Peradon pompiloides 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 pompiloides Reemer sp. nov. Figs 44 , 45 , 55 , 60 , 65 , 126 , 127 , 235 , 237 , 272

Peradon SUR-18 of Reemer 2014: 47.

Type material.

Holotype. Ecuador • 1 ♂, holotype of Peradon pompiloides sp. nov.; Napo, Jatun Sacha Res., 6 km E Misahualli; 1°4'S, 77°37'W; 450 m a.s.l.; 30 Apr.-8 May 2002; S.A. Marshall leg.; DEBU. Label 1: "ECU [Ecuador]: Napo, Jatun Sacha / Res., 6 km E. Misahualli, 450 / m. 1°4'S, 77°37'W, SOL / trail, 30 Apr– 8 May 2002, / S.A. Marshall, / debu00179136".

Paratype. Brazil • 1 ♀; "Amazon 66 53"; NHMUK.

Additional specimens.

Suriname • 1 ♂; "Amer. mer. Surinam"; RMNH.

Description

(based on holotype). Adult male. Body size: 9.5 mm.

Head. Face occupying 0.43 of head width in frontal view; yellow; 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 pilosity, except black pilosity at ocellar triangle. Occiput black with pale golden yellow pilosity dorsally, white pilosity ventrally. Eye bare. Antennal fossa slightly wider than high. Antenna black, except scape brown basally. Antennal ratio approximately 1:1.4. Basoflagellomere parallel-sided with rounded apex. Arista slender, ca. 2/3 of length of basoflagellomere.

Thorax. Mesoscutum dull black with faint bronze hues on wide areas along all margins; short, appressed black pilose, except for fasciae of more erect golden yellow pile along anterior and posterior margins. Postpronotum pale brown; pale yellow pile. Postalar callus dark brown; black pile. Scutellum dark brown with faint bronze hue; pale yellow pilose anteriorly, black pilose posteriorly; with two apical calcars of approx. 1/4 of length of scutellum, with mutual distance ca. the same as length of scutellum. Pleura blackish brown. Anterior and posterior part of anepisternum separated by deep sulcus; golden yellow and black pile anteriorly, yellow pilose along posterior margin, with wide bare area in between. Anepimeron entirely white pilose. Katepisternum white pilose dorsally, bare ventrally. Katatergum and anatergum dark microtrichose. Other pleurae bare. Calypter grey. Halter yellow.

Wing. Blackish anterobasally and dark grey otherwise, except for yellow subapical macula in parts of cells r1, r2+3, r4+5 and apex of dm. Wing microtrichose, except bare on basal 50% of alula.

Legs. Blackish brown; yellow to white pile, except fore and mid femora black pile anteriorly, and hind femora black pilose posteriorly.

Abdomen. Elongate, widest at apex of tergite 2; black; short black pilose, except longer yellowish to white pilose on following parts: posterior part of tergite 1, anterior margin and anterolateral corners of tergite 2, lateral margins of tergite 3 and most of tergite 4. Sternites blackish brown; black pilose, except sternite 1 bare.

Female (based on paratype from Brazil, Amazon region). As male, except for following differences. Body size: 12 mm. Tergite 5 with large anteromedian triangular patch of grey pruinescence ( Fig. 55 ).

Diagnosis.

Body length: male 9.5-11.5 mm, female 12 mm. This is a slender, black species with infuscate wing and a subapical yellow wing mark. It can be separated from similar species by the partly bare alula, entirely microtrichose cell br, yellow wing marking situated in apical parts of cells r4+5 and r2+3.

Notes.

The male specimen from Suriname differs from the male holotype by its longer body (11.5 mm) and the less extensive yellow wing marking. This specimen is here considered as a colour variety of P. pompiloides , but this should be re-assessed if additional material becomes available.

Distribution.

The species is known from the Brazilian Amazon, Ecuador, and Suriname.

Etymology.

The specific epithet is an adjective derived from the noun pompilus, literally meaning ' pompilus - like’. The name is inspired by the resemblance of this species to certain Neotropical spider wasps ( Hymenoptera : Pompilidae ).

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 53 - 56. Tergite 4 of Peradon females 53 P. normalis typical variation (without grey pruinescence), French Guiana RMNH 54 P. normalis red variation (without grey pruinescence), Brazil LACM 55 P. pompiloides paratype (with large basomedian patch of pruinescence) 56 P. cf. sciarus (with large basal area of pruinescence) Peru CSCA.

Figures 57 - 60. Tergite 2 - 3 of Peradon females in frontodorsal view 57 P. normalis typical morph, French Guiana RMNH 58 P. normalis red morph Brazil LACM 59 P. normalis SUR- 17 b morph Suriname RMNH 60 P. pompiloides paratype. Note the similar pattern of grey pruinescence on tergite 3 in all three colour morphs of P. normalis, with pruinescence limited to anterior 1 / 3 of tergite 3. In contrast, the grey pruinescence in P. pompiloides extends over a large part of tergite 3.

Figures 61 - 66. 61, 62 Wing cell bm: 61 P. bidens 62 P. costaricensis 63, 64 Mesonotal transverse fascia: 63 medially interrupted (P. bidens) 64 complete (P. costaricensis) 65, 66 Wing cell br: 65 P. pompiloides (holotype) 66 P. normalis (Suriname RMNH).

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 232 - 234. 232 - 234 Peradon palpator male, holotype 232 habitus lateral 233 head frontal 234 head lateral 235 - 237 Peradon pompiloides male, holotype 235 habitus lateral 236 head frontal 237 head lateral 238 - 239 Peradon pompiloides female paratype 238 habitus lateral 239 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.