Eumerus atricolorus 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: 111-115
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|Eumerus atricolorus Gilasian & van Steenis|
Eumerus atricolorus Gilasian & van Steenis , sp. nov.
Antenna brownish-black; eyes coalescent at one point; ocellar triangle almost equilateral; occiput narrow, less bulging; scutum without pollinose vittae, with short whitish pile; legs predominantly black; mesotrochanter slightly pollinose with pile ventrally; abdomen mostly reddish-brown. This species is closely related to E. mesasiaticus and E. richteri except for the following characters: basoflagellomere brownish-black (orange in E. mesasiaticus and E. richteri ); scutum shiny black without pollinose vittae (with median longitudinal pollinose vittae in E. mesasiaticus ); legs predominantly black except for brownish-orange apex of femora, basal orange narrow margin of tibiae and orange tarsomeres ventrally (basal ⅓–½ of tibiae in E. mesasiaticus and basal ¼–⅓ of tibiae in E. richteri orange; tarsi in E. mesasiaticus and E. richteri mostly orange).
The specific epithet ‘ atricolorus ’ [Latin] is derived from ‘atricoloris’ (black coloured), in reference to the deep black coloured thorax and legs.
IRAN • ♂; “ IRAN: Kerman prov., Baft / Deh Sard , 2280 m. / 28°45′0.2″N, 056°31′21.7″E, / 22.iv.2006, / leg. Gilasian // HOLOTYPUS ♂ / Eumerus atricolorus / Gilasian & van Steenis / 2020 [red label]”; HMIM.GoogleMaps
MEASUREMENTS. Body length: 9.7 mm; wing length: 7.2 mm.
HEAD ( Fig. 13 View Fig A–B). Eyes short pilose, coalescent at one point; face nearly parallel-sided, mostly shiny black, weakly grey pollinose at lateral margin and covered with long whitish pile; frontal triangle predominantly shiny black, weakly grey pollinose laterally and with dense whitish pile; head in frontal view about 3.3 times as wide as face; frontal triangle about 1.4 times as long as vertical triangle; vertical triangle mostly shiny black, weakly pollinose laterally and with whitish pile; ocellar triangle almost equilateral; ocellar triangle weakly pollinose, with whitish pile, and nearly as long as vertical triangle; distance between posterior ocelli to posterior margin of eye about 0.65 times as long as ocellar triangle; occiput grey pollinose, with light pile; frontal triangle 1.4 times as wide as ocellar triangle; vertex at posterior corner of eyes 1.35 times as wide as vertex over posterior ocelli; head in dorsal view 4.7 times as wide as vertex at posterior corner of eyes; antenna including arista entirely brownishblack; basoflagellomere rounded apicoventrally, 1.3 times as long as wide; arista 1.5 times as long as basoflagellomere ( Fig. 11A View Fig ).
THORAX. Scutum and scutellum shiny black with short whitish pile; scutum without pollinose vittae; scutellum with marginal rim; pleurae shiny black, covered with short whitish pile except for bare meron and katepimeron; metasternum pilose.
LEGS ( Fig. 9A View Fig ). Legs predominantly shiny black except for brownish-orange apex of femora, basal narrow orange margin of tibiae and orange tarsomeres ventrally; short whitish pilose; mesotrochanter weakly pollinose and with pile ventrally; metatarsus with a short tuft of orange pile ventrally; metafemur simple, slightly enlarged, about 3.75 times as long as wide, ventral pile very short and about 1/6–1/7 of width of metafemur; anteroventral and posteroventral margins of metafemur each with a row of 10 respectively 7 black setae apically.
WING. Hyaline; entirely microtrichose; calypters yellowish-white; halter brownish-orange.
ABDOMEN. Predominantly reddish-brown; tergum I black with whitish pile laterally; terga II–IV reddishbrown, white pilose, each with a pair of oblique maculae of white pollinosity; tergum II with a median black ‛pewter chalice’-shaped vitta; tergum III with a median longitudinal black vitta on anterior half; sterna reddish-brown, yellowish pilose; sternum IV almost square, with median V-shaped incision posteriorly ( Fig. 12A View Fig ).
GENITALIA ( Figs 18A View Fig , 20A View Fig , 22A View Fig ). Hypandrium simple; aedeagal apodeme narrow in lateral view; cercus semi-rectangular, convex dorsally; posterior lobe of surstylus (lateral view) uniformly rounded apically, with 4–5 rows of short median setulae; posterior lobe of surstylus (dorsal view) sinuous-shaped on outer side; inner accessory lobe of surstylus with short pile.
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