Scathophaga obscurinervis ( Becker, 1900 )

Ozerov, A. L. & Krivosheina, M. G., 2021, A review of the genus Scathophaga Meigen, 1803 (Diptera: Scathophagidae) of Russia, Russian Entomological Journal 30 (2), pp. 201-246 : 233

Scathophaga obscurinervis ( Becker, 1900)

Figs 35, 106–108.

obscurinervis Becker, 1900: 55 ( Scatophaga ). Type-locality: “ Insel Nikander und Dudinka” [Dudinka, Nikandrovskie Islands; NW Dudinka, River Yenisey] ( Russia: Krasnoyarsk Krai).

REMARK. This species was registered in Russia for arctic zone of European part (e.g., Dolgii I., Kolguev I.) [ Gorodkov, 1986: 33; Engelmark, 1999: 158, 159; Ovchinnikov, Makarova, 2016: 217], Siberia [ Becker, 1900: 55; Ozerov, Barkalov, 2014: 564] and Chukotka [ Ozerov, Krivosheina, 2014: 218].

MATERIAL EXAMINED. Arkhangelsk Oblast: Kolguev I., Bugrino (68.782ºN 49.309ºE), 20–22.VIII.1970, Gorodkov (6 ♂♂, 6 ♀♀, ZISP); Nar’yan-Mar (67.636ºN 53.031ºE), 3.VIII.1978, Gorodkov (2 ♂♂, 1 ♀, ZISP); River Silova-Yakha (ca. 68.558ºN 64.817ºE), 80 km N of Khal’mer’yu, 19.VII.1961, Gorodkov (6 ♂♂, 4 ♀♀, ZISP); Chukotka: Pevek (69.702ºN 170.298ºE), 3.VII.1963, Gorodkov (1 ♂, ZISP); Krasnoyarsk Krai: 104 km NNW of Noril’sk, River Nizhnyaya Agapa (ca. 70.097ºN 86.688ºE), 26–27.VII.1973, Sukacheva & Zherikhin (1 ♂, ZISP); River Pyasina (ca. 72.359ºN 90.582ºE), 90 km S of Tareya, 23.VII.1967, Gorodkov (2 ♂♂, ZISP); Ust’-Tareya (73.252ºN 90.596ºE), 14– 15.VII.1967, Gorodkov (15 ♂♂, 10 ♀♀, ZISP); Tyumen’ Oblast: 75 km WSW of Samburg (ca. 67.035ºN 76.541ºE), 7–9.VIII.1976, Gorodkov (24 ♂♂, 20 ♀♀, ZISP); 83 km W of Tazovskiy (ca. 67.466ºN 76.762ºE), valley of the River Khaddute, 29.VIII.1977, Gorodkov (5 ♂♂, 4 ♀♀, ZISP); 87 km NW of Tazovskiy (ca. 67.522ºN 77.807ºE), floodplain of the Khariyanog River, 29.VII.1977, Gorodkov (4 ♂♂, 2 ♀♀, ZISP); 90 km W of Samburg (ca. 67.035ºN 76.541ºE), 28.VII.1977, Gorodkov (6 ♂♂, 4 ♀♀, ZISP) Lake Yambuto (71.314ºN 80.003ºE), VI –VII.1908, B.M. Zhitkov (Exspedition I. Russk. geogr. obshchestva to Yamal in 1908) (1 ♂, ZISP); Lake Yaroto-Puykovo (70.766ºN 75.750ºE), VII–VIII.1908, B.M. Zhitkov (Exspedition I. Russk. geogr. obshchestva to Yamal in 1908) (1 ♂, ZMUM); Tabotarka River Basin (67.477ºN 70.558ºE), VII–VIII.1908, B.M. Zhitkov (Exspedition I. Russk. geogr. obshchestva to Yamal in 1908) (1 ♀, ZISP); Yakutia: airport Saskylakh (71.934ºN 114.083ºE), 24.VII.1988, Gorodkov (3 ♀♀, ZISP); Chokurdakh (70.618ºN 147.895ºE), 20– 21.VII.1971, Gorodkov (1 ♂, 1 ♀, ZISP); Tiksi env. (71.635ºN 128.857ºE), 9.VII. and 10.VIII.1957, Gorodkov (1 ♀, ZISP); Oleneksoe Bay, Ystannakh-Khocho (72.58ºN 121.42ºE), 20.VIII.2010, A. Yadrenkin (2 ♀♀, ZMUM). See also Ozerov & Krivosheina [2014: 218] and Ozerov & Barkalov [2014: 564].

DESCRIPTION. Male. Female. Body-length 3.4– 5.2 mm.

Head. Frontal vitta yellowish-orange, matt; fronto-orbital plate black, densely greyish dusted. Face, parafacial and gena yellow, with whitish reflection. Postcranium black, densely greyish dusted. 3 orbital and 2– 3 frontal setae present. Scapus and pedicel reddish or black. Postpedicel black, approximately 2 times as long as wide. Arista bare. Palpus yellow.

Thorax black, densely greenish-grey dusted. Acrostichals setulose in two rows, dorsocentrals 2+3, intra-alars 1+2, supra-alars 1+2, postpronotals 2. Anepimeron covered with hairs. Scutellum black, greenish-grey dusted, with a pair of strong basal scutellar and a pair of strong apical scutellar setae.

Legs delicately greyish dusted. All coxae black; fore femur yellow completely or blackish basally; mid and hind femora, all tibiae and all tarsi yellow. Male fore femur without conspicuous setae. Female fore femur with a row of dorsal/posterodorsal setulae. Fore tibia with 1–2 anterodorsal, 1–3 posterodorsal, 1 posterior, 1 preapical dorsal, and 1 posterior apical setae. Mid femur with 1 preapical posterior seta in both sexes, additionally with a row of anterior/anterodorsal setae in female. Mid tibia with 2 posterodorsal, 1–2 anterodorsal, 1–2 anteroventral/ventral, 1 posterior setae and a ring of apicals. Male hind femur without conspicuous setae. Female hind femur with a row of anterodorsal setae. Hind tibia with 2–3 anterodorsal, 2–3 posterodorsal, 1–2 anteroventral, 1 preapical dorsal, 1 preapical anterodorsal, 1 apical anterior, 1 apical anteroventral, and 1 apical ventral setae.

Wing tinged with brownish; crossveins r-m and d-m strongly darkened.

Abdomen black, greenish-grey dusted, covered with hairs in male; female tergites 2–6 with marginal setulae. Male sternite 4 wider than long (Fig. 35); sternite 5 with wide triangular lateral lobes, without median processes ( Fig. 106 ). Epandrium, cercal plate and surstyli as in Figs 107, 108 .

DISTRIBUTION. Russia: arctic and subarctic from Arkhangelsk Oblast to Chukotka. — Europe (Scandinavia), North America ; a rare northern holarctic species .

Figures

Figs 106–114. Scathophaga obscurinervis (Becker) (106–108), S. pictipennis (Oldenberg) (109–111) and S. spurca (Meigen) (112– 114): 106, 109, 112 — male sternite 5; 107, 110, 113 — epandrium, cercal plate and surstyli, lateral view; 108, 111, 114 — same, dorsal view. 109–111 — after Ozerov, 2017, figs 4–6. Рис. 106–114. Scathophaga obscurinervis (Becker) (106–108), S. pictipennis (Oldenberg) (109–111) и S. spurca (Meigen) (112– 114): 106, 109, 112 — стернит 5 самца; 107, 110, 113 — Эпандрий, церки и сурстили, сбоку; 108, 111, 114 — то же, сверху. 109– 111 — по Ozerov, 2017, figs 4–6.