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Fannia bisetata sp. nov. (Figs 3E, 4E, 5E, 6E, 10, 16) Diagnosis. Fore tarsi brown (Fig. 10D). 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). 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). 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). 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). 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). Wing. Brownish, with upper third between vein C and vein R 4+5 darker (Figs 10B, 10C). Calypters brownish. Haltere brown with stem and base lighter. Legs. Black, pulvilli brownish and tarsi brown (Fig. 10D). 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). 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). 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). 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). 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). Terminalia. Surstyli fused with epandrium. Surstyli, slightly curved apically, with a medial projection outward directed (Fig. 4E, 5E). Bacilliform process long and simple, as long as half of surstyli (Fig. 4E). Hypandrial arms directed outwards (Fig. 6E). 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). Paratypes. Same as holotype: 1 male (CNIN); same as holotype, except: 19.iv.1982, 1 male (CNIN). 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.
Published as part of 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, pp. 185-204 in Zootaxa 5264 (2) on pages 193-194, DOI: 10.11646/zootaxa.5264.2.2, http://zenodo.org/record/7836396 |
