Eumerus brevipilosus Gilasian & van Steenis 2020, sp. nov.
Creators: name: Gilasian, Ebrahim
name: Steenis, Jeroen van
name: Parchami-Araghi, Mehrdad
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Eumerus
Eumerus brevipilosus

description: Eumerus brevipilosus Gilasian & van Steenis sp. nov.
urn:lsid:zoobank.org:act: D239E0A4-F597-444E-8034-B5B1C67A55A0
Figs 3B, 5A, 6B, 8A, 9 B–C, 11B–C, 12B, 13C–D, 14A–B, 18B, 20B, 22B
Diagnosis
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 R 2+3 and R 4+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).
Etymology
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.
Material examined
Holotype
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.
Paratypes
IRAN • 4 ♀♀; same collection data as for holotype; HMIM.
Description
Male (Figs 3B, 6B)
MEASUREMENTS. Body length: 7.8 mm; wing length: 5.5 mm.
HEAD (Fig. 13 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).
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). 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).
GENITALIA (Figs 18B, 20B, 22B). 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.
Female (Figs 5A, 8A, 9C, 11C, 14 A–B)
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.
Distribution
Iran.
description: Published as part of 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, pp. 106-152 in European Journal of Taxonomy 722 on pages 115-117, DOI: 10.5852/ejt.2020.722.1139, http://zenodo.org/record/4239287