Strongylophthalmyia gavryushini, Galinskaya, Tatiana V. & Shatalkin, Anatoly I., 2016

Galinskaya, Tatiana V. & Shatalkin, Anatoly I., 2016, Eight new species of Strongylophthalmyia Heller from Vietnam with a key to species from Vietnam and neighbouring countries (Diptera, Strongylophthalmyiidae), ZooKeys 625, pp. 111-142 : 123-125

Taxon classification Animalia Diptera Strongylophthalmyiidae

Strongylophthalmyia gavryushini sp. n. Figure 4

Type material.

Holotype: 1 male, Vietnam, Lai Châu Province, Sa Pa env. (22.3872°N, 103.7867°E), 1682 m, 25.V.2014 (D. Gavryushin) ZMUM

Diagnosis.

Species of Strongylophthalmyia are characterized by a slight shift of the ocellar tubercle anteriorly and in some species, the ocellar tubercle can be situated in the middle of the frons. Strongylophthalmyia gavryushini sp. n., however, has the ocellar tubercle positioned nearly on the edge of the vertex. The value of frontal index (the ratio between height of the frons from its anterior margin to hind ocelli and from hind ocelli to vertex or vti) is high, equal to 4.3. The frontal index of the other new species of Strongylophthalmyia described in this paper vary from 1 up to 1.7. Only Strongylophthalmyia tomentosa sp. n. has the frontal index equal to 2.7.

The new species is characterised by fore femur with row of ten black setae dorsally and with row of long dense yellowish setulae bent lateroapically aside of femoral apex, proximally these setulae 1.3 longer than distally. Tergite six with long black setulae dorsally and 6-7 long yellowish setulae laterally (Figure 4b). The new species is close to Strongylophthalmyia trifasciata Hennig. Males of these species are similar by abdomen partially yellow. Strongylophthalmyia trifasciata differs by wing with a short cross-band in anterior part at a level of Rs. At least last abdominal tergites of male are yellow, with black transverse band, tergite six with patch of thick black setae laterally (fig. 20 in Hennig 1941).

Description.

Male.Head yellow, length almost equal to its height. Frons yellow, black shining posteriorly to hind margin of ocellar tubercle. Frontal index 4.3. Occiput black, slightly convex. Gena yellow. Face yellow, with row of short setulae along suture. Parafacial covered with silvery grey tomentum. Antenna light yellow. First flagellomere 1.6 times longer than width, with short yellow dorsal marginal setulae. Arista dark brown, basally yellow, bare. Palpus yellow. Clypeus dark brown. Frons between upper orbital and outer vertical setae with one short setula. Chaetotaxy: Two orbital setae (anterior - 0.18 mm, posterior - 0.24 mm); 1 ocellar seta, 1 postocellar seta, 1 inner vertical seta, 1 outer vertical seta, 1 hair-like very short frontal seta.

Thorax black. Postpronotum laterally and dorsally, propleuron, anepisternum around spiracle yellow. Mesonotum matte, sparsely covered with short yellow setulae; pleuron shiny; scutellum bare, matte. Legs yellow, mid and hind femora with dark brown preapical ring, hind femur brownish basally; mid tibia with brownish spot in basal quarter; hind tibia brown, yellow basally and apically. Fore femur with prominent row of ten black setae dorsally and with row of long dense yellowish setulae bent lateroapically aside of femoral apex, proximally these setulae almost as long as femor width. Mid tibia with two spurs, yellow and black, both 0.1 mm. Wings with apical spot, median transverse band at level of dm-cu and with weak darkening in anterior part at level of Rs. Vein R2+3 long, merged with C vein far from the level of dm-cu: section of C between R1 and R2+3 1.6 times longer than section between R2+3 and R4+5. Veins R4+5 and M1+2 almost parallel apically. Section of M1+2 between r-m and dm-cu nearly 1.5 times longer than proximal section and around 0.6 times shorter than distal section. Cell bm approximately 0.4 times shorter than discal cell. Calypter brownish grey with fan of very long dark setulae on margin. Halter with yellow stem and whitish knob. Chaetotaxy: two small postpronotal seta, one dorsocentral seta, two notopleural setae, one supraalar seta, one postalar seta, one anepisternal seta, one stout apical scutellar seta (0.42 mm). All setae black.

Abdomen yellow, matte, with light brownish spots and strips (Figure 4b). Tergites with long dark brownish setulae, length of these setulae increased posteriorly; tergite six with 6-7 long yellowish setulae laterally.

Body length 3.4 mm; wing length 3.2 mm.

Female unknown

Etymology.

The species is named after our colleague Dr. D.I. Gavryushin.