Fannia pusilla ( Bigot, 1885 )

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 : 330

Fannia pusilla ( Bigot, 1885)

Ophira pusilla Bigot, 1885:304 .

Homalomyia pusilla ; Stein, 1907b:285; 1919:132; Séguy, 1937:173.

Fannia pusilla ; Ortiz, 1946:157; Pont, 1972:6; Pont & Carvalho, 1994:236; Pont, 2000a:109; 2000b:23-24; Carvalho et al., 1993:14; 2003:16-17.

Diagnosis: Black bluish medium size species. Frontal vitta at narrowest point 6.7x width of anterior ocellus. Eye bare. Parafacialia bare. Antenna and palpus brown. Thorax metallic blue in ground colour, covered with black pruinescence. Two pra almost indistinguishable from ground setulae, one situated near spal and a second near tranverse suture, 3x length of first. C3 bare at apex of posterior surface. T 3 with 2 submedial av. Wing clear. Halter black.

Type material examined: Holotype n, “ Chili ”, col. J. Bigot ( UMO).

Description

Female (male unknown): body length 4.0 mm.

Head: Frontal vitta covered with light brown pruinescence, at narrowest point 6.7x width of anterior ocellus. Frons dark brown, at uppermost fr, 4x width of anterior ocellus. Seven fr 0.6x flagellum. Eye bare, antero-internal facets of same diameter as remaining; pocl of regular length. Face and parafacial covered with brown pruinescence; parafacial at base of flagellum 0.5x width of same and bare. Facial carina and gena dark brown. Scape and pedicel light brown, flagellum 1.8x as long as broad and covered with heavy dark grey to brown pruinescence. Arista brown, short pubescent. Palpus dark brown, clavate, the apex more than 2x width of base. Lower oral margin concave, and grooveless.

Thorax: Scutum and scutellum metallic blue in ground colour, covered with black pruinosity. Pleura grey, with blue metallic reflections, and covered with brown pruinescence; 2+3 dc; pprn covered with numerous long and thin setulae; 2 pra almost indistinguishable from ground setulae, one situated near spal and a second near transverse suture, 3x length of first; prealar region bare; 2 prepm surrounded by numerous long setulae.

Legs: Completely black. F1 normal (length/width: 5.8), 1 row of pd; 2 rows of p in basal 1/2; 1 complete row of pv. T 1 with 1 subapical pd, 1 apical v and pv; 1 complete row of setulose ad and 1 submedial; 1 apical ad. F2 with 1 row of weak ad. T 2 straight, cone-shaped, with 1 submedial and 3 apical a, 1 subapical ad; 1 strong straight av-v; 1 submedial and 1 apical pd; 1 apical p; 1 apical pv. C3 bare at apex of posterior surface. F3 normal (length/width = 6), with 1 row of ad, longer, stouter and dorsally directed towards apex; 1 row of very short av, and 2 av as long as femoral width in apical 1/4. T 3 with 1 submedial and 1 subapical d; 1 submedial and 1 apical ad; 2 submedial av.

Wing: Clear. Lower and upper calypteres rounded, both white. Knob of halter black, stalk and base dark brown.

Abdomen: Heart-shaped, tergite 2 more than 2x width of tergite 4. Metallic blue in ground colour, covered with dark brown to black pruinescence.

Postabdomen: The dissection of the holotype was not possible.

Distribution: ANDEAN: Chile.

Remarks: The original description of Fannia pusilla is based on a single specimen, very similar to the female of F. schnusei , from which it is separated by the smaller body size and the 2 av on T 3, instead of 4.