Fannia scalaris ( Fabricius, 1794 )

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 : 334-336

Fannia scalaris ( Fabricius, 1794)

Figs. 1D , 18 A-H

Musca scalaris Fabricius, 1794:332 ; Hennig, 1955b:8-10; 1955c:81.

Fannia scalaris ; Malloch, 1934:203; Séguy, 1937:174; Ortiz, 1946:157; James, 1947:127; Chillcott, 1961:61; Pont 1972:6; Albuquerque et al., 1981:10; Almeida et al., 1985:279-284; Queiroz & Carvalho, 1987:277; Carvalho et al., 1993:15; Guimarães & Papavero, 1999:266; Carvalho et al., 2002:108-112; 2003:18.

Diagnosis: Medium to large size grey-bluish species. Frontal vitta at narrowest point as wide as anterior ocellus. Eye bare. Parafacial bare. Antenna dark grey to black. Palpus dark grey to brown. Thorax covered with light bluish to grey pruinescence, with grey vittae along full length of acr, dc, and ia lines. One pra near spal, 0.2x length of same. F1 with a subapical anterior patch of very short setulae. C2 with 3 strong spines on anterior surface. T 2 thin, constricted at base, lacking subbasal protuberance, with a very conspicuous preapical protuberance. C3 with 1 setulae at apex of posterior margin. F3 lacking preapical protuberance on posteroventral surface; with 1 row of very short pv; posterior and posterodorsal surfaces covered with hair-like setulae in basal 1/4. T 3 with 4 to 5 medial av and 3 to 4 medial pv. Wing clear. Halter yellow. Abdomen elongated, greyish blue.

Material examined: Canada: Ontario 3 o, 3 n, London, 1996 ( FMNH) . USA: Colorado 1 n, ( FMNH) . Argentina: Mendoza, 5 o, 20 n, Valles fértiles, XI-2001. 1 o, Guaymallén. I-2002, Col. Domínguez ( IADIZA) . Neuquen 5 o, San Martín de los Andes , II-2001, Col. Domínguez, ( IADIZA) , Río Negro , 1 o , Isla Choel Choel , 21-I-1946, ( FIML) . Chile: 1 o, 1 n, Victoria , 25-X-1932, ( USNMNH) . 1 o, 1926 ( USNMNH).

Description

Male: body length 6.1-6.7 mm.

Head: Frontal vitta dark grey, at narrowest point as wide as anterior ocellus. Fronto-orbital plate covered with silvery grey pruinescence, at uppermost fr 0.75x width of anterior ocellus. Thirteen long fr, 1.4x length of flagellum. Eye bare, antero-internal facets larger than remaining; pocl irregular in length. Face and parafacial silvery grey, parafacial at base of flagellum 0.9x width of same and bare. Facial carina and gena dark grey. Scape and pedicel dark grey to black, flagellum short, 2.2x as long as wide, heavily covered with silvery-grey pruinescence, yellowish at apex. Arista completely dark brown, short pubescent. Palpus dark grey to brown, straight, the apex 1.5x width of base. Lower oral margin straight and groove less.

Thorax: Scutum grey covered with light bluish to grey pruinescence, grey vittae along full length of acr, dc, and ia lines; apex of scutellum and pleura grey; 3+3 acr, with a fourth row of post-sutural acrs in apical 1/3 and 1 prescutellar acrs; pprn covered with setulae; 1

pra near spal, 0.2x length of same; prealar area covered with setulae; 2 prepm surrounded by several setulae.

Legs: Brown to dark brown, tibia yellow at base. F1 normal (length/width = 6), with a subapical anterior patch of very short setulae; 1 row of pd; 2 rows of p; 1 complete row of pv, longer than femoral width. T 1 with 1 subapical pd; 1 apical v; 1 apical pv; 1 apical and 2 submedial ad, lacking medial row of ad. Fore tarsomere 1 slightly longer than 0.3x length of T 1; tarsomere 4 short, as broad as long. C2 with 3 strong spines on anterior surface ( Fig. 1D ). F2 with 1 row of ad; 2 rows of short a; 1 row of strong av; 1 long basal pv and 1 row of distally hooked pv, that form a clump in medial 1/3 of posteroventral and ventral surfaces; 1 row of p, long and hair-like at base, which are stouter and ventrally directed towards apex ( Fig. 18A ). T 2 thin, constricted at base, lacking subbasal protuberance, with a very conspicuous preapical protuberance, broadly glossy on its outer margin, ventral mat negligible, scarcely visible except preapically; ventral pubescence very short, 0.3x tibial width; 1 submedial and 3 apical a; 1 subapical ad; 1 very long and stout av-v; 1 submedial and 1 apical long pd; 1 apical pv; 1 long apical p ( Fig. 18A ). C3 with 1 setulae at apex of posterior margin. F3 normal (length/width = 5.7), lacking preapical protuberance on posteroventral surface, with 1 row of ad, longer and dorsally directed towards apex; 1 row of short av and 4 long av in apical 1/4, as long as femoral width; 1 row of very short pv; posterior and posterodorsal surfaces covered with hair-like setulae in basal 1/4 ( Fig. 18B ). T 3 with 1 submedial and 1 subapical d; 1 submedial, 1 apical, and 7 medial ad; 1 short apical and 4 to 5 medial av; 3 to 4 medial pv; ventral and posteroventral surfaces with a weak ctenidium at apex ( Fig. 18B ).

Wing: Clear. Lower calypter oval, upper rounded, both yellowish-white. Knob of halter yellow, stalk and base brownish-yellow.

Abdomen: Elongated, the width of all tergites almost equal; greyish blue, covered with dark grey pruinescence, anterior margins of tergites 2, 3 and 4 with lighter colouration. Hypopygium not protruding.

Postabdomen: Posterior margin of sternite 5 weakly indented, and bearing most setae, these also in central longitudinal line ( Fig. 18C ). Hypandrial arms directed outwards; postgonite inconspicuous; aedeagus membranous ( Fig. 18D ). Cercal plate fused, slightly bilobated in anterior region; bacilliform process cork-screw shaped; surstyli short, simple and marginal, weakly connected to epandrium ( Figs. 18 E-F).

Female: body length 5-5.7 mm. Differs from male as follows:

Head: Frontal vitta dark brown, reddish near lunula in some specimens. Ocellar triangle very short, extending up to the space between uppermost and second fr. Fronto-orbital plate and vitta broad, the distance between eye margins wider than 0.33x of head width. Antero-internal eye facets slightly broader than remaining. Seven fr, with 2 to 3 fr longer than flagellum, remaining shorter. Upper and lower orb present, with two rows of fronto-orbital setulae; pocl shorter than 0.3x length of outer and inner vertical setae, the latter longer than in male.

Legs: F1 lacking preapical patch of a; 1 row of p as long as pd and 3 shorter rows of p. C2 lacking spines on anterior surface. F2 with 5 rows of short and thin a; 1 long basal and 1 short row of pv, shorter than 0.5x width of F2, shorter at apex. T 2 cone-shaped, the base narrower than the apex. Ventral pubescence absent. T 3 with 3 short medial and 1 short apical av.

Abdomen: Slightly heart-shaped, tergite 4 less than 0.5x width of tergite 2. Uniformly dark grey.

Postabdomen: Cerci normal, short; anal plate as broad as long and covered with setulae throughout; sternite 8 reduced to a small pair of plates bearing 2 long setae in anterior region and 4 to 5 very short spinules on posterior region; postabdominal spiracles 7 and 8 on tergite 6 ( Fig. 18G ). Three pear-shaped, smooth, spermathecae; one slightly smaller than remaining, all with partially sclerotized ducts ( Fig. 18H ).

Distribution: COSMOPOLITAN.

Figures

FIGURE 1: F. coxata Shannon & Del ponte. A. Male hind coxa and abdomen, lateral. F. schnusei Stein. B. Male fore tarsi, dorsal. C. Male hind leg, anterior. F. fusconotata (Rondani). D. Male head, anterior. F. scalaris (Fabricius). E. Male mid coxa, anterior. F. roigi sp. nov. F. Male mid tibia, posterior. G. Male hind leg, anterior. F. hermani sp nov. H. Wing.

FIGURE. 18: Fannia scalaris (Fabricius). A. Male mid leg, posterior. 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 external structures, ventral. H. Spermathecae.