Peradon aurigaster (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 aurigaster (Hull) Figs 2 , 11 , 78 , 79 , 143 , 144 , 161 , 164 , 283

Microdon aurigaster Hull, 1941: 160. Holotype ♂: Bolivia (MCZ) [examined]; Thompson et al. 1976: 63.

Peradon aurigaster (Hull): Reemer and Ståhls (2013a: 160).

Studied type specimens.

Bolivia • 1 ♂, holotype of Microdon aurigaster Hull; Prov. Sara, Steinbach; MCZ.

Label 1: "Bolivia / Prov. Sara / Steinbach"; label 2: "M.C.Z. / Type / 23795"; label 3: "Microdon/ aurigaster / Hull n. sp."; label 4: "Jan. -July 2003 / MCZ Image / database"; label 5: " MCZ-ENT / 00023795". Coll. MCZ.

Additional specimens.

Bolivia • 1 ♂; Mapiri; RMNH.

Brazil • 1 ♀; Pará, Belem; 20 Apr. 1967; Y. Sedman leg.; CNC • 1 ♂; Rondônia, Vilhena; 12°65'55"S, 60°22'18"W; 25 Apr. 2006; J.A. Rafael & F.F. Xavier leg.; INPA • 1 ♂; Dist. Fed. Planaltina, cerrado; 1000 m a.s.l.; 24 Sep.-6 Oct. 1985; Scott E. Miller leg.; USNM (USNMENT01371107) • 1 ♀; Dist. Fed. Planaltina, cerrado; 1000 m a.s.l.; 6-25 Oct. 1985; Scott E. Miller leg.; USNM (USNMENT01371106) • 1 ♀; Mato Grosso; 12°50'S, 51°47'W; 26 Feb. 1968; O.W. Richards leg., R.S. & R.G.S. Exped. B.M. 1968-260; NHMUK • 1 ♀; West border Mato Grosso; May 1931; R.C. Shannon leg.; USNM (red label “Paratype”, see Notes).

Peru • 1 ♀; Tingo Maria, Rio Huallaga; 700 m a.s.l.; Nov. 1947; Weyrauch leg.; CNC • 1 ♀; San Martin, around San Ruque de Cumbaza; 6°23'4.96"S, 76°25'53.47"W; 15-31 Jan. 2015; T. Faasen leg.; RMNH.

Diagnosis.

Body length: male 7.5-9.5 mm, female 9.5-10 mm. The conspicuous golden pile on tergite 4 places this species in the flavofascium species group. Within this group, this species is distinguished by the combination of the following characters: basoflagellomere longer than scape, postpronotum bare, wing cell c bare on posterobasal 1/4 or less, alula largely bare, wing cell r4+5 partly yellow. Male genitalia as in Fig. 283 .

Notes.

A Brazilian female specimen from the USNM collection carries a red label stating “Paratype” (see Additional specimens). As Hull (1941) based his description on a single specimen and does not mention additional material, this specimen cannot be considered a paratype. Variation in colouration in this species is considerable. Based on the present material, it is not possible to assess the taxonomic relevance of this variability, but it seems possible that P. aurigaster as defined here represents a species complex.

Distribution.

Known from Bolivia, Brazil ( Pará, Mato Grosso, Rondônia), and Peru.

Figures

Figures 1, 2. Field images of Peradon species. Both photos were taken in Peru, San Martin, around San Ruque de Cumbaza, 15 - 31. I. 2015, by Tim Faasen 1 P. oligonax male 2 P. aurigaster female.

Figures 9 - 12. 9, 10 Antennal length ratios: 9 Peradon palpator male, basoflagellomere more than twice as long as scape 10 P. bidens male, basoflagellomere less than twice as long as scape 11, 12 Tergites in lateral view: 11 with golden pilosity (Peradon aurigaster male) 12 with silvery white pilosity (P. flavofascium male).

Figures 74 - 85. Wings of Peradon species of the flavofascium - group 74 P. flavofascium ♂ holotype 75 P. flavofascium ♀ 76 P. surinamensis ♂ holotype 77 P. surinamensis ♀ Suriname RMNH 78 P. aurigaster ♂ holotype 79 P. aurigaster ♀ Peru CNC 80 P. ballux ♂ holotype 81 P. brevis ♂ holotype 82 P. notialus ♂ holotype 83 P. notialus ♀ paratype 84 P. chrysopygus ♂ Costa Rica RMNH 85 P. chrysopygus ♀ Belize MZH.

Figures 143 - 148. Dorsal habitus of Peradon species (flavofascium group) 143 P. aurigaster ♂ Bolivia RMNH 144 P. aurigaster ♀ Peru RMNH 145 P. ballux ♂ holotype 146 P. notialus ♂ holotype 147 P. notialus ♀ paratype 148 P. brevis ♂ holotype. Scale bar: 10 mm.

Figures 161 - 164. Peradon aurigaster male holotype 161 habitus dorsal 162 habitus lateral 163 head frontal 164 head lateral.

Figures 280 - 283. Male genitalia of Peradon species 280 P. brevis holotype 281 P. chrysopygus Costa Rica RMNH 282 P. ballux holotype 283 P. aurigaster Bolivia RMNH.