Gimnomera tibialis ( Malloch, 1919 )

Ozerov, A. L., 2019, A review of the genus Gimnomera Rondani, 1866 (Diptera: Scathophagidae) of Russia, Russian Entomological Journal 28 (2), pp. 195-218 : 212-213

Gimnomera tibialis ( Malloch, 1919)

Figs 22 , 66–68 .

tibialis Malloch, 1919: 79 ( Dasypleuron ). Type-locality: Collinson point, Alaska ( USA).

sibiricum Engelmark, 1999: 164 ( Cochliarium ). Type-locality: Wrangel Island (70º58’N, 179°34’E) ( Russia) — syn.n.

The species was recorded for Russia as Cochliarium sibiricum Engelmark, 1999 from Wrangel Island [ Engelmark, 1999].

MATERIAL. Chukotka: Meynypil’gyno env. (62.567ºN 177.033ºE), 23–27. VI.2011, P.C. Tomkovich (1 ♂, ZMUM) ; Vrangel Is., Somnitel’naya bay (ca. 70.9431ºN 179.6141ºW), 3, 9 and 10.VII.1972, Gorodkov (25 ♂♂, 20 ♀♀, ZISP) ; 55 km N of Egvekinot (66.7956ºN 181.00052ºE), 29.VII.1963, Gorodkov (2 ♂♂, ZISP) ; Shmidt (ca. 68.8703ºN 179.3744ºW), 11 and 18.VII.1963, Gorodkov (3 ♂♂, ZISP) ; S of Vrangel Is. (ca. 71.0294ºN 179.2694ºW), 11.VII.1972, Gorodkov (7 ♂♂, 2 ♀♀, ZISP) ; Pevek (69.7022ºN 170.2982ºE), 3.VII.1963, Gorodkov (1 ♀, ZISP) ; Komsomol’skiy (69.1309ºN 172.7358ºE), 7.VII.1963, Gorodkov (1 ♂, ZISP) ; Krasnoyarsk Krai: Agapa (ca. 71.412ºN 89.2689ºE), the River Pyasina , 15.VII.1967, Gorodkov (1 ♀, ZISP) .

ADDITIONAL MATERIAL. Holotype of Cochliarium sibiricum Engelmark, 1999 (♂, “ Russia : Wrangel Island (70°58’N, 179º34’E), site 17, 23–24.VII.1994, leg. S.A. Bengtson ” ( MZLU); is conspecific with Gimnomera tibialis ); Canada: “ Victoria Is., N.W. T., 71º17’N, 114ºW, 23–28.VII.1975, G. & M. Wood (1 ♂, 1 ♀, ZMUM); Herschel Is., Y. T., 11.VII.1953, J.S. Waterhouse (1 ♂, 1 ♀, ZMUM) .

DESCRIPTION. Male, female. Small or medium-sized flies (3.1–4.6 mm long).

Head. Frontal vitta usually reddish-yellow, sometimes black in upper half and yellow in lower part, matt; fronto-orbital plate black, whitish dusted. Ocellar triangle black. Face blackish, whitish dusted. Parafacial and gena yellow, whitish dusted. Postcranium black, greyish dusted. 2–3 orbitals, 2–3 frontals, 1 ocellar, 1 small postocellar, 1 inner vertical, 1 outer vertical; 1 pair of vibrissae present. Antenna black. Postpedicel approximately 1.5 times as long as wide. Arista black. Palpus brownish.

Thorax black, greyish dusted, only scutum with two shining wide interrupted stripes between dorsocentral and supra-alar setae. Acrostichals as hairs in two rows, dorsocentrals 2+(2–3), intra-alars (0–1)+(0–1), supra-alars 1+2, postpronotals 1–2 (usually 2), 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 black in ground colour, but usually fore tibia and sometimes mid and hind tibiae yellowish. Fore femur with a row of posterodorsal setae. Fore tibia with 0–1 dorsal/anterodorsal seta, 1 posterior and 1 preapical dorsal setae. Mid femur with 0–1 anterior seta at middle, 0–1 preapical posterodorsal and 1 preapical posterior setae. Mid tibia with 0–1 anterodorsal, 1 preapical dorsal setae and a ring of apical setae. Hind femur with a row of anterodorsal and a row of anteroventral setae and 0–1 preapical posterodorsal 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 greyish.

Abdomen black, subshining in male and shining in female. Male sternite 4 rectangular, about 3 times as wide as long, covered with long setae; sternite 5 narrow, with conical median lobes, covered with spinules and long setae ( Fig. 22 ). Epandrium, cercal plate and surstyli as in Figs 66–68 .

DISTRIBUTION. Russia: Chukotka, Krasnoyarsk Krai. — Nearctic [ Vockeroth, 1965].

Figures

Figs 20–23. Male sternites 4 (lower) and 5 (upper) of Gimnomera: 20 — G. palliseta sp.n.; 21 — G. tarsea (Fallén); 22 — G. tibialis (Malloch); 23 — G. ziegleri (Ozerov). Рис. 20–23. Стерниты 4 (вниЗу) и 5 (вверху) самцов Gimnomera: 20 — G. palliseta sp.n.; 21 — G. tarsea (Fallén); 22 — G. tibialis (Malloch); 23 — G. ziegleri (Ozerov).

Figs 60–68. Epandrium, cercal plate and surstyli of Gimnomera spp.: 60–62 — G. palliseta sp.n.; 63–65 — G. tarsea (Fallén); 66–68 — G. tibialis (Malloch); 60, 63, 66 — dorsolateral view; 61, 64, 67 — lateral view; 62, 65, 68 — dorsal view. Рис. 60–68. Эпандрий, церки и сурстили Gimnomera spp.: 60–62 — G. palliseta sp.n.; 63–65 — G. tarsea (Fallén); 66–68 — G. tibialis (Malloch); 60, 63, 66 — дорсолатерально; 61, 64, 67 — сбоку; 62, 65, 68 — сверху.