Peradon brevis 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 brevis Reemer sp. nov. Figs 81 , 96 , 148 , 174-176 , 280

Type material.

Holotype. Ecuador • 1 ♂, holotype of Peradon brevis sp. nov.; "Pr. Mor. -S."; 900 m a.s.l.; 18 Aug. 1982; R. Hensen & A. Aptroot leg.; RMNH. Label 1: "ECUADOR; Pr. Mor. -S.; / Palora; 900 m; / Leg. R. Hensen et A. / Aptroot; 18-8-1982"; label 2: "Peradon sp. 04 [male symbol] / Det. M. Reemer 2016 / Voucher code MR717"; label 3: "HOLOTYPE / Peradon brevis / M. Reemer".

Description

(based on holotype). Adult male. Body size: 7 mm.

Head. Face occupying 0.5 of head width in frontal view; black, except for pale yellow, oblique yellow maculae laterally on ventral half; golden yellow pilose, with narrow bare mid line. Gena black; white pilose. Lateral oral margin clearly produced; black; white pilosity. Frons and vertex black, golden pilose. Occiput black; golden pile dorsally, white pile ventrally. Eye bare. Antennal fossa approx. as wide as high. Antenna dark brown, basal half of scape pale brown. Ratio scape:basoflagellomere approximately 1:1.2. Basoflagellomere parallel-sided with rounded apex. Arista slender, ca. 3/5 of length of basoflagellomere.

Thorax. Mesoscutum dull blackish brown; golden yellow pilose, except for mediolateral patches of black pile. Postpronotum pale brown; bare. Postalar callus brown; golden yellow pilosity. Scutellum dark brown with faint metallic green hue, posterior margin paler; short golden yellow pilosity; with two apical calcars of ca. 1/6 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; golden pile anteriorly and posteriorly, with wide bare area in between. Anepimeron entirely whitish pilosity. Katepisternum white pilosity dorsally, bare ventrally. Other pleura bare (except for microtrichiae). Calypter whitish with yellow margin. Halter yellow.

Wing. Hyaline with yellow veins, except for dark veins in apical 1/3 of wing and around apical 1/2 of cell br, wing membrane also somewhat infuscate around apical 1/2 of br. Wing microtrichose, except bare on posterobasal 1/4 of br, posterobasal 1/3 of bm, anterobasal 1/6 of cup, and most of alula (only microtrichose along margins).

Legs. Brownish black, except ‘knees’ of mid leg (narrow part of apex of mid femur and base of mid tibia), hind tibia and basal three tarsomeres of hind leg yellowish brown; white pile on dark brown parts and yellow pile on yellowish brown parts.

Abdomen. Oval, widest at posterior margin of tergite 2, with tergite 3 approximately parallel-sided; blackish brown, except pale brown on posterior margin of tergite 4; tergite 1 white pilose; tergite 2 short black pilose except longer yellow pilosity along anterior and lateral margins, tergite 3 short black pilose except golden yellow pilose along lateral and posterior margins, tergite 4 entirely thick golden pile. Sternites dark brown; white pilose, except sternite 1 bare. Genitalia as in Fig. 280 .

Female. Unknown.

Diagnosis.

Body length: male 7 mm (female unknown). A small species with densely golden pilose tergite 4. Distinguished from similar species by: basoflagellomere longer than scape, mesonotum with anterior and median fascia of golden pile fused into a single wide fascia, which is connected to the posterior fascia by a wide median vitta ( Fig. 96 ). Postpronotum bare.

Distribution.

The species is only known from the type locality in Ecuador.

Etymology.

The specific epithet brevis (Latin) means short, which refers to the sturdy appearance of this species.

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 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 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 171 - 176. 171 - 173 Peradon bispina male, holotype: 171 habitus dorsal 172 habitus lateral 173 head frontal (the head belongs to a species of another microdontine genus, see text) 174 - 176 Peradon brevis male, holotype: 174 habitus dorsal 175 head frontal 176 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.