Strongylophthalmyia basisterna, 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 : 119-122

Taxon classification Animalia Diptera Strongylophthalmyiidae

Strongylophthalmyia basisterna sp. n. Figure 2

Type material.

Holotype: 1 female, Vietnam, Lai Châu Province, Hoáng Liên (22.347948°N, 103.769714°E), 1700 m, 22.V.2014 (A.L. Ozerov). Paratype: 1 female, Vietnam, Lai Châu Province, Hoáng Liên (22.347948°N, 103.769714°E), 1900 m, 22.V.2014 (A.L. Ozerov); 1 female, Vietnam, Lai Châu Province, Sa Pa env. (22.3872°N, 103.7867°E), 1682 m 23.V.2014 (D. Gavryushin) ZMUM.

Diagnosis.

This new species strongly differs from all species from Vietnam and neighbour countries. It is morphologically close to Strongylophthalmyia puncticollis Frey, 1928 (from Philippines and Papua New Guinea) and to Strongylophthalmyia fasciolata Meijere, 1919 (from Sumatra). Strongylophthalmyia puncticollis differs from the new species by having the abdomen entirely black; all femora have a brown preapical ring, the hind tibia is black basally and apically and yellow in the median third. Strongylophthalmyia fasciolata differs from the new species by an entirely black abdomen, black matte mesonotum, dark legs, and halteres with a brownish stem. In the key by Steyskal (1971) Strongylophthalmyia fasciolata is close to Strongylophthalmyia angusticollis Frey, 1956 (from Burma). The last species is characterized by the arista covered with short setulae.

Description.

Female.Head black, 1.3 times longer than height. Frons matte with yellowish brown spot between antenna and eye. Ocellar tubercle slightly shifted anteriorly: the ratio between height of the frons from its anterior margin to hind ocelli and from the hind ocelli to the vertex or vti equal to 1.3. Occiput poorly convex (in dorsal view). Face dark brown, matte, with row of short setulae along suture. Parafacial yellow, covered with whitish tomentum, setulae on parafacial around 0.5 times shorter than setulae along facial suture. Antenna dark brown. First flagellomere 1.1 times longer than high, dark brown with long yellowish marginal setulae. Arista dark brown, bare. Mouthparts dark, palpi darkish brown. Chaetotaxy: two reclinate to lateroclinate orbital setae (posterior seta 2.0 times longer than anterior), 1 oc, 1 poc, 1 vti, 1 vte, frontal setae absent.

Thorax black, shining. Basisternum with two bright yellow spots between fore coxae; yellowish brown stripe extended from postpronotum over anterior spiracle to coxa. Mesonotum shining, with 4 rows of short yellow setae along dc and ac rows. Scutellum matte. Legs yellow, mid and hind femur with preapical brown ring (this ring narrower on mid femur); mid and hind tibiae with subbasal brownish ring; two last tarsal segments black. Wings with apical spot, median transverse band through dm-cu and with weak darkening in anterior part of Rs. Right border of median band situated slightly laterally to R2+3 vein. R2+3 long: section of C between R1 and R2+3 1.3 times longer than following section (between R2+3 and R4+5). R4+5 and M1+2 almost parallel apically. Section of M1+2 between r-m and dm-cu slightly concave, 3 times longer than proximal section and 0.9 times shorter than distal section. Cell bm 0.5 times shorter than discal cell. Calypter brownish yellow with fan of very long yellowish setulae on its margin. Halter with yellow stem and whitish knob. Chaetotaxy: one small pprn, one pprn, one dc, ac in two rows, two npl, one sa, one pa, one anepst, scutellum with a pair of stout setae apically. All setae black.

Abdomen black, shiny; tergite 4 laterally, tergite 5, 6 totally yellow.

Body length 5.6 mm (5.5 and 6.5 in paratypes); wing length 5.2 mm (5.2 and 5.3 in paratypes).

Male unknown.

Etymology.

The specific name refers to the two bright yellow spots on basisternum.