Fannia confusa Pont & Carvalho 1994

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 : 304-307

Fannia confusa Pont & Carvalho 1994

Figs. 6 A-G

Fannia confusa Pont & Carvalho, 1994:234 ; Carvalho et al., 2003:10.

Diagnosis: Medium size dark black-bluish species. Frontal vitta at narrowest point 0.33x width of anterior ocellus. Eye slightly setulose. Parafacial bare. Antenna brown. Palpus dark brown. Thorax black, slightly bluish. One pra near spal, 0.33x length of same and a second pra near the transverse suture, slightly longer than first. Fore tarsomere 1 flattened and expanded, partially yellowish-white; tarsomere 2 completely yellowish white; tarsomeres 3 and 4 as long as wide and partially yellowish-white. F2 constricted at apex. T 2 very curved, constricted at base and with a very conspicuous subbasal protuberance. Mid tarsomere 1 with a basal ventral crest followed by short seta. C3 bare at apex of posterior surface. F3 normal with a very conspicuous preapical protuberance on ventral and posteroventral surfaces; with a subapical tuft of curled hair-like pv, 1.5x width of hind femur. T 3, lacking medial row of ad. Wing clear. Halter dark brown. Abdomen heart-shaped, entirely black blue.

Type material examined: Holotype o, Rio Negro, Lake Gutierrez , 3/ 14-XI-1926, cols F. W. Y M. Edwards . Paratypes 4 n (same data as holotype) ( BMNH) .

Description

Male: body length 6.3 mm

Head: Frontal vitta brown, at narrowest point 0.33x width of anterior ocellus. Fronto-orbital plate silvery pruinose, at uppermost fr 0.5x width of anterior ocellus. Seventeen long fr, 1.6x length of flagellum. Eye slightly setulose, antero-internal facets larger than remaining; pocl irregular in length. Face and parafacial silvery grey; parafacial at base of flagellum 0.5x width of same and bare. Facial carina brown; gena grey. Scape and pedicel brown; flagellum 1.75x as long as broad, heavily silvery grey pruinose. Arista dark brown and short pubescent. Palpus dark brown, straight, the apex approximately as wide as the base. Lower oral margin straight, slightly grooved.

Thorax: Thorax black, slightly bluish; 4+4 acr and 1 strong presucutellar acrs; 2+3 dc; pprn covered by numerous hair-like setae; 1 pra near the spal, 0.33x length of same and a second pra near the transverse suture, slightly longer than first; prealar area bare; 2 prepm surrounded by numerous setulae.

Legs: Completely dark brown, but fore tarsi yellow at apex. F1 normal (length/width = 5.3); with 1 row of pd as long as femoral width; 3 to 4 rows of hair-like p; 1 row of basally very short pv and 5 to 6 longer than femoral width pv at apex. T 1 with 1 long subapical pd; 1 apical v; 1 apical pv; with a submedial and an apical ad, lacking medial row. Fore tarsomere 1 flattened and expanded, partially yellowish-white; tarsomere 2 completely yellowish white; tarsomeres 3 and 4 as long as wide and partially yellowish-white. F2 constricted at apex, with 1 row of ad; 1 row of hair-like av at base, shorter and stouter at apex; 1 row of curled pv, and a second shorter and stouter row in apical third; 1 row of thin p at base, stouter and ventrally directed towards apex. T 2 very curved, constricted at base and with a very conspicuous subbasal protuberance; ventral surface with long pubescence 0.96x width of mid tibia; 1 submedian and 3 apical a; two subapical ad; 1 very strong and curved apical av-v; 2 submedian and 1 apical pd; 1 apical pv. Mid tarsomere 1 with a basal ventral crest followed by short seta. C3 bare at apex of posterior surface. F3 normal (length/width = 6.6); with a very conspicuous preapical protuberance on ventral and posteroventral surfaces; 1 row of ad, longer and dorsally directed towards apex; 1 row of short av and two long av at the same level as the preapical ventral protuberance; 1 subapical tuft of curled hair-like pv, 1.5x width of F3. T 3 with 1 submedial and 1 subapical d, about the same length; 1 submedial and 1 apical ad, lacking medial row; 2 medial 1 apical av; ventral and posteroventral surface with a weak ctenidium at apex.

Wing: Clear, slightly brownish at base; lower calypter slightly oval, upper calypter rounded, both creamy white with brown outer margin. Halter entirely dark brown.

Abdomen: Heart-shaped, tergite 2 more than 2x width of tergite 4; entirely black blue. Hypopygium not protruding.

Postabdomen: The dissection of the holotype was not possible.

Female: body length 4.5-5.5 mm. Differs from male as follows:

Head: Ocellar triangle long, extending up to lower orb. Frons and vitta broad, the distance between eye margins wider than 0.33 of head width. Four to 5 strong fr, slightly longer than flagellum, with 6 to 7 long setulae in between, 0.5x length of setae. Upper and lower orb present, with 2 to 3 irregular rows of fronto-orbital setulae.

Legs: F1 with 1 row as long as femoral width and 1 or 2 shorter rows of p. T 1 with a conspicuous ctenidium at apex. Fore tarsi normal in shape, dark brown to black. F2 with a row of very short setulose av; lacking row of pv. T 2 cone-shaped, base narrower than apex; lacking ventral pubescence; 1 apical pv; 1 long apical p. F3 lacking preapical protuberance on ventral-posteroventral surfaces; lacking subapical tuft of hair-like pv.

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

Postabdomen: The dissection of the holotype was not done, because it is the only male specimen of the species.

Distribution: ANDEAN: Argentina.

Figures

FIGURE. 6: Fannia coxata Shannon & Del Ponte. A. Male hind leg, anterior. B. Male sternite 5, ventral. C. Male hypandrium, ventral. D. Male hypandrium, lateral. E. Male terminalia external structures, ventral. F. Female terminalia external structures, ventral. G. Spermatheca.