Ormiophasia seguyi Gudin & Nihei 2019, sp. nov.
Creators: name: Gudin, Filipe M.
name: Nihei, Silvio S.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Ormiophasia
Ormiophasia seguyi

description: Ormiophasia seguyi sp. nov.
(Figures 6B, 8A, 10B, 12B, 14A, 32, 40C)
Type material. HOLOTYPE ♂ (Figs 6B, 10B, 12B, 32A, C, G): “ 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). Peru: 1 ♂ [dissected, photographed] (Fig. 32E); 3 ♀♀ [one dissected, one photographed] (Figs 8A, 14A, 32B, D, F): “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 6B, 8A); clypeus of same color as frontoclypeal membrane; thorax and abdomen brownishyellow (Figs 10B, 12B, 14A); wing with strong infuscation around veins R 1 and R 2+3 and weak infuscation around veins M 1 and dm-cu (Fig. 32G); and apex of male cerci about 2/5 length of cerci (Fig. 40C), 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. 32A) and ocelli twice the size of the dorsal ommatidia (Fig. 6B), whereas 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. 6H). Additionally, O. seguyi sp. nov. also has male surstylus and cerci stouter (Fig. 40C) than O. townsendi sp. nov. (Fig. 42C).
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. 6B). 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 10B, 12B). 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. 32G). Tegula, basicosta, veins, halter and calypteres brownish-yellow. Legs brownish-yellow. Abdomen entirely brownish-yellow with silver pruinosity.
Head (Figs 6B, 32A, C). 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. 32E); 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. 40C). 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 8A, 32B, D). 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. 32F); 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 28G, 37G, 37H, 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.
description: Published as part of 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, pp. 1-74 in Zootaxa 4643 (1) on pages 51-53, DOI: 10.11646/zootaxa.4643.1.1, http://zenodo.org/record/4000443