Eumerus vallicolus 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 vallicolus

description: Eumerus vallicolus Gilasian & van Steenis sp. nov.
urn:lsid:zoobank.org:act: DB618219-7086-4DFA-82AC-F261D536B68D
Figs 4H, 7H, 10D, 11I, 12F, 17 G–H, 19D, 21D, 23D
Diagnosis
This species differs from the species E. tricolor, E. pamirorum, E. sarybulunis and E. coeruleithorax by the following characters: eyes distinctly dichoptic, 5–6 ommatidia spaced, distance between eyes wider than in E. tricolor but narrower than in E. pamirorum and E. coeruleithorax, eyes in E. sarybulunis coalescent over some distance; frontal triangle with dense whitish pile like in E. sarybulunis (it is not covered with so dense pile in E. tricolor, frontal triangle in E. coeruleithorax with sparse black pile and in E. pamirorum with sparse white pile); ocellar triangle narrow like in E. tricolor (it is wider in other species); ocellar triangle black pilose like in the European E. tricolor (with white pile in Turkish E. tricolor and other species); thorax with relatively long pile like in E. coeruleithorax (with very short pile in E. tricolor and covered with longer pile in E. sarybulunis and E. pamirorum); metafemur narrow like in E. tricolor (in other species it is either longer pilose and/or incrassate); abdominal maculae on terga III and IV more oblique than in other species.
Etymology
The name ‘vallicolus’ [Latin] is derived from ‘vallis’ (valley) and ‘incola’ (dweller), in reference to Chekab Valley, where the holotype was collected.
Material examined
Holotype
IRAN • ♂; “ IRAN: Markazi prov., Haftad / Qolleh Protected Area, / Chekab Valley, 2219 m, / 34°07′0.5″N, 050°16′25.3″E, / 28.v–15.vi.2016, Malaise trap / near pool, E. Gilasian & M. / ParchamiAraghi // HOLOTYPUS ♂ / Eumerus vallicolus / Gilasian & van Steenis / 2020 [red label]”; HMIM.
Description
Male (Figs 4H, 7H)
MEASUREMENTS. Body length: 6 mm; wing length: 4.5 mm.
HEAD (Fig. 17 G–H). Eyes short yellowish pilose, dichoptic, 5–6 ommatidia spaced; face nearly parallelsided, shiny black and covered with short yellowish-white pile; frontal triangle black, weakly pollinose and covered with dense whitish pile; head in frontal view 4.3 times as wide as face; frontal triangle 1.6 times as long as vertical triangle; vertical triangle shiny black, with brownish pile; ocellar triangle isosceles; ocellar triangle shiny black, with blackish pile, 1.1 times as long as wide and 1.4 times as long as vertical triangle; distance between posterior ocelli to posterior margin of eye about 0.6 times as long as ocellar triangle; occiput light grey pollinose, with yellowish pile; frontal triangle 1.25 times as wide as ocellar triangle; vertex at posterior corner of eyes 1.2 times as wide as vertex over posterior ocelli; head in dorsal view 5.3 times as wide as vertex at posterior corner of eyes; antennae brownish-black; basoflagellomere almost 0.9 times as long as wide; arista about 2 times as long as basoflagellomere (Fig. 11I).
THORAX. Scutum and scutellum shiny black, with relatively long white pile, without median pollinose vittae; posterolateral part of scutum with a longitudinal row of black seulae above base of wing; scutellum with marginal rim; pleurae shiny black; anepisternum, anepiemron and katepisternum with short whitish pile.
LEGS (Fig. 10D). Predominantly black, short yellowish-brown pilose; apex of femora and basal narrow margin of tibiae orange; metafemur simple, narrow, about 4 times as long as wide; anteroventral and posteroventral margins of metafemur each with a row of 11 respectively 6 black setae in about apical half; metatarsus with tuft of dense orange pile ventrally.
WING. Hyaline, entirely microtrichose; vein R 4+5 slightly sinuate; calypters yellowish; halter yellowishorange.
ABDOMEN. Tergum I black with short blackish pile; tergum II mostly orange except for anterior black margin and median black vitta not reaching posterior margin of segment; tergum II yellowish pile except for short blackish pilosity on its posterior third; tergum III entirely orange, mostly short blackish pile except for whitish pile on its white maculae; tergum IV black, with mostly short whitish pile except for short black pile on its anterior and posterior margin; sterna short yellowish pilose; sternum I black in anterior half and orange in posterior half; sterna II and III orange; sternum IV black, rectangular, with rounded posterolateral corners and with median wide V-shaped incision posteriorly (Fig. 12F).
GENITALIA (Figs 19D, 21D, 23D). Hypandrium simple; aedeagal apodeme relatively narrow in lateral view; posterior lobe of surstylus in lateral view sharply extending outward posteroventrally, with a longitudinal row of short and black setulae posteriorly, with a few short median setulae and with 2–3 setae anteriorly, posterior lobe of surstylus in dorsal view uniformly rounded apically, almost balloonshaped, covered with short setulae; inner accessory lobe of surstylus with short pile.
Female
Unknown.
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 145-146, DOI: 10.5852/ejt.2020.722.1139, http://zenodo.org/record/4239287