Peradon niger (Williston)

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 niger (Williston) Figs 46 , 123 , 124 , 216 , 217 , 270

Microdon niger Williston, 1891: 4. Holotype ♂: Mexico (NHMUK) [examined]; Thompson et al. 1976: 66.

Microdon manni Shannon, 1923: 80. Holotype ♀: Bolivia (USNM) [examined].

Peradon niger (Williston): Reemer and Ståhls 2013a: 146.

Studied type specimens.

Mexico • 1 ♂, holotype of Microdon niger Williston; Pancina, Vera Paz., Champion"; 1903; F.D. Godman & O. Salvin leg.; NHMUK. Label 1 (small, round, red-bordered): "Holo- / type"; label 2: "Pancina, / Vera Paz. / Champion."; label 3: "Sp. figured."; label 4: "Microdon [male sign] / niger, Will."; label 5: "Biol. Centr. Amer. / Dipt. - Syrphidae. / F.D. Godman, / O. Salvin. / 1903-51.".

Bolivia • 1 ♀, holotype of Microdon manni Shannon; USNM. Label 1: "Ivon Beni / Mann. Bol."; label 2: "W.M. Mann / collector"; label 3 (red): "Type No. / 25951 / U.S.N.M."; label 4: "Microdon / manni / Shannon"; label 5: "= niger Will. / C.T.G."; label 6 (barcode): "USMM ENT 00250236".

Additional specimens.

Mexico • 1 ♂; Chiapas, 6.0 km SW Ocosingo; 22 Sep. 1992; M. Wood leg.; CNC.

Peru • 1 ♀; Madre de Dios, Rio Tambopata Reserve, 30 air km SW Puerto Maldonado; 1-26 Nov. 1982; E.S. Ross leg.; CAS.

Diagnosis.

Body length: male 14.5-15 mm, female 15.5-16 mm. This is a species with a black body and blackish wings with a large whitish apical wing mark. From similarly coloured species ( P. bispina , P. normalis , P. pompiloides ) this species differs by the entirely microtrichose alula.

Notes.

The two specimens from Mexico (including the type of P. niger ) are males, whereas the two specimens from Bolivia (i.e., the type of P. manni ) and Peru are both females. Apart from usual sexual dimorphism, no morphological differences could be found. This supports the synonymization of Microdon manni Shannon with M. niger Williston by Thompson et al. (1976). However, the type localities of these taxa (Bolivia and Mexico, respectively) are far apart, and the types are of opposite sexes. Support for this synonymy would be stronger if males and females of both areas could be compared with each other.

Distribution.

Known from southern Mexico and Amazonian parts of Bolivia and Peru.

Figures

Figures 36 - 47. 36 - 46 Wings of Peradon species of the bidens - group: 36 P. bidens ♂ Suriname RMNH 37 P. bispina ♂ holotype 38 P. aurifascia ♂ holotype 39 P. angustiventris ♂ Suriname RMNH 40 P. angustus ♀ neotype 41 P. flavipennis ♀ holotype 42 P. normalis var. SUR- 17 B ♀ Suriname RMNH 43 P. normalis typical var. ♀ Suriname RMNH 44 P. pompiloides ♂ holotype 45 P. pompiloides ♀ paratype 46 P. niger ♂ holotype 47 Wing of P. palpator ♂ holotype (flavofascium group)

Figures 119 - 128. Dorsal habitus of Peradon species (bidens group) 119 P.? normalis ♂ Brazil Rondonia LACM 120 P. normalis typical morph ♀ French Guiana RMNH 121 P. normalis red morph ♀ Brazil Para LACM 122 P. normalis SUR- 17 b morph ♀ 123 P. niger ♂ holotype 124 P. niger ♀ (holotype M. manni Shannon) 125 P. flavipennis ♀ holotype 126 P. pompiloides ♂ holotype 127 P. pompiloides ♀ paratype 128 P. bispina ♂ Brazil CNC. Scale bar: 10 mm.

Figures 212 - 217. 212 - 215 Peradon luridescens female, holotype: 212 habitus dorsal 213 habitus lateral 214 head frontal 215 head lateral 216, 217 Peradon niger male, holotype: 216 habitus dorsal 217 head frontal.

Figures 268 - 273. Male genitalia of Peradon species 268 P. costaricensis paratype 269 P.? normalis Brazil Rondonia LACM 270 P. niger holotype 271 P. bispina holotype 272 P. pompiloides holotype 273 P. aurifascia Sao Paulo CNC.