Fannia anguliseta, Gomes & Pedraza-Lara, 2023

Gomes, Lucas R. P. & Pedraza-Lara, Carlos, 2023, Fannia pretiosa-group (Diptera: Fanniidae) from Mexico: six new species from the Mexico Transition Zone and an identification key, Zootaxa 5264 (2), pp. 185-204 : 190-193

Fannia anguliseta sp. nov.

( Figs 1D, 1E, 3C, 4C, 5C, 6C, 8, 16)

Diagnosis. Fore tarsomere 1–4 white-yellowish, tarsomere 5 brown ( Fig. 8D). Mid basitarsus enlarged ventrally ( Fig. 8F). Hind coxa bare ( Fig. 1D). Hind femur slightly curved with pre-apical swelling on v surface, with a tuft of long pv setae (twice longer than width of femur) on the swelling, becoming shorter towards the base, and connected to a row of pv setae which reaches the femur base. Wing brownish ( Fig. 8B). Syntergosternite with 5 long lateral setae (the two most dorsal are curved and twice longer than sternite 5) ( Fig. 1E).

Description. Male. Body length: 6.2 mm. Wing length: 6.0 mm.

Head. Eye short and sparsely setulose. Ocellar triangle dark brown; ocellar setae proclinate and developed (as long as frontal setae). Frontal vitta velvety brownish to black with silver pruinosity, at the narrowest point twice wider than width of anterior ocellus ( Fig. 8A). Frontal setae 18. Fronto-orbital plate dark brown to black with silver pruinosity. Parafacial bare, brownish with silver pruinosity. Frontogenal suture and gena silver pruinose. Gena brownish to black ( Fig. 8A). Pedicel with dorsal seta developed, about one third of the length of arista. Postpedicel black, silver pilose.

Thorax. Scutum without vittae, with inconspicuous silver pruinose on postpronotal and notopleural regions ( Fig. 8B).Acrostichal setulae triserial presuturally and triserial to quadriserial postsuturally. Dorsocentrals 2+3, long, posterior-most postsutural pair slightly longer than the others. Prealar 2, anterior one slightly longer. Katepisternum with about 10 long and thick setae ventrally ( Fig. 8C).

Wing. Brownish ( Figs 8B, 8C). Calypters basally white and apically light brown. Haltere brown with stem light brown to yellow.

Legs. Light brown. Pulvilli light brown. Tarsi brown, except for fore tarsomeres 1–4, white-yellowish ( Fig. 8D). Fore tarsomeres 1 and 2 slightly enlarged laterally. Fore tarsomeres 5 with 3 long d setulae. Mid femur with 1 row of ad to d setae, with 1 row of decreasing av from base to apex; 1 row of long p and pv setae (thicker on the apical third) ( Fig. 8E). Mid tibia with 1 submedian ad, 1 median pd, 1 strong and long preapical d, 1 apical seta on a, ad, p, pv, and v (v longer, similar to d preapical seta) ( Fig. 8E). Mid basitarsus enlarged ventrally ( Fig. 8F). Hind coxa bare on posterior margin ( Fig. 1D). Hind femur slightly curved with pre-apical swelling on v surface, with a tuft of long setae on the pv surface which continuous in a row decreasing in length basally, 3 long preapical ad setae, 1 row of av setae (absent on the pre-apical swelling), 1 long preapical av setae, 1 short preapical ad and pd ( Fig. 8F). Hind tibia with 2 median av; 1 submedian ad; 1 apical av ( Fig. 8F).

Abdomen. Metallic light brown with silver pruinosity, elongate, with developed setae, tergite 5 with long marginal setae (slightly longer than others). Syntergosternite with 5 lateral setae, the two most dorsal are curved and twice longer than sternite 5 ( Fig. 8C). Sternite 5 rectangular, twice wider than its length, posterior margin profoundly indented ( Fig. 3C).

Terminalia. Surstyli fused with epandrium. Surstyli curved apically ( Fig. 4C, 5C). Bacilliform process long and simple, as long as half of the surstyli ( Fig. 4C). Hypandrial arms directed outwards ( Fig. 6C).

Female. Unknown.

Etymology. The specific name is derived from the Latin words anguli- (“apex”) and seta (“bristle”), it refers to the long setae in the apex of the abdomen (syntergosternite).

Type-material. Holotype. Male. Mexico. Hidalgo. Parque Ecológico El Chico, Mineral El Chico, 20°10′58′′N, 98°43′04′′W, 9.vi-16.vii.2019, Trampa aérea 5, Nuple, E. ( CNIN) . Paratypes. Same as holotype, 2 males ( CNIN; CARF, CPL2943 ) ; same as holotype, except: trampa aérea 3, 16.vii.2019, 1 male ( CNIN) . Tlaxcala. Nanacamilpa, Piedra Cantada, 19°27′23′′N, 98°36′01′′W, Trampa aérea 2, 13.vii.2019, Nuple, E., 1 male ( CARF, CPL2925 ) .

Distribution. Mexico (Hidalgo, Tlaxcala).

Remarks. F. anguliseta is similar to F. abdominiseta but can be easily distinguished from it by the brownish wing.