Nanna cryophila Ozerov & Krivosheina, 2015, sp. nov.

Nanna cryophila sp. nov.

Figs 94–99.

Material examined. Holotype ♂, “ RUS. Khabarovsk reg. Khicha R. 690 m 49.05N 139.43E 10.VI.2014, N. Vikhrev” (ZMUM). Paratypes: same label as holotype (1 ♂, ZMUM); “ RUS. Khabarovsk reg. Khabarovsk 48.6N 135.1E 2–6.VI.2014, N. Vikhrev” (1 ♀, ZMUM); “ RUS. Khabarovsk reg. Vanino 49.1N 140.31E 9.VI.2014, N. Vikhrev” (3 ♂♂, ZMUM); “ RUS. Khabarovsk reg. Kirpichny R. 49.261N 140.33E 11.VI.2014, N. Vikhrev” (1 ♂, ZMUM); “ RUS. Magadan reg. Sokol env. 69.92N 150.71E 11–19.VII.2014, N. Vikhrev” (1 ♂, ZMUM). The follows labels written in Russian: Kamchatka Kray: Sivuchiy Island (56.3605N 162.708E), 26.VI.1908, A. Derzhavin (1 ♀, ZISP); River Kichiga (ca. 59.8277N 163.3969E), 30.VII. ???7, Smetanin (1 ♀, ZISP); Khabarovsk Kray: lateral channel Malyshevskaya (48.7119N 135.5637E), 27.V.1910, Soldatov (1 ♀, ZISP); Tyumen' Oblast: Neroyka (ca. 64.57N 59.67E), 700 m, 29.VI.1990 and 30.VI.–3.VII.1990, Malozemov (2 ♂♂, ZISP).

Description. Male, female. Body-length 4.2–5.0 mm. Head. Frons yellow or black in upper half, matt. Ocellar triangle black. Fronto-orbital plate greyish dusted. Face, parafacial and gena pale yellow. Postcranium black, greyish dusted, covered with yellow hairs and black setulae and with row of postocular setae. Setae: 2–3 orbital, 2– 3 frontal, 1 ocellar, 1 inner vertical, 1 outer vertical (short), 1 postocellar; 1 pair of strong vibrissae and 1 pair of short subvibrissae present. Antenna black. Postpedicel with acutely angled upper apical corner, approximately 2– 2.5 times as long as wide. Arista black, bare. Palpus long, yellow. Clypeus and proboscis black.

Thorax black, greyish dusted. Scutum with following setae: acrostichals short in two rows, prescutellar pair not differentiated or only slightly longer than other acrostichals, dorsocentrals 3+3, intra-alars 1+2, supra-alars 1+2, postpronotals 2, notopleurals 2, postalars 2. Proepisternum with hairs in central part, with 1–3 setae near lower margin. Proepimeron with 1 seta. Anepisternum covered with hairs in posterior half and with 1 black and 2–3 pale setae along posterior margin. Katepisternum covered with long setae in ventral corner and 3 strong setae (the setae pale in male, black in female). Anepimeron bare. Scutellum black, with pair of strong lateral scutellar setae and pair of apical setulae.

Legs yellow, only tarsi slightly darkened. Male coxae inside with pale yellow hairs. Fore femur with row of anterodorsal setae; in male with 1–2 pale posteroventral setae, in female with 1 black posteroventral seta on basal half. Fore tibia with 1 posterodorsal, 1 anterodorsal at middle, 1 preapical dorsal, and 1 posterior apical setae. Mid femur with row of anterior, 1–2 anteroventral, 1 preapical posterior, and 0–1 preapical anterior setae. Mid tibia with 1 posterodorsal, 1 anterodorsal at middle, 1 anterior (anteroventral) setae, and ring of apicals. Hind femur with row of anterodorsal, 0–1 preapical posterodorsal and 2–3 dorsal setae; in female also with 1 ventral seta. Hind tibia with 2 anterodorsal, 2 posterodorsal, 1 anteroventral, 1 preapical dorsal setae, and ring of apicals, including posteroventral apical seta.

Wing clear with brownish veins; vein R1 bare. Calypters, margins of calypters, and halteres yellowish.

Abdomen black, greyish dusted, covered with pale hairs in male and black short hairs in female. Tergites 2–6 each with row of marginal setae. Male sternite 4 as in Fig 98; sternite 5 with black lobes (Fig. 95). Epandrium, cerci and surstyli as in Figs 96, 97. Female tergite 7 desclerotized in middle, it lateral margins fused with lateral margins of sternite 7 forming syntergosternite; sternite 8 as two small separate sclerites.

Etymology. The specific epithet cryophila is derived from the Greek words kruos (cold, frost) and phileo (friend, loving), and means “living where it is cold”.

Comparison. See key to species below.

Distribution. Russia (Fig. 99): Kamchatka Kray, Khabarovsk Kray, Magadan Oblast, Tyumen' Oblast.