Dolichophaonia trigona ( Shannon & Del Ponte, 1926 )

Patitucci, Luciano Damián, Mulieri, Pablo Ricardo, Olea, Maria Sofia & Mariluis, Juan Carlos, 2013, Muscidae (Insecta: Diptera) of Argentina: revision of Buenos Aires province fauna, with a pictorial key to species, Zootaxa 3702 (4), pp. 301-347 : 327-328

Dolichophaonia trigona ( Shannon & Del Ponte, 1926)

( Figs. 21 , 52–57 , 61 )

Redescription.

Male. Length. Body: 5.94–7.29 mm, Wing: 5.40–7.41 mm.

Head: Black with gray pollinosity. Front at vertex one-fifth of head width, anterointernal ommatidia enlarged with short hairs. Frontal row with 8-10 pairs setae distributed evenly between the lunule and the base of the ocellar triangle. Fronto-orbital seta absent. Frontal vitta black; lunule brown; fronto-orbital plate, parafacial, gena, postgena, and occiput black with gray pollinosity. Gena with black setae. Inner vertical setae convergent and outer vertical setae divergent. Antenna brown; in lateral view inserted at the mid-level of the eye; arista plumose. Palpus brown, filiform.

Thorax. Scutum black with three gray pollinose vittae; scutellum, anepisternum, anepimeron, katepimeron, katepisternum, proepisternum, proepimeron and meron black with gray pollinosity; anterior and posterior spiracles gray. Chaetotaxy: acrostichals 0+1; dorsocentrals 2+3; postpronotals 2; intra-alars 1+2; supra-alars 1+2; notopleurals 2, the posterior one shorter, notopleuron bare. Prealar seta short and strong. Scutellum with basal, apical, and discal pairs of setae. Anepisternum with a series of 6-8 strong setae; katepisternals 1+2; anepimeron, katepimeron and meron bare; proepisternals 1 strong and 3 thinner; proepimerals 2. Prosternum bare.

Wing. Hyaline, veins brown without setae, with a brown spot on r-m and two on dm-cu; the transverse crossvein dm-cu strongly curved; vein R4+5 and vein M straight. Upper calypter hyaline with brown margin; lower calypter glossiform, hyaline with white margin; halter yellow.

Legs. Femora brown with gray pollinosity, distal part yellow-brown, tibia yellow-brown, tarsi dark brown; pulvilli yellow. Fore femur with rows of dorsal, posterodorsal, and posteroventral setae; fore tibia without setae, except for one preapical anterodorsal, dorsal, and posteroventral setae. Mid femur with 3 strong setae in the basal two-thirds on ventral surface; and 3 preapical setae on anterodorsal to posterior surface; mid tibia with 2 posterodorsal setae and 4 apical setae (anterodorsal, posteroventral, ventral, and anteroventral). Hind femur with anteroventral row of setae; hind tibia with 2 short setae on medial third of anterodorsal suface and 1 short setae on medial third of anteroventral suface; calcar strong.

Abdomen. Gray, with black spots. Sternite 1 bare. Sternite 5 dark brown, yellow -brown at the posterior part, setulose, with two strong setae, the posterior margin membranous with two projections, and anterior margin slightly curved ( Fig. 52 ).

Terminalia. Cercal plate with a deep upper incision at the anterior and at the posterior margins, and with setae on dorsal surface ( Fig. 53 ). Aedeagus with aedeagal apodeme slightly curved and strongly sclerotized; paramere and gonopod with short setulae; aedeagus sclerotized on posterior surface ( Fig. 54 ).

Female. Length. Body: 6.50–7.87 mm, Wing: 5.50–6.98 mm.

Differs from male as follows: interocular space about one-third of head width at level of anterior ocellus; fronto-orbital plate setulose with 2 reclinate orbital seta. Fronto-orbital plate setulose.

Terminalia. Ovipositor short, intersegmental membrane with microtrichiae. Tergites 6 and 7 sclerotized without plates; tergite 8 laterally sclerotized; epiproct triangular with setulae on distal margin, cercus digitiform ( Fig. 55 ). Sternites 6 slightly sclerotized with setulae on distal margin; sternite 7 sclerotized triangular plate; sternite 8 strongly sclerotized; hypoproct campanulate ( Fig. 56 ). Three spermathecae ( Fig. 57 ).

Material examined. ARGENTINA : BUENOS AIRES: 2 males, Arroyo Tuyuparé, 25-I-1908, Brèthes leg. ( MACN); 1 female, Delta del Paraná, 15-VIII-1975, Oliva leg. ( MACN); 1 female, Punta Lara, 11- VI-1951. Blanchard. leg. ( MACN); 3 females, 4 males, RNEO, Campana, 26-XI-2009, Patitucci leg. ( MACN).

Distribution in Argentina ( Fig. 61 ): Buenos Aires; Entre Rios.

References for Argentina . Löwenberg-Neto et al. (2011); Patitucci et al. (2011b); Shannon & Del Ponte (1926).

Remarks. This species was briefly described by Shannon & Del Ponte (1926), therefore we provided in this work a redescripton with the male and female terminalia.

Biology. Unknown. The specimens studied in this work were collected on vegetation with a hand net (LDP).

Figures

FIGURES 21 – 23. 21. Dolichophaonia trigona, lateral view, with detail of cross-vein dm-cu. 22. Muscina stabulans, lateral view, with detail of M vein. 23. Helina nivaloides, lateral view, with detail of M vein.

FIGURES 52 – 57. Dolichophaonia trigona. Male. 52. Sternite 5. 53. Cercal plate, dorsal view. 54. Aedeagus, lateral view. Scale bar = 0.5 mm. Female. 55. Terminalia, dorsal view. 56. Terminalia, ventral view. Scale Bar = 1 mm. 57. Spermathecae. Scale bar = 0.1 mm. Abbreviations: aed: aedeagus; aed apod: aedeagal apodeme; epiph: epiphallus; gon: gonopod; pm: paramere.

FIGURES 61 – 65. Geographic distribution in Argentina. 61. Dolichophaonia trigona. 62. Helina nivaloides. 63. Phaonia trispila. 64. Graphomya auriceps. 65. G. maculata. Black dots: new records; gray squares: previous distribution; grey stars: province record (inexact data). Buenos Aires province is denoted in blue.