Fannia albitarsis Stein

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 : 295-298

Fannia albitarsis Stein

Figs. 2 A-H

Fannia albitarsis Stein, 1911:105 ; 1919:131; Malloch, 1934:205; Séguy, 1937:164; Ortiz, 1946:156; Pont, 1972:3; Albuquerque et al., 1981:10; Holloway, 1985:253; Carvalho et al., 1993:6; Pont & Carvalho, 1994:231-232; Perotti & Brasesco, 1996:3-8; Perotti, 1998:145-154; Pont, 2001:459-460; Carvalho et al., 2003:7.

Diagnosis: Medium size species, dark grey to black with light blue pruinescence. Frontal vitta at narrowest point 2,7x width of anterior ocellus. Eye slightly setulose. Parafacial bare. Antenna dark grey. Palpus dark brown. Scutum dark grey to black, slightly light bluish, grey light bluish vittae visible in full length of acr and dc line. One pral near the supraalar seta, 0.33x length of spal and a second pral near the transverse suture slightly shorter than the first. Fore tarsomere 1 flattened and expanded, partially yellow whitish and with a broad leaf-like spine at the tip of posterior surface; tarsomere 2 completely white yellow; tarsomere 3and 4 as wide as long, partially yellow-white. T 2 constricted at base, with a subbasal protuberance. C3 bare at apex of posterior surface. F3 thin; with a very prominent preapical protuberance on ventral and posteroventral surfaces and with a preapical tuft of hair-like pv, 1.5x femoral width. T 3 lacking median row of ad. Wing clear. Halter yellow brown. Abdomen heart shaped and with darker triangular markings on tergites 2-4.

Material examined: Argentina. Tucumán 1 o, Quebrada La Loma , 21-X-1949, col. R. Golbach ( FIML) . Mendoza 42 o, 8 n, Maipú, Barrio COVE, XI-2000, col. Domínguez ( IADIZA) . 16 o, 71 n, Valles fértiles, XI-2001, col. ISCAMEN ( IADIZA) ; 2 o, 1 n, CRICYT, Ciudad , X-2001, cols. Debandi, Domínguez & Scheibler ( IADIZA) . Chile. Tarapacá 1 o, Iquique, col. Herrera ( CEUM) . 1 o, Mamiña, col. Herrera ( CEUM) . Valparaíso. 3 o, Archipiélago Juan Fernández , Isla Robinsón Crusoe, Camino al Palillo , 2-I-1993 cols. Marshall & Gonzalez ( CEUM) . Santiago 1 o, Talagante, col. Zapata ( CEUM) . Antofagasta 2 o, Calama , 7-XII-1959 ( CEUM) . Malleco 2 o, Angol , 23-XI-1970 ( CEUC) . 5 o, San Vicente, 15-VIII-1995, col. J. N. Artigas ( CEUC) .

Description

Male: body length 5.0-6.0 mm.

Head: Frontal vitta dark brown to black, at narrowest point 2,7x width of anterior ocellus. Fronto-orbital plate grey, heavily pruinose, at uppermost fr slightly narrower than anterior ocellus. Sixteen long fr, 1.3x length of flagellum. Eye slightly setulose, antero-internal facets larger than remaining; pocl of irregular length in first quarter. Face and parafacial silvery grey; parafacial at base of flagellum 0.9x width of same and bare. Facial carina dark grey to brownish red in some specimens. Scape and pedicel dark grey, flagellum 2.2x as long as broad and covered with silver grey pruinosity. Arista black and aristal pubescence shorter than aristal width at base. Palpus dark brown, slightly clavate, the apex 1.5x the width of the base. Lower oral margin convex and grooveless.

Thorax: Scutum dark grey to black, slightly light bluish, grey light bluish vittae visible in full length of acr and dc lines; pleura grey; apex of scutellum light blue greyish; 3+4 acr, with two additional prescutellar acr; 1 strong prescutellar acrs; 2+3 dc; pprn with few setulae; one pral near spal, 0.33x length of same and a second pral near the transverse suture slightly shorter than the first; prealar area bare; two prepm surrounded by numerous hair like setulae.

Legs: Dark grey to black, yellow brown at articulations. F1: normal to thin (length/width = 7.1), with 1 row of pd as long as femoral width, with five to six rows of short hair-like p; 1 row of pv slightly longer than femoral width. T 1 with 1 subapical pd; 1 apical v and 1 apical pv; 1 apical and 1 submedial ad, lacking medial row of ad. Fore tarsomere 1 flattened and expanded, partially yellowish white and with a broad leaf-like spine at the tip of posterior surface; tarsomere 2 completely yellowish white; tarsomere 3 and 4 as wide as long, partially yellowish white ( Fig. 2A ). F2 with 1 complete row of ad and 1 row of a; 1 row of hair-like av at base, stout and shorter towards apex; 1 complete row of hair-like pv at base, and two rows of shorter and stouter setae in apical third; 1 row of hair-like p at base, stouter and ventrally directed at apex. T 2 constricted at base, with a subbasal protuberance; ventral pubescence short, 0.3x tibial width; with 1 submedian and 3 apical a; 1 subapical ad; 1 strong, slightly curved apical av; 1 submedian and 1 weaker apical pd; 1 short and stout apical p. Mid tarsomere 1 with a basal ventral crest, followed by short strong seta. C3 bare at apex of posterior surface. F3 thin (length/width = 10); ventral and posteroventral surfaces with a very prominent preapical tubercle ( Fig. 2B ); 1 row of ad, longer and dorsally directed towards apex; 1 row of av as long as femoral width, interrupted preapically and with 2 or 3 long apical av; preapical tuft of hair-like pv, 1.5x femoral width. T 3 with 1 long submedian and 1 shorter (0.5x length of submedian) subapical d, 1 submedian and 1 apical ad, lacking median row; 2 medial and 1 apical av; ventral and posteroventral surfaces with a weak apical ctenidium at apex.

Wing: Clear. Lower calypter slightly oval, the uppermost is rounded, both white; knob of halter yellow brown, dark brown at base.

Abdomen: Heart-shaped, tergite 2 2x width of tergite 4. Dark grey to black covered with light blue to greyish pruinescence, with darker triangular markings on tergites 2, 3 and 4. Hypopygium not protruding.

Postabdomen: Posterior margin of sternite 5 profoundly indented and covered with setae ( Fig. 2C ). Hypandrium thin, postgonite inconspicuous ( Fig. 2D ). Posterior margin of epandrium broadened, bell-shaped; cercal plate fused and tapering at apex; bacilliform process corkscrew-shaped; surstyli simple, long and central respect to the epandrium, slightly clavate ( Figs. 2 E-F).

Female: body length 5.0- 5.7 mm. Differs from male as follows:

Head: Ocellar triangle short, extending up to the fourth fr. Fron and frontal vitta broad, the distance between eye margins is wider than 0.33x of head width. Four to five strong fr, slightly longer than flagellum and bearing six to seven long setulae between fr, half as long as the setae. With upper and lower orb, and two to three rows of fronto-orbital setulae.

Leg: F1 with 1 row of p as long as femoral width; 1 or 2 short rows of pv. T 1 with a conspicuous subapical ctenidium. Fore tarsi dark brown to black, lacking leaf-like spine at apex of posterior surface of basal tarsomere. F2 with 1 row of short av, lacking row of pv. T 2 tapering towards the base, ventral pubescence absent; 1 apical pv; 1 apical p, longer than pv. F3 lacking preapical tubercle and hair-like pv.

Abdomen: Heart-shaped, this shape much more pronounced than in the male, tergite 2 2x width of tergite 4; uniformly dark grey.

Postabdomen: Cerci normal, short; anal plate longer than broad and uniformly covered with setulae; sternite 8 reduced to a anterior pair of circular plates bearing two setae and four to five setulae; postabdominal spiracles 7 and 8 on tergite 6 ( Fig. 2G ). Two pear-shaped spermathecae, slightly grooved, with partially sclerotized ducts ( Fig. 2H ).

Distribution: NEOTROPICAL: Peru, Bolivia, South of Brazil; ANDEAN: Chile, Argentina, Falkland Islands. Introduced probably through commerce, into South Africa, Australia and New Zealand ( Pont & Carvalho 1994).

Figures

FIGURE 2: Fannia albitarsis Stein. A. Male fore tibia and tarsi, dorsal. B. Male hind leg, anterior. C. Male sternite 5, ventral. D. Male hypandrium, ventral. E. Male terminalia external structures, ventral. F. Male terminalia external structures, lateral. G. Female terminalia, ventral. H. Spermatheca.