Eumerus chekabicus 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 chekabicus

description: Eumerus chekabicus Gilasian & van Steenis sp. nov.
urn:lsid:zoobank.org:act: 3BCD6EB2-919A-4ECD-81BE-CCC18A3D5493
Figs 3D, 6D, 9D, 11D, 12C, 13 G–H, 18C, 20C, 22C
Diagnosis
This species differs from E. grandis Meigen, 1822, E. ovatus Loew, 1848 and E. sinuatus Loew, 1855 by the following characters: eyes with long brownish pile (with long light brown pile in E. sinuatus and E. ovatus and short white pile in E. grandis); vertical triangle flat like in E. sinuatus and E. ovatus (bulging vertical triangle in E. grandis); eyes holoptic, eye contiguity long like in E. grandis and E. ovatus (dichoptic eyes in E. sinuatus); ocellar triangle isosceles in E. chekabicus sp. nov., E. grandis and E. ovatus, posteriorly rather broad in E. chekabicus sp. nov. (rather narrow in E. grandis and broad in E. ovatus), ocellar triangle in E. sinuatus equilateral; vertical triangle with mix of black pile posteriorly and yellow pile anteriorly like in E. grandis (entirely black pilose in E. ovatus and E. sinuatus); scutum shiny metallic, without median vittae like in E. ovatus (shiny bluish in E. sinuatus and shiny black with long median vittae in E. grandis); scutum with long brownish pile (with short brownish and black pile in E. grandis, long white pile in E. ovatus and long brownish and black pile in E. sinuatus); tergum IV entirely reddish-orange (mostly black in E. grandis except for narrow red portions anterolaterally; it is black with median dense white pile in E. ovatus and it is black medially, red anterolaterally and posteriorly in E. sinuatus); metafemur slightly enlarged, with long whitish pile anteriorly (enlarged with long pile posteriorly in E. grandis, slightly enlarged with rather long pile anteriorly in E. ovatus and narrow with long pile anteriorly in E. sinuatus); metatibia long whitish pilose (with short whitish pilosity in E. sinuatus and short brown to black pilosity in E. grandis and E. ovatus).
Etymology
The name ‘ chekabicus ’ [Latin, adjective] refers to the Chekab Valley in the Haftad Qolleh Protected Area, Markazi province, 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, / 25.v–15.vi.2016, Malaise trap / near pool, E. Gilasian & M. / ParchamiAraghi // HOLOTYPUS ♂ / Eumerus chekabicus / Gilasian & van Steenis / 2020 [red label]”; HMIM.
Description
Male (Figs 3D, 6D)
MEASUREMENTS. Body length: 10.5 mm; wing length: 7 mm.
HEAD (Fig. 13 G–H). Eyes long brownish pilose, holoptic, eyes contiguity almost 0.6 times as long as frontal triangle; face nearly parallel-sided, shiny black and covered with dense and long yellowish pile; frontal triangle shiny black, entirely covered with dense yellowish pile; head in frontal view 3.75 times as wide as face; frontal triangle 1.3 times as long as vertical triangle; vertical triangle shiny black, with yellowish pile; ocellar triangle isosceles; ocellar triangle shiny black, with mix of yellowish and black pile, 1.25 times as long as wide and nearly as long as vertical triangle; distance between posterior ocelli to posterior margin of eye about 0.7 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 1.3 times as wide as vertex over posterior ocelli; head in dorsal view 5.5 times as wide as vertex at posterior corner of eyes; antennae brownish-black; basoflagellomere almost as long as wide; arista about 2.2 times as long as basoflagellomere (Fig. 11D).
THORAX. Scutum and scutellum shiny metallic, weakly pollinose, with long and dense yellowish pile, without median pollinose vittae; posterolateral part of scutum with two black setulae above base of wing; scutellum with marginal rim; pleurae black; anepisternum, anepiemron and katepisternum with long yellowish pile.
LEGS (Fig. 9D). Legs black; metatrochanter orange at apex; metacoxa with long yellowish-white pile; pro- and mesofemora with long whitish pile posteriorly; mesofemur with short blackish pile anteriorly; metafemur simple, slightly enlarged, about 4 times as long as wide, with long whitish pile anteriorly; anteroventral and posteroventral margins of metafemur each with a row of 9 respectively 6 black setae in about apical half; pro- and mesotibiae with very short dense whitish pile dorsally and with long whitish pile posteriorly; metatibia with dense long whitish pile dorsally; metatarsus with short black pile dorsally and with tuft of dense orange pile ventrally; metasternum with long whitish pile.
WING. Sparsely microtrichose in basal half; vein R 4+5 slightly sinuate; calypters yellowish-white; halter brownish-orange.
ABDOMEN. Tergum I black with whitish pile; terga II–IV long whitish pilose, each with a pair of lunulashaped oblique maculae of white pollinosity; tergum II reddish-orange with a median black ‘pewter chalice’-shaped vitta; tergum III mostly reddish-orange except median narrow black vitta; tergum IV entirely reddish-orange; sterna orange, long yellowish pilose; sternum IV rectangular, with rounded posterolateral corners and with median wide V-shaped incision posteriorly (Fig. 12C).
GENITALIA (Figs 18C, 20C, 22C). Hypandrium simple; aedeagal apodeme wide in lateral view; posterior lobe of surstylus in lateral view narrowed toward apex, with a row of short and black setulae posteriorly and in dorsal view uniformly rounded apically with a strong median bend; 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 117-118, DOI: 10.5852/ejt.2020.722.1139, http://zenodo.org/record/4239287