Peradon costaricensis 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 costaricensis Reemer sp. nov. Figs 3 , 51 , 62 , 64 , 117 , 118 , 180-185 , 268

Type material.

Holotype. Costa Rica • 1 ♂, holotype of Peradon costaricensis sp. nov.; Braulio Carillo National Park; 10°10'N, 84°07'W; 500 m a.s.l.; 10 Apr. 1985; H. Goulet-L. Masner leg.; CNC.

Label 1: "COSTA RICA / B. Carrillo N.P. / 10°10'N, 84°07'W / 10.IV.85; 500 m. / H. Goulet-L. Masner".

Paratypes. Costa Rica • 1 ♂ 1 ♀; National Park Braulio Carillo, Quebrada Gonzales, 30 km NNE San José; 10°09'N, 83°55'W; 7 Apr. 2004; J.-H. Stuke leg.; ZFMK.

Description

(based on holotype). Adult male. Body size: 13.5 mm.

Head. Face occupying 0.44 of head width in frontal view; yellow; pale golden yellow pile. Gena black; white pilosity. Lateral oral margin weakly produced; black; white pilosity. Frons and vertex black; pale golden yellow pilosity, except black pilosity at ocellar triangle. Occiput black; pale golden yellow pile dorsally, white pilose ventrally. Eye bare. Antennal fossa approx. as wide as high. Antenna brown. Ratio scape:basoflagellomere approximately 1:1.6. Basoflagellomere parallel-sided with rounded apex. Arista slender, ca. 3/4 of length of basoflagellomere.

Thorax. Mesoscutum dull black; short black pilosity, except for narrow uninterrupted fasciae of golden yellow pile along anterior and posterior margins and transverse suture. Postpronotum brown; golden yellow pile. Postalar callus blackish brown; golden yellow pilosity. Scutellum blackish brown with faint metallic shine, posterior margin yellow; white pilosity; with two apical calcars of ca. 1/4 of length of scutellum, with mutual distance approximately equal to length of scutellum. Pleura brown. Anterior and posterior part of anepisternum separated by deep sulcus; golden yellow pile anteriorly and posteriorly, with wide bare area in between. Anepimeron entirely pale golden yellow pile. Katepisternum white pilose dorsally, bare ventrally. Other pleura bare (except for microtrichiae). Calypter pale yellowish grey, halter yellow.

Wing. Hyaline, slightly brownish in anterior cells; veins around cell br and vena spuria yellow. Wing microtrichose, except bare on posterobasal 1/2 of cell br, basal 3/4 of cell bm (but with for narrow median strip of microtrichiae over entire length of cell), and most of alula (only microtrichose along margins).

Legs. Pale brown; yellow pilosity, except coxae silvery white pilose.

Abdomen. Elongate, widest at posterior 1/2 of tergite 2, tergite 3 slightly tapering distally. Tergites dark brown, except tergite 2 yellowish brown along lateral margins. Tergite 2 with relatively long golden pilosity, except for long white pile anterolaterally. Tergite 3 with very short dark golden yellow pile, except for longer appressed silvery white pile along lateral margins. Tergite 4 with very short blackish pilosity, although under certain angles the pile may seem to have a golden sheen. Sternites brown; yellow pile, except sternite 1 bare. Genitalia as in Fig. 268 .

Female. As male, except for the following differences: body length 14 mm. Face dark brown. Fascia of golden pile along transverse suture narrowly interrupted medially. Wing yellow on anterior half. Tergite 3 short black pile, except for longer whitish pile laterally. Tergite 5 short black pile.

Diagnosis.

Body length: male 12.5-13.5 mm, female 14 mm. Pale specimens are readily recognizable by the colour pattern of the abdomen: entirely dark brown except for yellowish lateral margins of tergite 2 ( Fig. 67 ). Dark specimens differ from the black morph of P. bidens by the partly bare wing cell bm, and the uninterrupted fascia of golden pile along the transverse suture (widely interrupted in P. bidens ). Dark specimens also resemble P. sciarus but differ by the presence of a fascia of golden pile along the transverse suture (absent in P. sciarus ).

Notes.

The male paratype is considerably darker in colouration than the holotype and the female paratype. All wing veins are dark and the lateral margins of tergite 2 are only slightly paler than the rest of this tergite. In other characters, however, the specimens are more or less identical.

Distribution.

The species is only known from Costa Rica.

Etymology.

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

Figures

Figures 3 - 7. 3 Head of Peradon costaricensis sp. nov. in lateral view. Note ventrally produced gena and oral margin 4 Face of Peradon bidens in frontal view. Note transversely wrinkled median vitta, a character found in most Peradon species 5 Wing of Peradon bidens. Note posterior appendix of vein R 4 + 5 and widely rounded postero-apical corner of cell r 4 + 5 6 Anepisternum of Peradon bidens. Note extensively bare median area 7 Thoracic sclerites of Peradon bidens in lateral view. Note flat and bare katepimeron with wrinkled texture (the wrinkles extend from similar wrinkles om the katatergum). Abbreviations: Anepm = anepimeron; anatg = anatergum; ktg = katatergum; kepm = katepimeron.

Figures 48 - 52. 48 Peradon satyricus, head profile 49, 50 Hind legs of Peradon: 49 P. satyricus 50 P. bidens 51, 52 Head in frontal view: 51 P. costaricensis 52 P. sciarus.

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 112 - 118. Dorsal habitus of Peradon species (bidens group) 112 P. satyricus ♂ holotype 113 P. sciarus ♂ holotype 114 P. bidens typical variation ♀ (holotype M. flavomarginatum Curran) 115 P. bidens typical morph ♂ Suriname RMNH 116 P. bidens morph langi ♂ Suriname RMNH 117 P. costaricensis ♂ paratype 118 P. costaricensis ♀ paratype. Scale bar: 10 mm.

Figures 180 - 185. 180 - 184 Peradon costaricensis male, holotype: 180 habitus dorsal 181 habitus lateral 182 head frontal 183 head lateral 184 wing 185 Peradon costaricensis female, paratype: face 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.

Figures 67 - 73. 37 - 39 Abdomen in dorsal view 67 P. costaricensis male (holotype) 68 P. aurifascia male (Brazil CSCS) 69 P. luridescens male (Suriname RMNH) 70 Face of P. aurifascia male (holotype). Note smooth and bare median vitta 71 Tergite 4 of P. aurifascia in lateral view. Note reddish apical margin 72, 73 Scutellum: 72 P. angustiventris female (Brazil INPA) 73 P. angustus male (neotype).