Helina ouina, Patitucci, Luciano Damián, Mulieri, Pablo Ricardo & Mariluis, Juan Carlos, 2016

Patitucci, Luciano Damián, Mulieri, Pablo Ricardo & Mariluis, Juan Carlos, 2016, Taxonomic review of the species of Helina R. - D. (Diptera: Muscidae) from Andean-Patagonian forests, Zootaxa 4150 (3), pp. 281-313 : 304-306

Helina ouina sp. nov.

( Figs. 12 , 15 C)

Description. Male ( Fig. 12 A). Length. Body: 7.14–8.05 mm, wing: 5.95–7.61 mm.

Head ( Fig. 12 B). Black with silver pollinosity. Holoptic, the shortest distance between eyes is 0.17–0.28 mm. 6–8 pairs of frontal setae, the upper shorter. Eye hairs long and sparse. Lunule pale brown; fronto-orbital plate, parafacial, gena, postgena, and occiput black with silver pollinosity. Postocular setae proclinate. Antenna black; arista bare. Palpus black.

Thorax ( Fig. 12 C). Scutum black with three grey pollinose vittae fused behind the suture; scutellum black with grey pollinosity and lateral margin with yellow pollinosity; anepisternum, anepimeron, katepimeron, katepisternum, proepisternum, proepimeron and meron black with grey pollinosity; anterior and posterior spiracles black. Chaetotaxy: acrostichal setae 1-2+1; dorsocentral setae 2+4; humeral setae 2–3; notopleural setae 2, with similar side. Prealar seta strong, half as long as its anterior supra-alar postsutural seta. Scutellum with strong and short basal and subapical setae. Anepisternum with a series of 8–10 strong setae.

Wing. Hyaline, infuscate; costal spine little longer than the costal bristles; transverse cross-vein r-m infuscated, an extra little vein close to cross-vein r-m; the transverse cross-vein dm-cu curved and infuscated; vein R 4+5 and vein M straight; cross vein dm-cu in basal half of cell r4+5. Both calypters yellow with yellow margins.

Legs. Coxa, trochanter, fore femur black, mid and hind femora black with apice yellow, mid and hind tibiae, and tarsi black, hind tibia yellow, brown at base. Fore femur, with long and fine setae on dorsal, posterodorsal, and posteroventral surface; fore tibia black with 1–2 posterior setae. Mid femur with a posteroventral row of setae, and 3 preapical setae on posterodorsal to posterior surface; mid tibia with 3–4 posterior setae, and 4 apical setae (anterodorsal, posteroventral, ventral, and anteroventral). Hind femur with an anterodorsal row and 5–6 anteroventral setae at the apical middle, hind tibia yellow with 6–8 anteroventral setae, 3–4 anterodorsal setae and 6–7 posterior setae, calcar absent. Claws and pulvilli with similar size in all three legs.

Abdomen ( Fig. 12 D). Black with silver pollinosity. Sternite 5 with similar length and width, setulose; posterior margin with two processes ( Fig. 12 E).

Terminalia . Cercal plate with a similar length and width, with two incision (distal incision longer than proximal incision); with four protuberances at the apex: inner protuberance long and straight, outer protuberance protuberance short, wide, and rounded ( Fig. 12 F). Surstylus broad distally, distal part curved forwards, on inner surface with setae in a button-shaped structure ( Fig. 12 G). Aedeagus with aedeagal apodeme straight and strongly sclerotized, epiphalus slightly sclerotized, paramere slightly bent downward with setula; gonopod narrow at middle and with short setulae; and distiphallus campanulate, slightly sclerotized ( Fig. 12 H).

Female. Length. Body: 5.77–7.8 mm, wing: 5.69–6.63 mm.

Differs from male as follows: Head: dichoptic, the shortest distance between eyes is 0.82–0.95 mm; frontoorbital plate setulose with 2 reclinate orbital setae. Parafrontal plate setulose. Postocular setae divergent. Legs. Fore femora black with apice yellow, mid and hind femora, and tibiae yellow. Hind femur with 2–3 setae in the apical third of anteroventral surface, hind tibia with 3–4 anteroventral setae, 4–5 posterodorsal setae.

Terminalia . Tergite 8 with 2 parallel sclerotized plates, fused and with setulae on distal margin; epiproct with proximal margin straight, and a row of setula on distal margin; cercus digitiform and setulose ( Fig. 12 I). Hypoproct rounded, sclerotized with setulose ( Fig. 12 J).

Type material. Holotype male, pinned: “Arg. T. del Fuego / P.N. Ushuaia, I-96 / Mariluis col.” (MACN). Paratypes: eight males, same label data as holotype (MACN).

Other material examined. ARGENTINA: Tierra del fuego: 1 female, Lago Fagnano , -54.537434, - 67.223272, I-1982, Gondell leg. ( MACN) , 1 female, PN Tierra del Fuego, -54.834897, -68.446657, I-1999, Mariluis leg. ( MACN) .

Distribution ( Fig. 15 C). ARGENTINA: Tierra del Fuego.

Remarks. Helina ouina sp. nov. is distinguished from the species of the genus by arista bare, the presence of spots on the wing, and a extra vein close to cross-vein r-m.

Biology. The specimens captured by JCM were collected over rotten meat with a hand net.

Etymology. The term " ouina " is a noun in apposition; the word was used by the indigenous tribe Yamana of Tierra del Fuego to designate a fly.

Figures

FIGURE 12. Helina ouina sp. nov. A – H. Male: A. Lateral view (scale bar: 1 mm). B. Head, frontal view. C. Thorax, dorsal view. D. Abdomen, dorsal view (scale bars: 0.5 mm). E. Sternite 5 (scale bar: 0.2 mm). F. Cercal plate, posterior view. G. Cercal plate and surstylus, lateral view (scale bar: 0.1 mm). H. Phallic complex, lateral view (scale bar: 0.1 mm). I – J. Female, apical portion of ovipositor: I. Dorsal view. J. Ventral view (scalebar: 0.5 mm). (Abbreviations: aed apod, aedeagal apodeme; distiph, distiphallus; epiph, epiphallus; epiprct, epiproct; gon, gonopodo; hyprct, hypoproct; i protub, inner protuberance; o protub, outer protuberance; par, paramere; st 8, sternite 8; tg 8, tergite 8.)

FIGURE 15. Geographical distribution. A. Helina neosimplex Snyder. B. Helina nigrimana (Macquart). C. Helina ouina sp. nov. D. Helina rufoapicata Malloch. E. Helina viola Malloch. G. Helina xena Malloch. (Green area: Andean-Patagonian forests; orange circle: new records; blue triangle: previous distribution.)