Exsul singularis Hutton, 1901

Barbosa, Leandro Silva & Couri, Márcia Souto, 2013, New species and redescriptions of the New Zealand genus Exsul Hutton (Diptera: Muscidae: Coenosiinae), Zootaxa 3647 (2), pp. 382-389 : 383-386

Exsul singularis Hutton, 1901

( Figs. 2–6 )

Exsul singularis Hutton, 1901: 75 . Holotype male [not examined], Type-locality: New Zealand, southwest of South Island.

Diagnosis. Dorsocentrals 3+4. Wings very broad and dark brown in males, with a remarkable brown suffusion along sides of all veins in females. Pilosity denser than in the other species.

Male. Body length: 13 mm; wing: 15 mm

General coloration. Ground color dark brown with gray pollinosity; frons dark gray; fronto-orbital plate and gena gray, with silver pollinosity. Dorsum of mesonotum gray with four dark gray vittae. Calypters and halter whitish. Wing dark brown with hyaline spots. All femora gray and tibiae shining black. Abdominal tergites dorsally with faint brown spots and gray laterally.

Head. Male dichoptic. Frontal row with 10 setae each side. Fronto-orbital plate covered with cilia. Ocellar plate short. Ocellar setae long and ocellar cilia long and hooked at apex. Antenna short, not reaching the epistome; postpedicel slightly larger than pedicel. Arista with short pubescence. Palpus cylindrical. Parafacial with cilia. Cheeks upwards projected.

Thorax. Proepimeral seta developed and upward directed. Dorsocentral setae 3+4; prosternum bare; notopleurals 2; anepimeron bare; katepimeron with covering cilia; katepisternals 1+2. scutellum with covering cilia and one pair of basal, subbasal, subapical, apical and discal setae. Prealar setae absent. Wings very large; dm-cu longer than in the other species; veins R1 bare apically on dorsal surface; dorsal and ventral surfaces of the radial node bare. M and R4+5 divergent to apex. Legs with intense pilosity; all femora with anteroventral and posteroventral rows of setae; hind tibia with anterodorsal and posterodorsal rows of setae.

Abdomen. Elliptic with intense pilosity. Sternite 1 bare.

Terminalia. Hypandrium plate-like. Aedeagus apex slender; distiphallus complex with sclerotized structure and distal membrane developed; gonopod relatively short and paramere developed and subpointed ( Fig. 2 ). Sternite 5 setulose, subquadrangular ( Fig. 3 ). Cercal plate developed with posterior concavity ( Fig. 4 ).

Female. Length: 11 mm, wing: 13 mm

Similar to male, differing as follows: wings not as broad as in males and not dark brown. All veins with a remarkable brown suffusion along their length. Legs without intense pilosity; fore and hind tibia with a posterior median seta.

Ovipositor. Moderately long, with large tergites with setae on posterior margins. Sternite 6 broad and sternite 7 arrow-shape with five setae ( Fig. 5–6 ).

Note. The general appearance of this species is very peculiar, differing from all others muscids by the large and dark wings of male.

Material examined. NEW ZEALAND: McKinnon Pass, 05.i.1928 [13 (nº39.042), 1Ƥ (nº81.806) AMNZ], 28.xii.1919, Tillyard col., [13, USNM], 29.xii.1919 [1Ƥ (nº85.712 and 81.805), AMNZ]; WD Mark Ra., 1.120m, 10.i.1996, B.M.Patrick col., [13 (nº23.582), AMNZ]. MC Cass, South Island, 1930, G.A. Helson & Tawera col. [13 (nº39.046), AMNZ]. WD Mt. Moltke, Franz Josef, 20.i.1925, [no collector name], [2Ƥ (nº85.714 and 85.713), AMNZ]. NC Arthurs Pass NP, 1.375m, 17.i.1998, J.W. Early & R.F. Gilbert col. [13 (nº81.807), AMNZ].

Figures

FIGURES 2 – 6. Exsul singularis Hutton: 2 — hypandrium; 3 — sternite 5; 4 — cercal plate; 5 — ovipositor, dorsal view; 6 — ovipositor, ventral view.