buoculus  sp. nov. seems to be restricted to Venezuela.


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