Fannia puxcu, Domínguez, M. Cecilia & Aballay, Fernando H., 2014

Domínguez, M. Cecilia & Aballay, Fernando H., 2014, An updated key to the species of Fannia Robineau-Desvoidy (Diptera: Fanniidae) of Southern South America, and the description of a new species from Mendoza, Argentina, Zootaxa 3795 (2), pp. 152-160 : 153-156

Fannia puxcu sp. n.

( Figs. 2–5 )

Etymology. The species name “ puxcu ”, which means ”sister” in the indigenous huarpe language (specifically in the allentiac dialect), is a reference to the morphological similarity of this species with F. fusconotata and also to F. puxcu and F. fusconotata ’s overlapping geographic distribution.

Type material examined. Holotype male, Argentina: Mendoza: Las Heras, Reserva Villavicencio (32º31’15,5’’S; 69º0’28, 9’’W); 1680 m. Paratypes: 9 males, same data as holotype. IADIZA.

Distribution. The species is only known from the type-locality.

Diagnosis: Small yellow and grey species very similar to F. fusconotata and F. benjamini . Frontal vitta at narrowest point reduced to a thin line. Eyes bare. Parafacial bare. Antennae light brown. Palpi brownish yellow. Thorax grey-brown, thin brown vittae visible in full length of acr and between dc and ia, but not present at base of scutellum. Two strong pra near spal. T2 constricted in basal half. F3 lacking preapical posteroventral protuberance.T3 lacking medial row of ad. Wings clear. Halteres yellowish-white. Abdomen heart-shaped, greybrown in ground colour, heavily yellow pruinose on laterals of tergites 2–4.

Male: body length 3.1–3.4 mm

Head. Frontal vitta black to silvery, at narrowest point reduced to a thin line. Fronto-orbital plate heavily silvery grey pruinose, at uppermost pair of fr 2x width of anterior ocellus. Six to seven fr, slightly shorter than flagellum. Eyes bare, antero-internal facets 2x diameter of remaining; pocl of uniform length as opposed to having a long followed by a short seta. Face and parafacial silvery grey; parafacial at base of flagellum 0.6x width of same and bare. Facial carina dark grey. Genae grey. Scape light brown, pedicel and flagellum brownish yellow; flagellum short and broad 1.2 to 1.7x as long as broad, heavily silvery grey pruinose. Arista light brown at base, and short pubescent. Palpi brownish yellow, slightly spatulated, the apex 2x width of base. Lower oral margin, slightly concave and grooveless.

Thorax: Scutum grey, thin brown vittae visible in full length of acr and between dc and ia, but not present at base of scutellum; pleura grey; 3+3 acr, 1 pair of prescutellar acrs; 2+3 dc; pprn lacking setulae; 2 strong pra near spal; prealar area bare; 2 prepm, lacking surrounding setulae.

Legs: Coxae brown, trochanters yellow, femora brown; tibiae completely yellow, tarsi dark-brown to black. F1 normal (length/width = 5); 1 row of pd as long as femoral width; 2 rows of p as long as femoral width; 1 row of pv short in apical fourth but 4 to 6 longer pv at apex. T1 with 1 subapical pd; 1 apical v and pv; 1 submedial and 1 apical ad. Fore tarsomere 1 0.3x length of fore tibia, tarsomeres 4 and 5 as wide as long. F2 with 1 row of weak ad; 2 rows of short a, one in full length and other in medial 1/3; with 1 row of av sparse at base, denser and shorter at apex; 2 rows of pv, upper row as long as femoral width and lower short at base, longer at apex; 1 row of p longer and ventrally directed at apex. T2 constricted in basal half. Ventral pubescence sparse, as long as 0.5x femoral width; 1 submedial and 3 apical a; 1 subapical ad; 1 strong apical av -v; 1 submedial and 1 apical pd; 1 apical pv and p. C3 bare at apex of posterior margin. F3 normal (length/width = 5.5), lacking preapical posteroventral protuberance; 1 row of ad longer and ventrally directed towards apex; 1 row of long and hair- like av, and 2 preapical av longer than femoral width; with a row of very short setulose pv ( Fig. 2 ). T3 with 1 submedial and 1 subapical d; 1 submedial and 1 apical ad, lacking medial row; 2 to 3 medial and 1 apical short av; apex of ventral and posteroventral surface with a weak ctenidium.

Wings: Clear. Lower calypter oval, upper rounded, both white. Knob of halteres yellowish-white, light brown at base.

Abdomen: Heart-shaped, tergite 2 over 2x width of tergite 4. Grey-brown in ground colour, heavily yellow pruinose on laterals of tergites 2–4. Hypopygium not protruding.

Postabdomen: Posterior margin of sternite 5 profoundly indented and covered with setae ( Fig. 3 ). Hypandrial arms directed outwards and expanded at apex; postgonites inconspicuous; aedeagus membranous ( Fig. 4 ). Epandrium slightly broadened at posterior margin; cercal plate fused, slightly bilobated at base; bacilliform process cork-screw shaped; surstily long and simple, marginal respect to epandrium ( Figs. 5 , 6).

Female (unknown).

Figures

FIGURES 1 – 5. 1. Fannia fusconotata Rondani: male hind leg, posterior. 2 – 5. Fannia puxcu sp. n.: male hind leg, posterior (2); male sternite 5, ventral (3); male hypandrium (4) male genitalia external structures, ventral (5); male genitalia external structures, lateral (6).