Gimnomera castanipes ( Becker, 1894 )

Ozerov, A. L., 2019, A review of the genus Gimnomera Rondani, 1866 (Diptera: Scathophagidae) of Russia, Russian Entomological Journal 28 (2), pp. 195-218 : 200-201

Gimnomera castanipes ( Becker, 1894)

Figs 10 , 30–32 .

castanipes Becker, 1894: 185 ( Cochliarium ). Type-locality: “St. Moritz” ( Switzerland).

The species was recorded for Russia as G. sibirica ( Engelmark, 1999) from Chukotka and Yakutia [ Engelmark, 1999] and later from Krasnoyarsk Krai (Taimyr) [ Ozerov & Barkalov, 2014].

MATERIAL. Buryatia: Mondy env. (51.6758ºN 100.9925ºE), 20.VII.1965, Gorodkov (1 ♂, ZISP) ; Chukotka: Pevek (69.7022ºN 170.2982ºE), 1.VII.1963, Gorodkov (1 ♂♂, 1 ♀, ZISP) ; 55 km N of Egvekinot (66.7956ºN 181.00052ºE), 29.VII.1963, Gorodkov (2 ♂♂, ZISP) ; Krasnoyarsk Krai: Ust’-Tareya (73.2527ºN 90.5962ºE), 26.VII.1967, Gorodkov (21 ♂, 20 ♀♀, ZISP) ; the River Pyasina, 90 km S of Ust’ - Tareya (ca. 72.3591ºN 90.5822ºE), 23.VII.1967, K. Gorodkov (1 ♀, ZISP) ; Agapa (ca. 71.412ºN 89.2689ºE), the River Pyasina , 15.VII.1967, Gorodkov (1 ♀, ZISP) ; Yakutia: Tiksi (71.6351ºN 128.8579ºE), 9.VII., 10–11.VIII.1957, Gorodkov (4 ♂♂, 5 ♀♀, ZISP) ; same, 20.VII.1971, Chernov (3 ♂♂, ZISP) ; Sikhtyakh (69.9117ºN 125.10415ºE), 1875, Chekanovskiy (1 ♂, ZISP) ; Chai-Tumus Vill. (72.3166ºN 125.7333ºE), 28.VII.1957, Gorodkov (1 ♂, 1 ♀, ZISP) .

DESCRIPTION. Male, female. Medium-sized flies (3.2–4.1 mm long).

Head. Frontal vitta from yellow to black, but usually black in upper half and yellow in lower part, matt; fronto-orbital plate from yellow to black, whitish dusted. Ocellar triangle black. Face and parafacial yellow, whitish dusted. Gena from yellow to black, whitish dusted. Postcranium black, usually subshining in upper third and greyish dusted in lower part. 2–3 orbitals, 2– 3 frontals, 1 ocellar, 1 small postocellar, 1 inner vertical, 1 outer vertical; 1–2 pairs of vibrissae present. Scapus and pedicel brownish; postpedicel black, approximately 1.5 times as long as wide. Arista black. Palpus brownish.

Thorax black, greyish dusted, only scutum with fore shining interrupted stripes (two linear between dorsocental setae and two wide between dorsocentral and supra-alar setae). Dorsocentrals (0–1)+1 (presutural small), intra-alars absent, supra-alars 0+2, 0–1 (small) postpronotal, anterior margin of postpronotum with short erect black spinules, notopleurals 2, postalars 2. Proepisternum with 1 seta near lower margin. Proepimeron with 1 seta and several hairs. Anepisternum with 1–2 setae near posterior margin. Anepimeron with several hairs. Scutellum black, with a pair of lateral scutellar and a pair of apical scutellar setae.

Legs from yellow to black, but apex of fore femur and fore tibia always yellow. Fore femur with 2–4 posterodorsal setae. Fore tibia with 1 dorsal/anterodorsal seta and 1 preapical dorsal setae. Mid femur with 1 preapical posterodorsal seta. Mid tibia with 0–1 anterodorsal, 1 preapical dorsal setae and a ring of apical setae. Hind femur with 1–4 anterodorsal and 1–4 anteroventral setae in apical half and 0–1 preapical anterior seta. Hind tibia with 1–2 anterodorsal, 0–1 posterodorsal, 1 preapical dorsal setae, also with 1 apical anteroventral seta.

Wing slightly brownish; veins brownish. Vein R 1 setulose on apical half of dorsal surface. Calypters, margins of calypters, and halteres from whitish to greyish.

Abdomen black, usually shining. Male sternite 4 rectangular, wider than long; sternite 5 transverse, with conical median lobes, carrying spinules ( Fig. 10 ). Epandrium, cercal plate and surstyli as in Figs 30–32 .

DISTRIBUTION. Russia: Buryatia, Chukotka, Krasnoyarsk Krai, Yakutia. — Central Europe [ Šifner, 2008] .

Figures

Figs 8–13. Male sternites 4 (lower) and 5 (upper) of Gimnomera: 8 — G. alanica (Ozerov); 9 — G. albipila (Zetterstedt); 10 — G. castanipes (Becker); 11 — G. cuneiventis (Zetterstedt); 12 — G. dorsata (Zetterstedt); 13 — G. hirta (Hendel). Рис. 8–13. Стерниты 4 (вниЗу) и 5 (вверху) самца Gimnomera: 8 — G. alanica (Ozerov); 9 — G. albipila (Zetterstedt); 10 — G. castanipes (Becker); 11 — G. cuneiventis (Zetterstedt); 12 — G. dorsata (Zetterstedt); 13 — G. hirta (Hendel).

Figs 24–32. Epandrium, cercal plate and surstyli of Gimnomera spp.: 24–26 — G. alanica (Ozerov); 27–29 — G. albipila (Zetterstedt); 30 –32 — G. castanipes (Becker); 24, 27, 30 — dorsolateral view; 25, 28, 31 — lateral view; 26, 29, 32 — dorsal view. Рис. 24–32. Эпандрий, церки и сурстили Gimnomera spp.: 24–26 — G. alanica (Ozerov); 27–29 — G. albipila (Zetterstedt); 30–32 — G. castanipes (Becker); 24, 27, 30 — дорсолатерально; 25, 28, 31 — сбоку; 26, 29, 32 — сверху.