Fannia bigoti Stein, 1907

Dominguez, Martha Cecilia, 2007, A taxonomic revision of the Southern South American species of the genus FANNIA Robineau-Desvoidy (Diptera: Fanniidae), Papéis Avulsos de Zoologia (São Paulo) 47 (24), pp. 289-347 : 301-302

Fannia bigoti Stein, 1907 Figs. 4 A-D

Fannia bigoti Stein, 1907b:287 ; 1919:131; Malloch, 1934:204; Séguy, 1937:165; Ortiz, 1946:156; Pont, 1972:3; Carvalho et al., 1993:8; Pont &

Other material examined: Chile Magallanes, 1 o, 1 n, Ojo Bueno , 15-XII-1974 / 20-I-1975, col. G. Cerda ( MNCN). Arauco, 1 o , Isla Mocha , 15/ 19-III-1971 ( CEUC) .

Description

Male (female unknown): body length 6-7 mm

Head: Frontal vitta dark brown pruinose, at narrowest point 2.5x width of anterior ocellus. Fronto-orbital plate grey, heavily pruinose, at uppermost fr 0.75x width of anterior ocellus. Seventeen long fr 1.5x length of flagellum. Eye slightly setulose, antero-internal facets larger than remaining; pocl of irregular length, slightly shorter than outer vertical setae, becoming shorter further from the vertex. Face and parafacial silvery grey; parafacial at base of flagellum 0.75x width of same and bare. Facial carina and gena dark grey. Scape and pedicel black, flagellum grey, 2.3x as long as broad. Arista dark brown at base, black at apex, short pubescent. Palpus black, straight to slightly clavate, the apex 1.5 to 2x width of base. Lower oral margin weakly concave and groove less.

Thorax: Scutum and scutellum black to dark blue shining, apex of scutllum slightly brown; 3+4 acr; 1 strong acrs; 2+3 dc; pprn covered with setulae; 1 pral near spal, shorter than surrounding setulae but stouter, and a second very reduced pral near the transverse suture; prealar region covered with setulae; 2 prepm surrounded by numerous hair-like setulae.

Legs: Dark brown to black. F1 normal (length/ width = 6.1); 1 row of pd as long as femoral width; with 5 to 6 rows of thin p, longer than femoral width; 1 row of thin and spaced pv at base, stouter at apex. T 1 with 1 subapical pd; 1 apical v; 1 apical pv; 1 submedian and 1 apical ad. Fore tarsomere 1 expanded and white at tip, fore tarsomeres 2-5 expanded, flattened and partially white. F2 with 1 row of ad; 1 row of very short a; 1 row of stout and straight av at base, shorter and curled apically; 1 row of thin pv in basal fourth, and a preapical tuft of short and stout pv: 1 row of p stouter and ventrally directed towards apex. T 2 strongly curved, with a very conspicuous subbasal protuberance; pubescence on ventral surface longer than 0.5x tibial width; 3 apical, 1 submedial and 2 medial a; 1 subapical ad; 1 apical av; 1 apical and two submedian pd; 1 very long apical pv; 1 very long apical p. Mid tarsomere 1 with a basal ventral crest, followed by a short strong seta. C3 bare at apex of posterior surface. F3 normal to thin (length/width = 7.2); with a strong preapical protuberance on ventral surface; with 1 row of ad, dorsally directed towards apex; 1 row of very short, and 3 stouter medial av, longer than femoral width; 1 row of hair-like and a preapical tuft of long pv, 1.5x width of femur, coinciding with the ventral protuberance. T 3 with 1 submedial and 1 subapical d; 1 stronger submedial, 1 apical and 1 row of 5 weaker medial ad; 2 medial and 1 apical av; ventral and posteroventral surfaces with a strong ctenidium at apex.

Wing: Faintly smoky. Uppermost calypter rounded and lower oval, white with dark brown outer margins. Knob of halter black, dark brown at base.

Abdomen: Elongated, tergites of equal width throughout. Black to steely blue, slightly lighter coloured at middle and posterior margin of tergites 2, 3 and 4.

Postabdomen: Posterior margin of sternite 5 profoundly indented and covered with setae ( Fig. 4A ). Hypandrial arms thin, postgonite inconspicuous; aedeagus membranous ( Fig. 4B ). Posterior margin of epandrium broadened, bell shaped; cercal plate fused, tapering at apex; bacilliform process cork-screw shaped; surstyli simple, long and central to the epandrium, and clavate ( Fig. 4 C-D).

Distribution: ANDEAN: Chile.

Figures

FIGURE 4: Fannia bigoti Stein. A. Male fore tarsi, dorsal. B. Male sternite 5, ventral C. Male hypandrium, ventral. D. Male terminalia external structures, ventral.