Atelestus ibericus Bartak, 2020

Kanavalova, Liliana, Kubik, Stepan & Bartak, Miroslav, 2020, Two new West Palaearctic species of Atelestus Walker (Diptera, Atelestidae) and new distributional records of the family, ZooKeys 955, pp. 147-158 : 147

Atelestus ibericus Bartak sp. nov. Figs 3 , 4

Type material.

Holotype ♂, Spain, Embalse de Barbate, SW [= sweeping], pasture nr. river, 37 m, 36°25'51"N, 5°44'38"E, Barták, Kubík, 6.-8.v.2017 (CULSP). Paratypes: 3 ♂, Embalse de Barbate, SW, meadow + cork oak, 55 m, 36°24'10"N, 5°44'16"E, Barták, Kubík, 5.-9.v.2017; 1 ♂, 8 km NE from Alcalá de los Gazules, SW, oak forest, 335 m, 36°30'50"N, 5°39'50"E, Barták, Kubík, 7.-8.v.2017 - (CULSP).

Diagnosis.

Small brownish black species of Atelestus with most setae black but abdomen partly pale setose. Male with long anterior part of gonocoxal apodeme, postgonites not serrate, and hypandrium short triangle-shaped, without posterior lobes. Female remains unknow.

Etymology.

The species is named after the region of origin (Iberian Peninsula).

Description.

Male head black, holoptic, entirely rather dark grey microtrichose, black setose. Eye large, ventral third with smaller facets sharply divided with horizontal line from dorsal part with larger facets. Occiput in dorsal part with row of medium long inclinate postocular setae (setae about as long as postpedicel), in lower part more densely medium moderately long setose, setae mostly black. Frons (very small triangle just above antennae) without setae. Face including clypeus and gena microtrichose, without setae, postgena with several longer pale setae (about as long as ocellars). Ocellar setae medium moderately long (about 0.20 mm), black, ocellar triangle with one pair of additional small posterior setae. Palpus brown, slightly clavate, with several short setulae; labrum very short (about 0.10 mm), postmentum microtrichose, with several setae, labellum broad, covered with black setulae. Antenna black, pedicel with circlet of short setulae (up to 0.09 mm); postpedicel broadly pear-shaped; length of antennal segments (scape: pedicel: postpedicel: 1st segment of stylus: stylus, in 0.01 mm scale) = 3-4: 5-6: 8-9: 1-2: 25-29. Thorax brownish black, sparsely grey microtrichose, without stripes, mostly black setose. Chaetotaxy: antepronotum with 1 rather long pale lateral seta and row of 6-10 short pale setulae, propleura with 1 seta, proepisternum with 0-1 setae, prosternum without setae; postpronotum with 1 long seta and several additional much shorter setae; acrostichals biserial, setae slightly longer than distance between acrostichals and dorsocentrals (about 8-10 setae in one row); dorsocentrals irregularly 2-3-serial, as long as acrostichals, inner row ending in 2 long prescutellars, outer row slightly diverging outwards; 1 presutural and 2 postsutural intra-alars, 1 presutural supra-alar; notopleuron with 3 long setae; 1 postalar seta, 2 pairs of long scutellars, outer pair shorter. Laterotergite bare. Legs including coxae brownish black, microtrichose, all “knees” and bases of tibiae yellow to various extent (in darkest specimens only “knees” yellowish, and in lighter specimens up to third of fore and mid tibiae brownish yellow and hind basitarsus partly yellowish), most setae and setulae black, largest setae (all setae on coxae, posteroventrals on fore femur and both antero- and posteroventrals on hind femur partly or entirely pale - variable). Fore femur short setulose, posteroventral row of setae as long as femur depth or slightly longer, posterodorsals slightly shorter than femur depth, anteroventrals much shorter. Fore tibia narrow, without conspicuous setae; fore basitarsus with two subbasal and slightly elongate setulae ventrally. Mid femur short setose, with long preapical anteroventral seta and row of posteroventrals. Mid tibia narrow, short setulose, with single rather long dark preapical ventral seta. Hind femur slightly widened, with rows of dorsal and anteroventral setae nearly as long as femur depth (longest dorsals situated on basal half and longest anteroventrals on apical third). Hind tibia clavate (slightly wider than hind femur), uniformly short setulose; hind basitarsus very slightly dilated. Wing with slight brownish tinge, covered with microtrichia, Sc incomplete, stigma brown, radial veins yellowish brown, remaining veins brownish yellow, anal vein complete and depigmented, axillary angle slightly obtuse, C terminating at M1+2, basal costal seta black and long. Halter brownish black, calypter whitish with short pale fringes. Abdomen blackish brown, microtrichose, most setae pale (yellow to white), those on dorsal part of tergites, posterior three segments and sometimes posterior sternites black (variable). Lateral marginal setae on tergites nearly as long as corresponding segments; discal setae short, forming almost regular row. Hind marginal setae on segment 8 long; sternites with 5-8 pairs of pale long setae, sternite 1 setose. Genitalia as in Figs 3 , 4 : generally very similar to other Atelestus spp., hypandrium short, triangular, without processes; epandrium ovoid, in posterior view ending with small process. Length: body 2.0-2.7 mm, wing 2.0-2.2 mm.

Female. unknown.

Remarks.

The new species described above is rather similar to A. turcicus sp. nov. in having a partly pale setose body, small body and wing size, and short setulose hind tibia. The main difference is the black setose thorax in A. ibericus sp. nov., but pale setose in A. turcicus sp. nov. See also remarks under A. turcicus sp. nov.

Figures

Figures 3, 4. Atelestus ibericus sp. nov., male genitalia 3 ventral view 4 dorsal view.