Fannia punctiventris Malloch, 1934

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 : 328-330

Fannia punctiventris Malloch, 1934

Figs. 15 A-F

Fannia punctiventris Malloch, 1934:207 ; Ortiz, 1946:157; Seago, 1954:7; Hennig, 1955a:26; Pont,1972:6; Carvalho et al., 1993:13; 2003:16.

Diagnosis: Small dark brown species. Frontal vitta at narrowest point reduced to a very thin line, 0.25x width of anterior ocellus. Eye scarcely setulose. Antenna and palpus dark brown to black. Thorax dark brown. Two strong pra near spal. T 2 constricted in basal half. C3 with 2 hair-like p at apex of posterior surface. F3 with a preapical protuberance only conspicuous on posterior surface, with 1 row of very short pv, and a subapical tuft of hair-like pv as long as femoral width. T 3 lacking medial row of ad. Wing clear. Halter yellow-whitish. Abdomen heart-shaped and trimaculated.

Type material examined: Holotype o: Chile, Santiago ( BMNH).

Other material examined: 1 o Chile, Archipiélago Juan Fernández, Masatierra Yunque 12-II-51 ( CEUM). 2 n, B° Cumberld, 13-III-51 ( CEUM).

Description

Male: body length 3.9 mm.

Head: Frontal vitta black, at narrowest point reduced to a thin line, 0.25x width of anterior ocellus. Frons covered with heavy silvery pruinescence, at uppermost fr 0.3x width of anterior ocellus. Twelve long fr, 2x length of flagellum. Eye scarcely setulose, antero-internal facets more than 2x diameter of remaining; 2 rows of pocl in first quarter. Face and parafacial silvery grey; parafacials at base of flagellum 0.4x width of same and bare. Facial carina grey, gena dark grey to black. Scape and pedicel dark brown, flagellum covered with very heavy silvery-grey pruinescence. Palpus dark brown to black, slightly clavate, the apex 2x width of the base. Lower oral margin concave, grooveless.

Thorax: Dark brown; 1 prescutellar acrs; 2+3 dc; pprn covered with numerous setulae; 2 strong pra near spal; prealar area bare; 2 prepm surrounded by five setulae.

Legs: Dark brown, tibiae slightly clearer. F1 normal (length/width = 5.5), with 1 row of pd hair-like and as long as femoral width; 2 rows of hair-like p; 1 row of pv, short in basal 1/4 with 8 to 9 long pv in remaining. T 1 with 1 subapical pd; 1 apical v and pv; 1 submedial and 1 apical ad, lacking medial row of ad. Fore tarsomere 1 0.3x lenght of t1, tarsomere 4, as long as broad. F2 with 1 row of ad; 1 row of short a; 1 row of av, long and spaced at base, shorter and grouped at apex; 1 complete row of straight pv, with a second hooked row in apical 1/4; 1 row of long and hair-like p. T 2 constricted in basal half; ventral pubescence long and scarce, 0.7x width of tibia; 1 submedial and 4 apical a; 1 subapical ad; 1 strong av-v; 1 submedial and 1 apical pd; 1 apical pv and 1 p. C3 with 2 hair-like p at apex of posterior surface. F3 normal (length/width = 5.9), with a preapical protuberance in posterior surface; 1 row of ad shorter and dorsally directed towards apex; two apical av as long as femoral width; 1 row of very short pv, and a subapical tuft of hair like pv, as long as femoral width. T 3 with 1 submedial and 1 subapical d; 1 submedial and 1 apical ad, lacking medial row of ad; 2 medial av; 1 short apical av; apex of ventral and posteroventral surface with a weak ctenidium.

Wing: Clear. Lower calypter slightly oval, upper rounded, both white with dark brown margins. Knob of halter yellow-whitish, stalk and base brown.

Abdomen: Heart-shaped, tergite 2 more than 2x width of tergite 4. Dark grey, tergites 2, 3 and 4 trimaculated.

Postabdomen: Posterior margin of sternite 5 profoundly indented and bearing most setae ( Fig. 15A ). Hypandrium thin, hypandrial arms with apical triangular extensions and directed outwards; postgonite inconspicuous; aedeagus membranous ( Fig. 15B ). Epandrium slightly broadened in anterior half, bell-shaped; cercal plate fused, slightly tapering at apex; bacilliform process cork-screw shaped; surstyli medial respect to epandrium, very long, the base narrower than apex ( Fig. 15 C-D).

Female: body length 3.8 mm. Differs from male as follows:

Head: Frontal vitta dark brown. Ocellar triangle long, extending up to third fr or lower orb. Frons and vitta broad, the distance between eye margins wider than 0.33x head width. Four to five stout fr, shorter than flagellum, with interstitial setulae 5x length of setae. Upper and lower orb present, with 1 row of long fronto-orbital setulae; pocl of irregular length and short. Outer and inner verticals longer than in male.

Thorax: Ground colour grey, with brown vittae visible in full length of acr, dc and ia lines.

Legs: T 1 with 1 submedial and 1 apical ad. F2: row of av absent; 2 to 3 pv at base. T 2 straight, cone-shaped, the base narrower than apex; ventral pubescence absent; 2 apical and 1 submedial pv-v; 1 apical p; 1 apical and 1 submedial pv. C3 with 1 p at apex of posterior surface. F3 lacking preapical protuberance on posterior surface; posterior and posteroventral surfaces bare. T 3 with 1 submedial ad, the apical ad absent.

Postabdomen: Cerci normal, short; anal plate as long as broad and uniformly covered with setulae; sternite 8 reduced to a pair of anterior plates bearing 2 setae and 4 to 5 setulae; post abdominal spiracles 7 and 8 on tergite 6 ( Fig. 15E ). Two pear-shaped, grooved spermathecae, with partially sclerotized ducts ( Fig. 15E ).

Distribution: ANDEAN: Chile.

Figures

FIGURE 15: Fannia punctiventris Malloch. A. Male sternite 5, ventral. B. Male hypandrium, ventral. C. Male terminalia external structures, ventral. D. Male terminalia external structures, lateral. E. Female terminalia external structures, ventral. F. Spermathecae.