Amblypsilopus olgae, Grichanov, 2021

Grichanov, Igor Ya., 2021, Eleven new species of Amblypsilopus Bigot (Diptera: Dolichopodidae: Sciapodinae) and a key to the species of Madagascar and adjacent islands, European Journal of Taxonomy 755 (1), pp. 47-87 : 80-82

Amblypsilopus olgae sp. nov.

urn:lsid:zoobank.org:act:06A4A8A3-6A63-4EBF-BA25-4DA0E45A1AA9

Fig. 12

Diagnosis

Amblypsilopus olgae sp. nov. is very close to A. andasibensis sp. nov. in habitus. The latter differs from the new species in the fore tarsomere 4 entirely black, tarsomere 5 white. The fore tarsomeres 4–5 are entirely white in A. olgae sp. nov.; the long lobe of the cercus ends with one long and one short thick setae, but no long setae at middle.

Etymology

The species name is dedicated to Olga Grichanova, a member of my family (St. Petersburg, Russia).

Material examined

Holotype MADAGASCAR • ♂; Andasibe, Analamazaotra Forest ; 18°46ʹ S, 48°24ʹ E; 950 m a.s.l.; 31 Oct.–4 Nov. 2007; L. Friedman leg.; SMNHTAU.

Description

Male

MEASUREMENTS. Body length 5.7 mm; antenna length 1.2 mm; wing length 4.8 mm; wing width 1.2 mm.

HEAD ( Fig. 12A ). Frons black, white pollinose; strong short anterior vertical and long postvertical bristles; upper postocular setae black, short; lateral postocular setae white, uniserial; ventral postcranium covered with irregular white hairs; face densely silvery-white pollinose, narrow, 3.8 times as high as wide under antennae, 8.7 times as high as wide at clypeus, at clypeus nearly as wide as postpedicel; clypeus small, slightly bulging; antenna ( Fig. 12B ) with scape and pedicel dirty yellow, postpedicel orange on basal half and brown distally, 1.3 times as long as height of head; pedicel with short bristles, with one long dorsal bristle; postpedicel ovate, 1.1 times as long as high, with short hairs; arista-like stylus dorsal, microscopically haired; length (mm) of scape, pedicel, postpedicel, stylus, 0.08/0.07/0.1/0.99; proboscis orange; palpus blackish, with white and brown hairs.

THORAX. Mesonotum orange, with brown, shining greenish blue, medial stripe expanding posteriorly; scutellum metallic blue; pleura yellow, weakly pollinose; 6 strong dorsocentral bristles gradually decreasing in size anteriorly with strongest posterior pair; acrostichals short, biserial; scutellum with 2 strong bristles and 2 hairs laterally.

LEGS. Mostly yellow; coxae yellow; tarsi brown from tip of basitarsus; segments 4 and 5 of fore tarsus white ( Fig. 12C ); fore and mid coxae with light and dark hairs and 2–3 black subapical setae; hind coxa with 1 black seta at middle; femora without strong or long setae; fore tibia without conspicuous setae; fore basitarsus thin and long, with 6 short ventral setae, two times as long as width of segment; segments 4–5 flattened dorsoventrally, slightly widened, with black flattened setae laterally, longer than tarsomere width; mid tibia with one short anterodorsal and two short posterodorsals, without conspicuous ventral setae; mid and hind tarsi simple, cylindrical; hind tibia with several short dorsal and ventral setae; femur, tibia and tarsomere (from first to fifth) length ratio (mm): fore leg: 1.33/1.69/3.83/0.7/0.54/0.22/0.13, mid leg: 1.55/3.12/2.19/0.63/0.39/0.21/0.13, hind leg: 2.37/3.77/1.46/0.75/0.4/0.23/0.13.

WING ( Fig. 12D ). Widened distally, almost hyaline, veins brown; R 4+5 gently curved to M 1 in apical third; M 1+2 straight in basal half, slightly convex anteriad in middle part; M 1 with strong elbow, forming right angle with M 1+2; ratio of parts of costa between R 2+3 and R 4+5 to those between R 4+5 and M 1, 4.5/1; crossvein dm-m straight; ratio of crossvein dm-m to apical part of M 1+2 (fork-handle) to apical part of M 4, 0.47.1.07/0.44; anal vein and lobe reduced; anal angle absent; lower calypter brownish, with fine brown cilia; halter yellow with brown knob.

ABDOMEN. Thin and long, mostly orange-yellow, brown along distal margin of tergite 2 and along dorsal side of tergites 3–6, with short black hairs and marginal setae; pregenital segments combined three times as long as mesonotum; hypopygium ( Fig. 12E ) brown, with brown to black appendages; hypandrium short, with reduced arms; cercus ( Fig. 12F ) brown, bifurcated from base; dorsal lobe partly concealed, flat, subtriangular, half as long as epandrium, with pointed apex, sparsely covered with long dark setae along entire length, densely covered with numerous setulae at base; ventral arms of cerci fused at base, as long as epandrium; ventral arm of each cercus directed ventrally, bifurcated from point of fusion, with long thin distal lobe ending with one long and one short thick setae; proximal lobe of ventral arm thick, with ventral series of setae on distal half, beginning with very long thick curved seta at middle, then about 5 short thick setae, ending with 3–4 very long simple setae; surstylus projected, bilobed, with irregularly curved broad flat arms; dorsal arm of surstylus with small process at apex; ventral arm of surstylus larger and stronger sclerotized than dorsal arm, with small spine at base, with pointed subapical projection and 3 big and thick apical setae; epandrial lobe simple, projected, sclerotized; 2 long epandrial setae at base of epandrial lobe.

Female

Unknown.

Figures

Fig. 12. Amblypsilopus olgae sp. nov. Holotype, ♂ (SMNHTAU). A. Head. B. Antenna. C. Fore tarsomeres 2–5. D. Wing. E. Hypopygium, left lateral view, reflected light. F. Distal appendages of hypopygium, transmitted light.