Peradon surinamensis Reemer

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 surinamensis Reemer sp. nov. Figs 76 , 77 , 87 , 89 , 91 , 93 , 139 , 140 , 246-251 , 278

Microdon flavofascium Curran: Van Doesburg 1966: 80.

Peradon flavofascium (Curran): Reemer 2014: 43.

Type material.

Holotype. Suriname • 1 ♂, holotype of Peradon surinamensis sp. nov.; Coppename River, Raleigh Falls; 16 Jul. 1963; P.H. van Doesburg Jr. leg; RMNH. Label 1: "Suriname / Coppename Riv. / Raleigh Falls / 16 July 1963 / P.H. v. Doesburg Jr."; label 2: "Microdon [male symbol] / flavofascium Curr. / det. v. Doesburg"; label 3: "Peradon / cf. flavofascium / Det. M. Reemer 2016 / Voucher code MR033".

Suriname • 1 ♀, paratype of Peradon surinamensis sp. nov.; Distr. Brokopondo, Brownsberg N.P., Witti Kreek; 20 Jul. -3 Aug. 2001; N. Grol & N. Marseille leg.; RMNH •1 ♀, paratype of Peradon surinamensis sp. nov.; Distr. Para, Colakreek, 5 km SE Zanderij; 05°27'58"N, 55°13'47"W; 1 Mar. 2006; M. Reemer leg.; RMNH.

Additional specimens.

Brazil • 1 ♀; Rondonia, Vilhena; 13 Nov. 1986; C. Elias leg.; UFPR; 1 ♀; Amazonas ["Amazon / 66 53"]; NHMUK.

Description

(based on holotype). Adult male. Body size: 8 mm.

Head. Face occupying approximately 0.45 of head width in frontal view; black except for pale yellow, oblique yellow maculae ventrolaterally; with white pilosity. Gena black; with white pilosity. Lateral oral margin weakly produced; black; with white pilosity. Frons and vertex black; with pale golden yellow pile pilosity. Occiput black; with pale golden yellow pilosity dorsally, white pilosity ventrally. Eye bare. Antennal fossa ca. as wide as high. Antenna brown. Ratio of scape:basoflagellomere approximately 1:1.1. Basoflagellomere parallel-sided with rounded apex. Arista slender, approx. 2/3 of length of basoflagellomere.

Thorax. Mesoscutum dull black; short black pile, except for narrow fasciae of short pale golden yellow pile along anterior and posterior margin and transverse suture. Postpronotum brown; bare. Postalar callus blackish brown; yellow pilose. Scutellum black with faint blue green metallic shine, posterior margin yellow; white pilose; with two apical calcars of approx. 1/5 of length of scutellum, with mutual distance approximately equal to length of scutellum. Pleura blackish brown. Anterior and posterior part of anepisternum separated by deep sulcus; white pilose anteriorly and posteriorly, with wide bare area in between. Anepimeron entirely whitish pilose. Katepisternum white pile dorsally, bare ventrally. Other pleura bare (except for microtrichia). Calypter and halter yellow.

Wing. Hyaline, except for pale yellow macula in basal half of cell r4+5, which anteriorly extends into cell r2+3 and posteriorly into cell dm; somewhat infuscated around crossvein r-m and posterior appendix of vein R4+5. Wing microtrichose, except bare on basal 1/2 of cell c, basal 1/4 of r1, basal 3/4 of br, basal 4/5 of bm, anterobasal 1/3 of cup, and most of alula (only microtrichose along margins).

Legs. Shining brown; white pilose, except tarsi ventrally golden yellow pilose.

Abdomen. Elongate, widest at apex of tergite 2, tergite 3 parallel-sided; blackish brown, tergite 4 somewhat paler; tergite 1 white pile; tergites 2 and 3 short black pile, except for longer silvery white pile laterally; tergite 4 silvery white. Sternites brown; white pile, except sternite 1 bare. Genitalia as in Fig. 278 .

Female. As male, except for following differences. Body length 9 mm. Vertex black pilose medially. Pale wing macula a little more extensive anteriorly and posteriorly, and infuscation around crossvein r-m and posterior appendix of vein R4+5 more pronounced. Tergite 5 silvery white pilose.

Diagnosis.

Body length: male 8 mm, female 9-10.5 mm. A rather small species of Peradon with a yellow macula in the wing, silvery white pile on tergite 4 (and 5 in the female) and a bare postpronotum. These three characters are only shared with P. flavofascium , from which it differs as follows: alula only narrowly microtrichose along margins (bare for maximally 30% in P. flavofascium ), male with yellow wing macula extending to posterior part of cell r2+3 anteriorly, female with face occupying 0.45 of head width. See key for additional characters.

Distribution.

The species is known from Suriname, the Brazilian state Rondonia and an unknown locality in the Brazilian Amazon region.

Etymology.

The specific epithet is an adjective referring to Suriname, the country of origin of the type specimens.

Figures

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 86 - 89. 86, 87 Heads in frontal view: 86 P. flavofascium female (Brazil MZUSP) 87 P. surinamensis female (paratype) 88, 89 Heads in lateral view: 88 P. flavofascium female (Brazil MZUSP) 89 P. surinamensis female (paratype).

Figures 90 - 96. 90, 91 Scutellum: 90 P. flavofascium male (holotype) 91 P. surinamensis male (holotype) 92 - 96 Mesonotum: 92 P. flavofascium female (Brazil MZUSP) 93 P. surinamensis female (paratype) 94 P. notialus male (holotype) 95 P. ballux male (holotype) 96 P. brevis male (holotype).

Figures 136 - 142. Dorsal habitus of Peradon species (flavofascium group) 136 P. palpator ♂ holotype 137 P. palpator ♀ paratype 138 P. flavofascium ♂ Brazil MZUSP 139 P. surinamensis ♀ paratype 140 P. surinamensis ♂ holotype 141 P. chrysopygus ♂ Costa Rica LACM 142 P. chrysopygus ♀ Costa Rica LACM. Scale bar: 10 mm.

Figures 246 - 251. 246 - 248 Peradon surinamensis male, holotype: 246 habitus lateral 247 head frontal 248 head lateral 249 - 251 Peradon surinamensis female paratype: 249 habitus lateral 250 head frontal 251 head lateral.

Figures 274 - 279. Male genitalia of Peradon species 274 P. luridescens Suriname RMNH 275 P. angustiventris Suriname RMNH 276 P. palpator holotype 277 P. flavofascium holotype 278 P. surinamensis holotype 279 P. notialus holotype.