Strongylophthalmyia orchidanthae, 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 : 126-128

Taxon classification Animalia Diptera Strongylophthalmyiidae

Strongylophthalmyia orchidanthae sp. n. Figure 6

Type material.

Holotype: 1 male, Vietnam, Phu Tho province, Thanh Son district, Xuan Son National Park, (21°6'45"N, 104°57'25"E.), 23.X.2014 (T.V. Galinskaya). ZMUM.

Diagnosis.

Strongylophthalmyia orchidanthae sp. n. is superficially similar to the Strongylophthalmyia lutea species group in having a yellow thorax. Strongylophthalmyia lutea species group is characterized by vein R2+3 short and section of C between R1 and R2+3 0.7 times shorter than distal section between R2+3 and R4+5. The new species has section of C between R1 and R2+3 approximately equal to distal section. This new species is similar to Strongylophthalmyia immaculata Hennig, 1940 from Formosa, which is included in the Strongylophthalmyia lutea group, i.e. characterized by short vein R2+3. but Strongylophthalmyia immaculata differs from Strongylophthalmyia orchidanthae by armed fore femur, abdomen entirely black, mesonotum without pair of brown longitudinal stripes, wing transparent. Strongylophthalmyia nigriventris Frey, 1928 from Philippines, Malaysia and Papua New Guinea is characterized by a pair of brown stripes coalesced in anterior part of mesonotum, as in this new species. It differs from Strongylophthalmyia orchidanthae sp. n. by abdomen entirely black, legs entirely yellow and pedicel yellow, first flagellomere brownish.

Description.

Male.Head yellow, 1.3 times longer than height, ocellar tubercle small, black; frons slightly widened towards vertex, frontal index equal to 1.3. Occiput slightly convex. Face yellow with row of yellow setulae along suture. Parafacial covered with silvery grey tomentum. Antenna yellow, pedicel black. First flagellomere slightly brownish basally, its length around 0.9 times shorter than high. Arista dark yellow, bare. Mouthparts and palpus yellow. Chaetotaxy: three orbital setae, 1 ocellar seta, 1 postocellar seta, 1 inner vertical seta, 1 outer vertical seta.

Thorax yellow with anterior 3/4 of presutural scutum black with one pair of black lines continuing along dorsocentral rows onto sides of scutellum. A pair of postsutural longitudinal stripes not merged with anterior arcuate area; in posterior part of mesonotum these stripes continued on scutellum. Scutellum yellow with black border laterally. Mediotergite blackish brown. Legs yellow, with coxae and tarsi white, two distal tarsal segments brown. Mid femur with light brownish preapical ring, mid tibia with brown subbasal band. Hind femur with light brown subapical ring; hind tibia with brown subbasal band; basal segment of hind tarsus darkened. Wings with brown apical spot and cross-band at level of vein dm-cu. Vein R2+3 long: section of C between R1 and R2+3 nearly 1.1 times longer than section between R2+3 and R4+5. Section of M1+2 between r-m and dm-cu nearly 2.3 times longer than proximal section and 0.7 times shorter than distal section. Posterior basal cell approximately 0.6 times shorter than discal cell. Calypter yellowish with fan of very long yellow setulae on margin. Halter with yellow stem and whitish knob. Chaetotaxy: one very small postpronotal seta, one dorsocentral seta, two notopleural setae, one supraalar seta, one postalar seta, one anepisternal seta, one stout apical scutellar seta.

Abdomen yellow, tergite 1-2 with pair of black longitudinal stripes, tergite 3 with pair of light brown median spots, tergite 4 with large black triangular spot, tergite 5 with narrow dorsal band on anterior ¾. Sternite 8 large, situated on dorsal side, with large black spot. Epandrium yellow apically, brown basally.

Body length 4.3 mm; wing length 3.1 mm.

Female unknown

Etymology.

The new species was collected on Orchidantha ( Zingiberaceae ).