Atelestus turcicus 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 turcicus Bartak sp. nov. Figs 1 , 2

Type material.

Holotype ♂, Turkey: Muğla, University campus, MT, 720 m, 37°09'42"N, 28°22'13"E, H. Kavak, 26.v.-26.vi.2015 (CULSP). Paratypes: 7 ♂, 1 ♀, same data as holotype; 1 ♀, Turkey: 13 km NE of Muğla, pasture/pine wood, 1200 m, 37°14'50"N, 28°30'E, Barták, Kubík, 23.-27.vi.2015; 1 ♂, Turkey: Muğla, University campus, YPWT, 720 m, 37°09'42"N, 28°22'13"E, Barták, Kubík, 26.-27.vi.2015; 3 ♂, Turkey: Muğla, University campus, SW [= sweeping]+PT, 700 m, 37°09'42"N, 28°22'21"E, Barták, Kubík, 17.-22.v.2011; 2 ♂, same locality, O. Dursun, May 2013; 21 ♂, 4 ♀, Turkey: Muğla, University campus, MT, 720 m, 37°09'42"N, 28°22'13"E, H. Kavak, May 2015; 3 ♂, same locality, H. Pala, June 2016; 2 ♂, same locality, H. Pala, July 2016 - (CULSP).

Diagnosis.

Small brownish black, pale (white to yellow) setose species of Atelestus . Male genitalia: anterior part of gonocoxal apodeme short (at most 0.10 mm long), postgonites serrate, and hypandrium in ventral view nearly square-shaped, with long posterior lobes pointed upwards. Female frons shiny.

Etymology.

The species is named after country of origin (Turkey).

Description.

Male head black, holoptic, entirely rather light grey microtrichose, white setose (except several dark setulae on labellum). Eye large, ventral third with smaller facets sharply divided with horizontal line from dorsal part with much larger facets. Occiput in dorsal part with row of short postocular setae (setae about as long as ocellar triangle), in lower part more densely short setose. Frons (very small triangle above antennae) without setae. Face including clypeus and gena microtrichose, without setae, postgena with several longer setae (about as long as ocellars). Ocellar setae short (about 0.15 mm). Palpus brown, slightly clavate, with several short setulae; labrum very short (about 0.08 mm), postmentum microtrichose, with several setae, labellum broad, covered with brownish setulae. Antenna black, pedicel with circlet of very short setulae (0.03 mm); postpedicel broadly pear-shaped; length of antennal segments (scape: pedicel: postpedicel: 1st segment of stylus: stylus, in 0.01 mm scale) = 3: 4: 7-10: 1-2: 23-26. Thorax brownish black, sparsely grey microtrichose, without stripes, whitish to yellowish setose. Chaetotaxy: antepronotum with 1-3 rather long setulae, propleura with 1-2 similar setulae, proepisternum and prosternum without setae; postpronotum with 1 long seta and several additional much shorter setae; acrostichals biserial, setae about as long as distance between acrostichals and dorsocentrals (about 7-9 setae in one row); dorsocentrals irregularly biserial as long as acrostichals, inner row ending in 2 long prescutellars, outer row diverging and curved towards postpronotal lobe anteriorly; 1 presutural and 2 postsutural intraalars, 1 presutural supraalar; notopleuron with 3-4 strong and 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 basal third to fourth of fore and mid tibiae and basal fifth of hind tibiae pale and in lighter specimens up to half of fore and mid tibiae yellow and basitarsi partly yellowish brown), most setae and setulae pale, tarsi partly dark setulose. Fore femur short setulose, posteroventral row of setae nearly as long as femur depth, anteroventrals much shorter. Fore tibia narrow and without conspicuous setae, fore basitarsus with several elongate setulae ventrally. Mid femur short setose, with long preapical anteroventral seta and several posteroventrals on apical part. 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 ”club-shaped“, uniformly short setulose, hind basitarsus very slightly dilated. Wing clear, covered with microtrichia, Sc incomplete, stigma brown, radial veins brown, remaining veins yellowish, anal vein complete and depigmented, axillary angle slightly acute, C terminating at M1+2, basal costal seta pale and relatively short. Halter brownish black, calypter pale with short yellow fringes. Abdomen blackish brown, microtrichose, pale (yellow to white) setose. Lateral marginal setae on tergites nearly as long as segments; discal setae short, forming almost regular row, tergites 7 and 8 desclerotized and without setae. Hind marginal setae on segment 8 short; sternites with 5-8 pairs of pale setae, sternite 1 setose. Tergite 8 L-shaped as in other Atelestus spp., vertical narrow part bare, horizontal lower part broader and armed with 1-3 short setae, sternite 8 divided into two separate sclerites, each with 2-4 short setae. Genitalia as in Figs 1 , 2 : generally very similar to remaining three Atelestus spp., hypandrium short, roughly rectangular (lateral margins nearly parallel), desclerotized in middle part, with posterior hypandrial lobes directed upwards (similarly as in Fig. 9 ); epandrium ovoid, in posterior view ending with blunt tip. Length: body 2.0-2.8 mm, wing 1.5-2.1 mm.

Female. Similar to male except the following: frons broad, entirely shiny including vertex, ocellar triangle and occiput microtrichose. Frons with submedian pair of setae subequally long and strong as verticals and pair of ocellars, ocellar triangle with additional two pairs of smaller setulae. Abdomen very short setose. Legs somewhat paler than in male, often also apex of coxae yellowish; hind tibia less distinctly clavate. Cercus long and slender. Length: body 1.8-2.3 mm, wing 2.4-2.9 mm.

Remarks.

The new species described above may be easily recognized by the entirely pale (white to yellow) setose body. It is rather similar to A. ibericus sp. nov. in having a small body and wing size, and a short setulose hind tibia. The shiny female frons is similar to A. dissonans , but this character remains unknown in female of A. ibericus sp. nov. There are several small differences in genitalia between three similar small species: A. ibericus sp. nov. has a long anterior part of the gonocoxal apodeme (about 0.20 mm long; Figs 3 , 4 ) and unserrated postgonites. In both A. turcicus sp. nov. and A. dissonans the anterior part of the gonocoxal apodeme is short (at most 0.10 mm long) and the postgonites are serrated. The hypandrium in A. dissonans forms almost an equilateral triangle in ventral view with posterior lobes pointed upwards; in A. turcicus the hypandrium is nearly square-shaped in ventral view, with long posterior lobes pointed upwards; in A. ibericus sp. nov. the hypandrium is short triangle-shaped, without posterior lobes. Additionally, in A. pulicarius the hypandrium forms an elongated (isosceles) triangle with posterior lobes pointed posteriorly.

Figures

Figures 1, 2. Atelestus turcicus sp. nov., male genitalia 1 ventral view 2 dorsal view. GAP = gonocoxal apodeme, PGN = postgonites.

Figures 8, 9. Atelestus species 8 A. pulicarius (Fallen, 1816), hypandrium, lateral view 9 A. dissonans Collin, 1961, hypandrium, lateral view. PL = posterior lobes.

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