Ormiophasia seguyi,

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: 51-53

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Ormiophasia seguyi

sp. nov.

Ormiophasia seguyi  sp. nov.

( Figures 6BView FIGURE 6, 8AView FIGURE 8, 10BView FIGURE 10, 12BView FIGURE 12, 14AView FIGURE 14, 32View FIGURE 32, 40CView FIGURE 40)

Type material. HOLOTYPE ♂ ( Figs 6BView FIGURE 6, 10BView FIGURE 10, 12BView FIGURE 12, 32A, C, GView FIGURE 32): “ Avispas [Avispa, misspelling], Madre / de Dios [but it may be the department of Cusco, see remarks], Peru / 20–30.ix.1962 / L. Pena [leg.], 400m ”/ “ Holotype ” [red label] ( CNC). 

PARATYPES (1 ♂, 4 ♀♀): Bolivia: 1 ♀: “ Bolivia, El Limbo / 65 o 36’W 17º07’S / 2200 m, Nov. 63 [xi.1963]/ F. Steinbach [leg.]”/ “ Paratype ” [green label] ( CNC)GoogleMaps  . Peru: 1 ♂ [dissected, photographed] ( Fig. 32EView FIGURE 32); 3 ♀♀ [one dissected, one photographed] ( Figs 8AView FIGURE 8, 14AView FIGURE 14, 32B, D, FView FIGURE 32): “Quincemil/ Cuzco, Peru / 13–31.viii.’62 [1962]/ L. Pena [leg.], 780 m ”/ “ Paratype ” [green label] ( CNC)  .

Type locality. Peru, Madre de Dios [but it may be the department of Cusco; see remarks], Avispa  .

Distribution. Bolivia (department of Cochabamba) and Peru (departments of Cusco and Madre de Dios).

Etymology. The name is a tribute to the dipterist Eugène Séguy, for his contributions to the taxonomy of Neotropical Ormiini  . The name is a noun in the genitive case.

Diagnosis. Ormiophasia seguyi  sp. nov. can be distinguished from other species of Ormiophasia  by head with yellow pruinosity ( Figs 6BView FIGURE 6, 8AView FIGURE 8); clypeus of same color as frontoclypeal membrane; thorax and abdomen brownishyellow ( Figs 10BView FIGURE 10, 12BView FIGURE 12, 14AView FIGURE 14); wing with strong infuscation around veins R 1 and R 2+3 and weak infuscation around veins M 1 and dm-cu ( Fig. 32GView FIGURE 32); and apex of male cerci about 2/5 length of cerci ( Fig. 40CView FIGURE 40), subrectangular in posterior view and about 1/2 width of cerci, abruptly constricted. Ormiophasia seguyi  sp. nov. is very similar to O. townsendi  sp. nov., from which it is distinguishable only in the male sex. Males of O. seguyi  sp. nov. have ocellar triangle visible in profile ( Fig. 32AView FIGURE 32) and ocelli twice the size of the dorsal ommatidia ( Fig. 6BView FIGURE 6), whereas males of O. townsendi  sp. nov. have a very constricted ocellar triangle, not visible in profile ( Fig. 37BView FIGURE 37), and ocelli smaller than the dorsal ommatidia ( Fig. 6HView FIGURE 6). Additionally, O. seguyi  sp. nov. also has male surstylus and cerci stouter ( Fig. 40CView FIGURE 40) than O. townsendi  sp. nov. ( Fig. 42CView FIGURE 42).

Description. Male. Body length 6.95–7.30 mm (mean = 7.13 mm); wing length 7.83–8.03 mm (7.93 mm) (n = 2).

Coloration. Head yellow-pruinose ( Fig. 6BView FIGURE 6). Frontal vitta brown. Ocellar triangle dark brown. Fronto-orbital plate and lunule brownish-yellow. Antenna yellowish-orange. Parafacial, gena, facial ridge and face brownish-yellow. Mouthparts brownish-yellow. Occiput brown in upper area, becoming brownish-yellow in lower area. Thorax silver-pruinose ( Figs 10BView FIGURE 10, 12BView FIGURE 12). Scutum brown; presutural scutum with three silver-pruinose stripes merged posteriorly after suture. Postpronotal lobe and lateral surface of thorax brownish-yellow. Scutellum and subscutellum 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. 32GView FIGURE 32). Tegula, basicosta, veins, halter and calypteres brownish-yellow. Legs brownish-yellow. Abdomen entirely brownish-yellow with silver pruinosity.

Head ( Figs 6BView FIGURE 6, 32A, CView FIGURE 32). Elliptic in frontal view; ratio of head height/head width 0.80. Ocelli subequal to dorsal ommatidia. Postocellar setae 2. Frontal vitta entirely obliterated. Frontal setae 7–8, convergent, posterior ones shorter and weaker. Arista weakly plumose. First flagellomere 2.5 times longer than pedicel. Face 1.4 times wider than facial ridge. Facial ridge 2.4 times wider than parafacial.

Thorax. Basisternum 0.52 times as high as wide ( Fig. 32EView FIGURE 32); median upper margin rounded and long, subrectangular. Prosternal tympanal membrane 0.66 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 6–8. Wing. Subequal to body length, three times longer than wide. Basicosta subequal in width to tegula. Base of vein R 4+5 with 2 dorsal and 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 12–15 posteroventral setae from base to apex. Fore tibia with row of 3–4 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 2–3 posterodorsal median setae and 1 preapical seta.

Terminalia ( Fig. 40CView FIGURE 40). Sternite 5 subtrapezoidal; 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 slightly curved; posterior area articulated to surstylus with open, rounded arch. Surstylus stout, thicker than apex of cerci in lateral view; posterior outer surface entirely covered with strong setae; posterior inner surface with few strong setae medially. Cerci: basal margin with distinct median projection; apex about 2/5 length of cerci, subrectangular in posterior view, narrow and tapered in lateral view; apex about 1/2 width of cerci in posterior view, abruptly constricted; apex with anterior surface U-shaped. Postgonite slightly curved, apex rounded in lateral view.

Female. Differs from male as follows. Body length 7.05–7.84 mm (mean = 7.43 mm); wing length 7.89–8.83 mm (mean = 8.32 mm) (n = 4). Head ( Figs 8AView FIGURE 8, 32B, DView FIGURE 32). Frontal vitta subequal in width to fronto-orbital plate. Frontal setae 6–8, from lunule to posterior orbital proclinate seta; second or third anteriormost frontal seta stronger and subequal to subvibrissal setae. First flagellomere 2.5 times as long as pedicel. Facial ridge 1.9 times wider than parafacial. Thorax. Basisternum 0.52 times as high as wide ( Fig. 32FView FIGURE 32); median upper margin rounded and long, subtriangular. Prosternal tympanal membrane elliptic, 0.80 times as high as wide. Wing 2.8 times longer than wide.

Remarks. The females were associated with the males both by being from the same locality and through body color and infuscation of wing. The type locality is not clear due to the register of the municipality Avispa (as “Avispas” on the label) in the department of Madre de Dios, Peru. However, nowadays, this city is inside the limits of the department of Cusco. The proposition of this new species is justified especially by the shape of the male terminalia, the body color and the infuscation of the wing. The same pattern of wing infuscation can also be seen in O. morardi  , O. buoculus  sp. nov. and O. townsendi  sp. nov. ( Figs 28GView FIGURE 28, 37G, 37HView FIGURE 37, respectively). However, O. seguyi  sp. nov. more closely resembles O. townsendi  sp. nov., especially because of the general brownish-yellow body color. Differently from O. morardi  and O. buoculus  sp. nov., whose distributions almost overlap, O. seguyi  sp. nov. ( Bolivia and Peru) and O. townsendi  sp. nov. ( Brazil) have allopatric distributions. Ormiophasia seguyi  is the first documented occurence of Ormiophasia  in the Andean region.


Canadian National Collection of Insects, Arachnids, and Nematodes