Strongylophthalmyia stricta, 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 : 129

Taxon classification Animalia Diptera Strongylophthalmyiidae

Strongylophthalmyia stricta sp. n. Figure 7

Type material.

Holotype: 1 male, Vietnam, Lai Châu Province, Sa Pa env. (22.330396°N, 103.82418°E), 1284 m, 12.IV.2012 (A.L. Ozerov) ZMUM. Paratypes: 1 male, Vietnam, Lai Châu Province, Sa Pa env. (22.1454°N, 103.8053°E), 1448 m 21.V.2014 (D. Gavryushin); 1 female, Vietnam, Lai Châu Province, Hoáng Liên (22.347948°N, 103.769714°E), 1900 m, 22.V.2014 (A.L. Ozerov).

Diagnosis.

Strongylophthalmyia stricta sp. n. and Strongylophthalmyia obtecta sp. n. have the thorax with 2 dc and two rows of black setulae on the line of dc with one large setula before transverse suture, 2 rows of long black ac. Based on these characters both species are close to Strongylophthalmyia raricornis Shatalkin, 1981; Strongylophthalmyia raricornis differs from two new species by first flagellomere bilobate. Strongylophthalmyia obtecta sp. n. differs from Strongylophthalmyia stricta sp. n. by fore femur and tibia yellow; two distal segments of tarsi black (instead of three distal segments in female of Strongylophthalmyia stricta sp. n.).

Description.

Head entirely black, its length equal to its height. Frons shining, entirely black. Occiput slightly convex. Face brownish, with row of short setulae along suture. Parafacial covered with short silvery grey tomentum. Antenna yellowish brown, first flagellomere 1.5 times longer than high. First flagellomere yellow with dorsum dark brown, with long pale marginal setulae. Arista dark brown, bare. Mouthparts and palpus black. Chaetotaxy: Three orbital setae, 1 ocellar seta, 1 postocellar seta, 1 inner vertical seta, 1 outer vertical seta, 3 hair-like short frontal setae.

Thorax black. Postpronotum laterally, proepisternum, anepisternum behind anterior spiracle yellowish brown, shining. Mesonotum matte, with rows of black setulae; 1+3 large dorsocentral setae; pleuron shining; scutellum matte. Legs. Fore coxa black with anterolateral margin of fore coxa yellowish and mid and hind coxae yellowish distally, fore femur black, narrowly yellowish basally and apically; mid and hind femora black; fore tibia yellow with brownish ring in basal third; mid and hind tibia black, tarsi yellow, two distal segments black. Hind trochanter with a posterior round blackish spot; hind femur basally with round posteroventral process, without 3-4 ventral setulae (as in male of Strongylophthalmyia papuana ), and with small subbasal black posterior process with two yellow setulae on it and with two yellow setae on trochanter distally to this process. Wings with apical spot, median transverse band at level of dm-cu and light brown spot anteriorly at level of Rs. Distal border of median band reaching apex of vein R2+3. Vein R2+3 long: section of C between R1 and R2+3 1.3 times longer than penultimate section (between R2+3 and R4+5). Veins R4+5 and M1+2 almost parallel apically. Proximal section of M1+2 between r-m and dm-cu 2.7 times longer than proximal one and 0.7 times shorter than distal one. Cell bm 0.4 times shorter than discal cell. Calypter brownish grey, with fan of very long light setulae on margin. Halter with brownish stem and whitish knob. Chaetotaxy: one small postpronotal seta, 1+3 dorsocentral setae, two rows of acrostichal setulae, two notopleural setae, one supraalar seta, one postalar seta, one anepisternal seta, one stout apical scutellar seta and one short discal scutellar seta in front of apical seta. All setae black.

Abdomen black, shining, with two yellowish spots dorsally on first tergite.

Body length 3.3 mm; wing length 2.9 mm.

Female differs by having three black distal tarsal segments; abdomen totally black; trochanter without processes.

Body length 4.8 mm; wing length 4.2 mm.

Etymology.

Strongylophthalmyia stricta is characterized by a dense field of adjoining setulae on the scutum that are sticking out or protrusive (strictus in Latin), and rarely ordered in regular lines.