Phasia siberica Sun, 2003

Sun, Xuekui & Marshall, Stephen A., 2003, Systematics of Phasia Latreille (Diptera: Tachinidae), Zootaxa 276 (1), pp. 1-320 : 152-153

3.5.13 Phasia siberica Sun , sp. nov.

(Figures I­56, II­5.1)

TYPE MATERIAL

Holotype ♀, U.S. S.R. [ Russia], Siberia, Novosibirsk Region, Chany Lake Biological Station, near Zdvensk, on flowers, 1­5.vii.1991, S.A. Marshall (CNCI).

DESCRIPTION

Body length: 6.5 mm.

FEMALE: HEAD. Head spherical or nearly so. Eyes separated by a distance as wide as single ocellus. Fronto­orbital plate black, shiny grey pruinose. Frontal vitta triangle, black. Frontal vitta at base of antennae 2.1 times as wide as fronto­orbital plate anteriorly. Ocellar setae present but fine; outer vertical setae present; inner vertical setae absent. Face black with grey pruinosity. Parafacial black with grey pruinosity, bare, 0.9 times as wide as first flagellomere. Lower margin of face projecting, visible in profile, black with grey pruinosity. Vibrissa well differentiated; intervibrissal distance 1.6 times distance between vibrissa and eye on same side; facial ridge with bristles on lower 1/5. Gena black with grey pruinosity; hairs white; height 0.1 times eye height. Lunule black and shining; sublunular bulla indistinct. Antenna black; first flagellomere 1.5 times as long as pedicel; arista thickened on basal 0.35. Length of oral opening 1.8 times its width. Occiput flattened, white pruinose; hairs black. Palpus brown.

THORAX. Mesoscutum shining, without pruinosity, with fine black hairs. 0+1 acrostichal seta; 2 postpronotal setae; presutural supra­alar seta present, strong; postsutural intra­alar seta absent; 2 notopleural setae; 1 supra­alar seta; 2 postalar setae. Pleuron thinly grey pruinose; hairs black. Anepimeral setae hair­like, black; 1 katepisternal seta; 5­6 meral setae. Scutellum black, shining, without pruinosity, with two pairs of marginal setae; apical setae present and distinct; discal setae randomly arranged, not in rows. Subscutellum not very prominent. WING. Lower calypter hyaline white. Wing base without scalelike setae. Tegula black. Basicosta black. Wing hyaline, narrow; petiole of apical cell 0.45 times as long as preceding section of R 4+5; M meeting R 4+5 almost at right angle. Halter brown. LEGS. Fore femur black; hairs black. Fore tibia black, without bristles, apically with 1 pv and 1 d. Fore tarus black. Fore claws black; 1.1 times as long as fifth tarsomere. Pulvilli brown. Mid femur black; hairs black. Mid tibia black, with 1 ad and 1 v, apically with 1 ad, 1 av, 1 pv, 1 v and 1 d. Hind femur black; hairs black. Hind tibia black; with one row of ad and pd. Anterior spine­like setae of hind tibia well developed.

ABDOMEN. Abdominal tergites black. Relative length of abdominal tergites I+II:III:IV:V = 1.4:1:1:1.1; relative width I+II:III:IV:V = 0.6:1:1:0.8. Syntergite I+II shiny, not pruinose. Pruinosity of tergite III greyish yellow; median area shiny anteriorly. Pruinosity of tergites IV, V greyish yellow; hair spots indistinct. Sternite VII (sheath) longer than sternite VI, tapered, pointed apically, not bent, apex straight, sternite VII with linear wrinkles ventrally. Ovipositor bent upward.

MALE: Unknown.

HOST

Unknown.

ETYMOLOGY

The name Phasia siberica reflects the fact that this species is known only from Siberia.