Fannia gilvitarsis Chillcott, 1961

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 : 194-196

Fannia gilvitarsis Chillcott, 1961

( Figs 1H , 3F , 4F , 5F , 6F , 11 , 16 )

Diagnosis. Fore tarsi white-yellowish, except for tarsomere 5, with apical half brown and basal half white ( Fig. 11D ). Mid basitarsus swollen ventrally at middle ( Fig. 1H ). Hind coxa bare posteriorly. Hind femur slightly curved with pre-apical swelling on v surface, with a pv tuft with five long setae (twice longer than width of femur) on the swelling ( Fig. 11F ). Wing slightly brownish ( Fig. 11B ).

Redescription. Male. Body length: 6.8 mm. Wing length: 7.1 mm.

Head. Eye short and sparsely setulose. Ocellar triangle black; ocellar setae proclinate and developed (as long as frontal setae). Frontal vitta velvety brownish-red to black with silver pruinosity, at the narrowest point four times wider than width of anterior ocellus ( Fig. 11A ). Frontal setae 15. Fronto-orbital plate black-reddish with silver pruinosity. Parafacial bare, brownish-red with silver pruinosity. Frontogenal suture and gena silver pruinose. Gena brownish-red to black ( Fig. 11A ). Pedicel with dorsal seta developed, with about a third length of arista. Postpedicel black, golden pilose.

Thorax. Scutum without vittae, with inconspicuous silver pruinose on postpronotal and notopleural regions ( Fig. 11B ). Acrostichal setulae triserial presuturally and triserial to quadriserial postsuturally. Dorsocentrals 2+3, long, the posterior-most postsutural pair slightly longer than the others. Prealar 2, short (about a third of posterior notopleural length), the posterior one thinner, both similar in length. Katepisternum with about 10 long and thick setae ventrally ( Fig. 11C ).

Wing. Slightly brownish ( Fig. 11B, 11C ). Calypters white. Haltere brown with stem and base yellow.

Legs. Black, pulvilli brownish and tarsi brown, except for the fore tarsomeres 1–5 which are white-yellowish. Fore tarsomeres 1 and 2 slightly enlarged laterally. Fore tarsomere 5 with a pair of long setulae dorsally (as long as tarsomere 5 width) ( Fig. 11D ). Mid femur with 1 row of ad setae; with 1 row of decreasing av from base to apex; 2 rows of long pv, thicker apically, a tuft of short v setae on preapical third ( Fig. 11E ). Mid tibia with 1 submedian ad, 1 median pd, 1 strong and long preapical d, 1 apical seta on a, pd, p, pv, and v (v longer, similar to d preapical seta) ( Fig. 11E ). Mid basitarsus slightly enlarged ventrally ( Fig. 1H ). Hind coxa bare on posterior margin. Hind femur 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, 1 row of ad to d setae, pd to pv rows of setae from the femur base to the pre-apical swelling, 1 long preapical av setae, 1 short preapical ad and pd ( Fig. 11F ). Hind tibia with 2 submedian av setae; 1 apical av ( Fig. 11F ).

Abdomen. Metallic black-bluish with silver pruinosity, elongate, with developed setae, tergite 5 with long marginal setae (about twice longer than others). Black pruinosity forming a central narrow longitudinal stripe dorsally. Syntergosternite with 3 long lateral setae, not longer than sternite 5. Sternite 5 quadrangular, posterior margin profoundly indented ( Fig. 3F ).

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

Female. Unknown.

Material examined. Mexico. Hidalgo. Parque Ecológico El Chico, Mineral de Chico , 20°10′58′′N, 98°43′04′′W, trampa aérea 3, 9.vi-16.vii.2019, Nuple, E., 1 male ( CNIN) ; same label information except:trampa aérea5, 16.vii.2019, 1 male ( CARF, CPL2927 ) ; trampa aérea 6, 16.vii.2019, 1 male ( CARF, CPL2944 ) . Mexico. Tequesquinahuac, C. Tlaloc [19.3987, -98.7085], 15.iv.1982, G. Sampedro, 2 males ( CNIN) . Tlaxcala. Nanacamilpa, Piedra Canteada , 19°27′23′′N, 98°36′01′′W, 13.vii.2019, Nuple, E., 1 male ( CARF, CPL2926 ) .

Distribution. Mexico (Hidalgo, State of Mexico, Tlaxcala).

Remarks. Fannia gilvitarsis is a unique species with fore tarsomere 5 yellow basally and brown apically. This species was only known by the original description ( Chillcott, 1961) with a record from State of Mexico. We present new records from Hidalgo and Tlaxcala states.

Figures

FIGURE 1. Fannia amplitarsis sp. nov., anterior apical seta of mid tibia ⅔ the length of basitarsus (black triangle), anterodorsal view (A); Fannia arcuata, anterior apical seta of mid tibia 1/2 length of basitarsus (black triangle), anterodorsal view (B); Fannia amplitarsis sp. nov., hind coxa with two posterior setae (white triangle), posterior view (C); Fannia anguliseta sp. nov., hind coxa bare posteriorly (white triangle), posterior view (D); Fannia anguliseta sp. nov., syntergosternite with 2 pairs of curved lateral setae twice longer than sternite 5 (white triangle), lateral view (E); Fannia pedregalensis sp. nov., syntergosternite without any curved lateral setae longer than sternite 5 (white triangle), lateral view (F); Fannia grisalesae sp. nov., mid basitarsus with the basal fourth enlarged and covered with four long and thick curved setae (black triangle), lateral view (G); Fannia gilvitarsis, mid basitarsus enlarged ventrally (black triangle), lateral view (H). Scale: 0.5 mm.

FIGURE 3. Fannia, male, sternite 5, ventral view: F. abdominiseta sp. nov. (A); F. amplitarsis sp. nov. (B); F. anguliseta sp. nov. (C); F. arcuata (D); F. bisetata sp. nov. (E); F. gilvitarsis (F); F. grisalesae sp. nov. (G); F. pedregalensis sp. nov. (H). Scale: 0.1 mm.

FIGURE 4. Fannia, male, epandrium, cerci and surstyli, posterior view: F. abdominiseta sp. nov. (A); F. amplitarsis sp. nov. (B); F. anguliseta sp. nov. (C); F. arcuata (D); F. bisetata sp. nov. (E); F. gilvitarsis (F); F. grisalesae sp. nov. (G); F. pedregalensis sp. nov. (H). Scale: 0.1 mm.

FIGURE 5. Fannia, male, epandrium, cerci and surstyli, lateral view: F. abdominiseta sp. nov. (A); F. amplitarsis sp. nov. (B); F. anguliseta sp. nov. (C); F. arcuata (D); F. bisetata sp. nov. (E); F. gilvitarsis (F); F. grisalesae sp. nov. (G); F. pedregalensis sp. nov. (H). Scale: 0.1 mm.

FIGURE 6. Fannia, male, aedeagus and associates structures, dorsal view: F. abdominiseta sp. nov. (A); F. amplitarsis sp. nov. (B); F. anguliseta sp. nov. (C); F. arcuata (D); F. bisetata sp. nov. (E); F. gilvitarsis (F); F. grisalesae sp. nov. (G); F. pedregalensis sp. nov. (H). Scale: 0.1 mm.

FIGURE 11. Fannia gilvitarsis. Male: head, frontal view (A); habitus, dorsal view (B); habitus, lateral view (C); fore tarsi (D); mid leg, anterior view (E); hind leg, anterior view (F). Scale: 1.0 mm.

FIGURE 16. Distribution map of Fannia pretiosa-group (sensu Chillcott 1961) species from Mexico. Black lines (borders of Mexico states). Purple region (Sierra Madre del Sur province), yellow region (Sierra Madre Oriental province), red region (Transmexican Volcanic Belt province), orange region (Chiapas Highlands province) (sensu Morrone et al. 2022).