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Downeshelea casimirensis sp. nov. (Figures 2a–d, 8c–e, 10) Diagnosis Male. The only species of Downeshelea in the Americas with the following combination of features: gonostylus 0.81 length of gonocoxite; parameres fused for 0.19 of total length; stem straight, gradually swollen to apex; distal portion strongly curved (Figure 8e); aedeagus subtriangular, heavily sclerotised laterally on proximal 2/3, with a pair of submedian, longitudinal sclerotised stripes and oval areas, basal arch V-shaped, extending to 0.56 of total length (Figure 8d). Female. Unknown. Description Male. Head. Eyes slightly contiguous in lower area; antennal ratio 0.91 (Figure 2c); palpal ratio 2.0 (Figure 2b). Thorax. Brown, without definite pattern in slide-mounted specimens. Wing (Figure 2a) with greyish spot over CuA 2 extending into cua 1, anal cell, reaching wing margin; 2 nd radial cell twice longer than 1 st; wing length 0.85 mm; breadth 0.35 mm; costal ratio 0.70. Halter pale brown. Legs (Figure 2d) pale brown, hind femur slightly darker subapically. Fore-, hind tarsomere 1 with one basal, one apical spine; midtarsomere 1 with two basal, two apical, four other ventral spines; apical spines of tarsomeres 2–4 of fore-, mid-, hind legs: 1–1–1; 2–2–1; 1–1–1; fore tarsal ratio 2.31, mid tarsal ratio 2.45, hind tarsal ratio 2.14; claws 0.35 length of their respective tarsomere 5. Abdomen. Dark brown. Terminalia (Figure 8c): tergite 9 with quadrate apex, apicolateral process elongate, slender; sternite 9 slightly concave anteriorly, posterior margin with large convex median lobe with blunt tip bearing 3 long setae. Gonocoxite 2.41 times longer than basal width; gonostylus long, 0.81 length of gonocoxite. Parameres (Figure 8e) 1.10 times longer than aedeagus, fused for 0.19 of total length; knob flattened; stem straight, gradually swollen to apex; distal portion strongly curved, 0.53 of total length. Aedeagus (Figure 8d) subtriangular, heavily sclerotised laterally on proximal 2/3, basal arch V-shaped, extending to 0.56 of total length with pair of submedian, longitudinal sclerotised stripes and oval areas; distal portion with a deep mesal excavation terminating in two short, slender, sclerotised, slightly serrate processes with pointed tip. Female. Unknown. Specimens examined Holotype male adult, labeled ‘ Holotype Downeshelea casimirensis Santarém, Borkent, Spinelli and Felippe-Bauer, BRAZIL, Rio de Janeiro, Casimiro de Abreu, Union Biological Reserve (22° 25′ 35″ S, 42° 2′ 4″ W), 28 April-17 May 2013, Malaise, Biota Diptera Fluminense team cols.’ (CCER). Distribution and bionomics This species is restricted to forests in the Brazilian State of Rio de Janeiro (Casimiro de Abreu municipality) (Figure 10). Etymology This species is named after the type locality at Casimiro de Abreu, municipality of Rio de Janeiro State. |
