Fannia bisetata, 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 : 193-194

publication ID	https://doi.org/ 10.11646/zootaxa.5264.2.2
publication LSID	lsid:zoobank.org:pub:97A03469-519D-49D7-8D0E-2F6648CCB922
DOI	https://doi.org/10.5281/zenodo.7836377
persistent identifier	https://treatment.plazi.org/id/0396A100-C216-EE7A-DDF7-FB6044C814CC
treatment provided by	Plazi
scientific name	Fannia bisetata
status	sp. nov.

Treatment

Fannia bisetata View in CoL sp. nov.

( Figs 3E View FIGURE 3 , 4E View FIGURE 4 , 5E View FIGURE 5 , 6E View FIGURE 6 , 10 View FIGURE 10 , 16 View FIGURE 16 )

Diagnosis. Fore tarsi brown ( Fig. 10D View FIGURE 10 ). Hind coxa with two long setulae posteriorly. Hind femur curved with preapical swelling on v surface, with an av tuft with 3 long setae and a pv tuft with 5 long setae (three times longer than the femur width) on the swelling ( Fig. 10F View FIGURE 10 ). Wing brownish.

Description. Holotype male. Body length: 5.2 mm. Wing length: 5.2 mm.

Head. Eye densely setulose. Ocellar triangle black; ocellar setae proclinate and developed (as long as frontal setae). Frontal vitta black, with silver pruinosity and an inconspicuous golden pruinosity forming a central stripe, at the narrowest point twice wider than width of anterior ocellus ( Fig. 10A View FIGURE 10 ). 19 frontal setae. Fronto-orbital plate black with silver pruinosity. Parafacial bare, brownish-red with silver pruinosity. Frontogenal suture and gena golden pruinose. Gena brownish-red with silver pruinosity ( Fig. 10A View FIGURE 10 ). Pedicel with dorsal seta developed, almost reaching half-length of arista. Postpedicel black, golden pilose.

Thorax. Scutum without vittae, without silver pruinosity on postpronotal and notopleural regions ( Fig. 10B View FIGURE 10 ). Acrostichal setulae triserial presuturally and quadriserial postsuturally. Dorsocentrals 2+3, long, posterior-most postsutural pair developed, twice longer than the others.Prealar 2, anterior twice longer than posterior.Katepisternum with about 15 long and thin setae ventrally ( Fig. 10C View FIGURE 10 ).

Wing. Brownish, with upper third between vein C and vein R 4+5 darker ( Figs 10B, 10C View FIGURE 10 ). Calypters brownish. Haltere brown with stem and base lighter.

Legs. Black, pulvilli brownish and tarsi brown ( Fig. 10D View FIGURE 10 ). Mid femur with 1 row of ad setae; with 1 row of decreasing av from base to apex; 2 rows of long pv, tuft of short v setae on preapical third ( Fig. 10E View FIGURE 10 ). Mid tibia with 2 submedian ad, 1 submedian pd, 1 apical seta on av, pd, p, pv, and v, and 1 long a apical setae twice longer than the others ( Fig. 10E View FIGURE 10 ). Hind coxa with 1 seta on posterior margin. Hind femur strongly curved and flattened dorsoventrally, with pre-apical swelling on v surface, with a tuft of long setae on the swelling, including a set of 3 long av setae and 5 long pv setae (the pv setae slightly thicker), 1 row of ad to d setae, 1 row of pv setae from base to the swelling, a surface with 4 subbasal setae and 1 very long medial seta (3 times longer than width of femur), 1 long preapical av setae, 1 short preapical pd seta ( Fig. 10F View FIGURE 10 ). Hind tibia with 3 median av setae; 1 apical av; 3 median ad; a and ad surfaces covered with a full row of short setae and 1 short a and av apical setae ( Fig. 10F View FIGURE 10 ).

Abdomen. Metallic black-bluish with silver pruinosity, elongate, with developed setae, tergite 5 with long marginal setae (slightly longer than others). Black pruinosity forming a central longitudinal stripe dorsally and transversal stripes apically on tergites (except tergite 5). Syntergosternite with 2 short lateral setae. Sternite 5 rectangular, posterior margin profoundly indented ( Fig. 3E View FIGURE 3 ).

Terminalia. Surstyli fused with epandrium. Surstyli, slightly curved apically, with a medial projection outward directed ( Fig. 4E View FIGURE 4 , 5E View FIGURE 5 ). Bacilliform process long and simple, as long as half of surstyli ( Fig. 4E View FIGURE 4 ). Hypandrial arms directed outwards ( Fig. 6E View FIGURE 6 ).

Female. Unknown.

Etymology. The specific name refers to the two tufts of setae on the ventral swelling of the hind femora.

Type-material. Holotype. Male. Mexico, Tequesquinahuac, C. Tlaloc [19.3987, -98.7085], 15.iv.1982, J. Butze ( CNIN) GoogleMaps . Paratypes. Same as holotype: 1 male ( CNIN); same as holotype, except: 19.iv.1982, 1 male ( CNIN) GoogleMaps .

Distribution. Mexico (State of Mexico).

Remarks. Fannia bisetata and F. arcuata are the unique species of Mexican Fannia pretiosa -group without white-yellowish fore tarsi, but can be easily distinguished by the morphology of the hind femur.