Eumerus brevipilosus Gilasian & van Steenis
Gilasian, Ebrahim, Steenis, Jeroen van & Parchami-Araghi, Mehrdad, 2020, Review of the Eumerus tricolor species group (Diptera: Syrphidae) in Iran, with description of six new species, European Journal of Taxonomy 722, pp. 106-152: 115-117
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|Eumerus brevipilosus Gilasian & van Steenis|
This species is closely related to E. aurofinis except for the following characters: body length about 8 mm, not densely punctuated (with coarse and dense punctuation in E. aurofinis ); wing hyaline (infuscated in E. aurofinis in the area posterior to intersection of veins R2+3 and R4+5); metafemur slightly enlarged (strongly enlarged in E. aurofinis ); aedeagal apodeme long, narrow and abruptly bent apically (short, wide and without bend in E. aurofinis ) (see Grković et al. 2015: 367, fig. 4C); posterior lobe of surstylus in lateral view wider than in E. aurofinis (see Grković et al. 2015: 367, fig. 4A).
The specific epithet ‘ brevipilosus ’ [Latin] is derived from ‘brevis’ (short) and ‘pilosus’ (pilose), in reference to the very sparse and short pile on the head, thorax and abdomen rarely seen in the genus Eumerus .
IRAN • ♂; “ IRAN: Fars prov., Meimand / Firouzabad, Kuhe - Sefidan / 28°56′0.34″N, 052°48′58.0″E / 2080m., 9.iv.2006 / E. Gilasian // HOLOTYPUS ♂ / Eumerus brevipilosus / Gilasian & van Steenis / 2020 [red label]”; HMIM.GoogleMaps
IRAN • 4 ♀♀; same collection data as for holotype; HMIM GoogleMaps .
MEASUREMENTS. Body length: 7.8 mm; wing length: 5.5 mm.
HEAD ( Fig. 13 View Fig C–D). Eyes short and white pilose, dichoptic, 2–3 ommatidia spaced; face nearly parallelsided, weakly grey pollinose, with whitish pile; frontal triangle weakly grey pollinose, entirely covered with dense and long white pile; head in frontal view 3.2 times as wide as face; frontal triangle almost 1.3 times as long as vertical triangle; vertical triangle almost entirely shiny black, with yellowish pile; ocellar triangle nearly equilateral; ocellar triangle bulging and shiny black, with black pile, about as long as vertical triangle; distance between posterior ocelli to posterior margin of eye nearly 0.8 times as long as ocellar triangle; occiput light grey pollinose, with light pile; frontal triangle nearly 1.6 times as wide as ocellar triangle; vertex at posterior corner of eyes 1.15 times as wide as vertex over posterior ocelli; head in dorsal view 4.5 times as wide as vertex at posterior corner of eyes; scape brown; pedicel yellowish brown; basoflagellomere orange, 1.2 times as long as wide; arista brown, 1.3 times as long as basoflagellomere ( Fig. 11B View Fig ).
THORAX. Scutum and scutellum shiny black with very short yellowish pile; scutum with two narrow median pollinose vittae reaching to median suture; anterior part of median vittae semi-triangular; posterolateral part of scutum with a longitudinal row of black setulae above base of wing; scutellum with marginal rim; pleurae shiny black; anepisternum, katepisternum and anepimeron covered with short yellowish pile.
LEGS ( Fig. 9B View Fig ). Legs shiny black, with yellowish short pile; procoxa orange apically; femora predominantly black except for orange apical tip and basal narrow orange margin, basal half and apex of tibiae orange; tarsi mostly orange except for brownish-black dorsally; metafemur simple, slightly enlarged, about 3 times as long as wide, with very short yellowish pile ventrally; anteroventral and posteroventral margins of metafemur each with a row of 8 respectively 5 black setae in about apical half.
WING. Entirely microtrichose; vein R 4+5 nearly straight; calypters whitish; halter yellowish-orange.
ABDOMEN. Black, covered with very short yellowish pile except for long whitish pile on tergum II anterolaterally; terga II–IV each with a pair of lunulate-shaped oblique maculae of white pollinosity; sterna brown, with yellowish short pile; sternum IV rectangular, with rounded posterolateral corners and with median wide V-shaped incision posteriorly ( Fig. 12B View Fig ).
GENITALIA ( Figs 18B View Fig , 20B View Fig , 22B View Fig ). Hypandrium simple; aedeagal apodeme in lateral view narrow and abruptly bent apically; cercus semi-rectangular; posterior lobe of surstylus in lateral view thumb-shaped apically and in dorsal view uniformly rounded apically and entirely covered with short setulae dorsally; inner accessory lobe of surstylus with short pile.
Body length: 7.8–8.2 mm; wing length: 6.0– 6.5 mm. Same as male except for sexual dimorphism and for the following characters: frons shiny black, weakly pollinose laterally and with short yellowish pile; vertex at posterior corner of eyes as wide as vertex over posterior ocelli; head in dorsal view 4 times as wide as vertex at posterior corner of eyes; scutum with median narrow pollinose vittae reaching to ⅓ behind median suture; anepisternum, katepisternum and anepimeron covered with very short yellowish pile.
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