Eumerus ovoformus 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: 128-130
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|Eumerus ovoformus Gilasian & van Steenis|
Eumerus ovoformus Gilasian & van Steenis , sp. nov.
Basoflagellomere brownish-orange and egg-shaped; eyes long pilose, not coalescent; abdomen mostly red except for median black vitta on abdominal tergum II and median small black macula on anterior margin of tergum III. This species is closely related to E. coeruleus except for the following characters: eyes 8–9 ommatidia spaced (separated in E. coeruleus by about 4 ommatidia); ocellar triangle isosceles (equilateral in E. coeruleus ); ocellar triangle 1.2 (0.6 in E. coeruleus ) times as long as vertical triangle; distance between posterior ocelli to posterior margin of eye about 0.9 (1.2 in E. coeruleus ) times as long as ocellar triangle; vertex wider than in E. coeruleus ; head in dorsal view 3.5 times as wide as vertex at posterior corner of eyes (about 5.5 times in E. coeruleus ); vein R 4+5 slightly sinuate (deeply sinuate in E. coeruleus ); legs predominantly black except for orange apex of femora and orange basal third of tibiae (orange basal half of tibiae and almost entirely orange tarsi in E. coeruleus ); metafemur more enlarged than in E. coeruleus ; abdominal tergum III almost entirely orange (with distinct median black vitta in E. coeruleus ); posterior lobe of surstylus (dorsal view) truncated apically on outer side (uniformly rounded in E. coeruleus ); posterior lobe of surstylus (dorsal view) with a distinct process on inner side (without process in E. coeruleus ).
The specific epithet ‘ ovoformus ’[Latin] is derived from ‘ovum’(egg) and ‘forma’ (shape), in reference to the egg-shaped basoflagellomere which is very characteristic for this species within the genus Eumerus .
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. / Parchami- Araghi // HOLOTYPUS ♂ / Eumerus ovoformus / Gilasian & van Steenis / 2020 [red label]”; HMIM. GoogleMaps
MEASUREMENTS. Body length: 7.5 mm; wing length: 6.2 mm.
HEAD ( Fig. 16 View Fig E–F). Eyes long pilose, dichoptic, 8–9 ommatidia spaced; face nearly parallel-sided, weakly grey pollinose and covered with long whitish pile; frontal triangle predominantly shiny black, weakly grey pollinose at lateral margin and with whitish pile; head in frontal view about 3.5 times as wide as face; frontal triangle about 1.3 times as long as vertical triangle; vertical triangle shiny black, with whitish pile; ocellar triangle isosceles; ocellar triangle shiny black, with whitish pile, almost 1.15 times as long as wide and about 1.2 times as long as vertical triangle; distance between posterior ocelli to posterior margin of eye about 0.9 times as long as ocellar triangle; occiput grey pollinose, with light pile; frontal triangle nearly 1.5 times as wide as ocellar triangle; vertex at posterior corner of eyes 1.6 times as wide as vertex over posterior ocelli; head in dorsal view 3.5 times as wide as vertex at posterior corner of eyes; scape and pedicel dark brown; basoflagellomere brownish-orange, egg-shaped, 1.7 times as long as wide; arista brown, 1.1 times as long as basoflagellomere ( Fig. 11G View Fig ).
THORAX. Scutum and scutellum shiny black with long yellowish-white pile; scutellum with marginal rim; pleurae shiny black, covered with long yellowish pile except for bare meron and katepimeron; metasternum pilose.
LEGS ( Fig. 9F View Fig ). Predominantly shiny black except for orange apex of femora and orange basal third of tibiae; proleg predominantly with white pile except for a little black pile on basal half of profemur ventrally; mesoleg mostly with white pile except for black pilosity on mesofemur anteriorly; metaleg mostly with long whitish pile with exception of a little black pile on metafemur apicoventrally, short black pile on metatibia ventrally and a short tuft of orange pile on metatarsus ventrally; metafemur simple, enlarged, about 3.2 times as long as wide, ventral pile about ⅓ of width of metafemur; anteroventral and posteroventral margins of metafemur each with a row of 7 respectively 3 black setae apically.
WING. Hyaline; entirely microtrichose; vein R 4+5 slightly sinuate; calypters whitish; halter yellowish-white.
ABDOMEN. Tergum I black with whitish pile laterally; terga II–IV each with a pair of lunulate-shaped oblique maculae of white pollinosity; tergum II orange with a median black ‛pewter chalice’-shaped vitta; tergum II mostly white pilose except for black pilosity on about posterior third, anterolateral pile on tergum II long; terga III–IV predominantly orange, tergum III with a median small black macula on anterior margin; pile on tergum III short and black dorsally, white and long laterally; tergum IV pilosity mostly white, except for short black pile anteriorly; sterna yellowish pilose; sternum I black; sterna II– IV orange; sternum IV rectangular, with median V-shaped incision posteriorly.
GENITALIA ( Figs 18E View Fig , 20E View Fig , 22E View Fig ). Hypandrium simple; aedeagal apodeme as in Fig. 22E View Fig in lateral view; cercus semi-rectangular; posterior lobe of surstylus (lateral view) wide, with only long median setae, without a row of short setulae posteriorly; posterior lobe of surstylus (dorsal view) narrowed toward apex, truncated apically on outer side and with a distinct process on inner side; inner accessory lobe of surstylus with short pile.
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