Peradon trilinea (Hull)

Reemer, Menno, Skevington, Jeffrey H. & Kelso, Scott, 2019, Revision of the Neotropical hoverfly genus Peradon Reemer (Diptera, Syrphidae, Microdontinae), ZooKeys 896, pp. 1-93 : 1

Peradon trilinea (Hull) Figs 17 , 23 , 25 , 27 , 100 , 101 , 252-254 , 259

Microdon trilinea Hull, 1943: 710. Holotype ♂: Amazon (NHMUK) [examined]; Thompson et al. 1976: 67.

Peradon trilinea (Hull): Reemer and Ståhls 2013a: 146.

Studied type specimens.

Amazon Region • 1 ♂, holotype of Microdon trilinea Hull; NHMUK.

Label 1 (small, round, red-bordered): "Holo- / type"; label 2: "Amazon / 66 53"; label 3 (red): "Holotype / Microdon / trilinea / Hull".

Additional specimens.

Peru • 1 ♀; Pucallpa; 19 Apr. 1962; J. Schunke leg.; NHMUK.

Diagnosis.

Body size: male 13 mm, female 15 mm. The triangle of golden pile on the mesoscutum place this species in a group together with P. aureus , P. aureoscutus and P. trivittatus . From the first two species, P. trilinea differs by the presence of golden pile along the anterior and lateral margins of the mesoscutum. The male differs from P. trivittatus by tergite 2 being parallel-sided (widened posteriorly in P. trivittatum ), and by the presence of a bulge-like, long pilose, median tubercle on the anterior 1/3 of sternite 4 ( Fig. 25 ) (sternite 4 evenly convex and short pilose in P. trivittatus ). Male genitalia as in Fig. 259 . The female differs from P. trivittatus by the strongly arched sternite 3, with a wide yellowish membrane between its posterior margin and the straight anterior margin of tergite 4 ( Fig. 27 ).

Notes.

The examined female from Peru is associated with the male holotype because of the shape of tergite 2 (flatter and more parallel-sided than in P. trivittatus ), and because of the modified sternite 3 (unmodified in P. trivittatus ).

Distribution.

Know from the Brazilian Amazon and eastern Peru.

Figures

Figures 13 - 18. 13 - 15 Mesoscutum: 13 Peradon aureoscutus male holotype 14 P. aureus male Ecuador CNC 15 P. trivittatus male French Guiana RMNH 16 Peradon fenestratus, scutellum lateral 17, 18 Tergites 2 and 3: 17 Peradon trilinea male holotype 18 P. aureus male holotype.

Figures 19 - 24. 19, 20 Head dorsal: 19 Peradon aureoscutus male holotype (HW = head width, VW = vertex width) 20 P. aureus male Ecuador CNC 21 - 24 Tergite 2 dorsal: 21 Peradon aureoscutus male holotype 22 P. aureus male Ecuador CNC 23 P. trilinea male holotype 24 P. trivittatus male French Guiana RMNH.

Figures 25 - 27. Sternite 4 ventrolateral 25 Peradon trilinea male holotype (note anterior bulge) 26 P. trivittatus male French Guiana RMNH 27 Peradon trilinea female, sternites in ventral view (note wide membranous part between sternites 3 and 4).

Figures 97 - 104. Dorsal habitus of Peradon species (trivittatus group) 97 P. trivittatus ♂ Suriname RMNH 98 P. trivittatus ♀ Suriname RMNH 99 P. fenestratus ♀ Brazil INPA 100 P. trilinea ♂ holotype 101 P. trilinea ♀ Peru NHMUK 102 P. aureus ♀ holotype 103 P. aureus ♂ Ecuador CNC 104 P. aureoscutus ♂ holotype. Scale bar: 10 mm.

Figures 252 - 255. 252 - 254 Peradon trilinea male, holotype: 252 habitus lateral 253 head frontal 254 head lateral 255 Peradon trivittatus male holotype: habitus dorsal.

Figures 256 - 261. Male genitalia of Peradon species 256 P. fenestratus French Guyana MNHN 257 P. aureoscutus holotype 258 P. aureus Ecuador CNC 259 P. trilinea holotype 260 P. trivittatus Suriname RMNH 261 P. hermetia holotype.