Tetragoneura ambigua Grzegorzek 1885

• Main Authors: Polevoi, Alexei, Jakovlev, Jevgeni
• Format: Other/Unknown Material
• Language: unknown
• Published: 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Mycetophilidae; Tetragoneura; Tetragoneura ambigua; Kon; Syväjärvi; karelia*
• Online Access: https://zenodo.org/record/6187672; https://doi.org/10.5281/zenodo.6187672

2. Tetragoneura ambigua Grzegorzek, 1885 (Figs. 1: A–C; 3: A, B) Parastemma ambigua Grzegorzek, 1885: 199? = Sciophila dissimilis Zetterstedt 1852: 4137 Material examined. FINLAND: 1 3, Kb: Ilomantsi, Koitajoki, 20.9.– 01.10.1996 (FRIP, Tietäväinen leg.); 3 Ƥ, same place, 02.9.–08.9.1998 (FRIP, Tietäväinen leg.); 1 3, Kb: Ilomantsi, Syväjärvi, 14.6.– 17.6.1996 (FRIP, Tietäväinen leg.); 1 3, Ta: Lammi, Kotinen strict nature reserve (METLA, J.Jakovlev leg.) 15.9.– 03.10.2003; 1 3, same place (METLA, J.Jakovlev leg.) 28.8.– 04.10.2004; 1 3, Ta: Lammi, Evo, Leipäsuonaho (METLA, J.Jakovlev leg.) 01.9.– 10.9.2003; 1 3, St: Ikaalinen, Seitseminen National Park (METLA, J.Jakovlev leg.) 29.7. 2008. RUSSIA, KARELIA: 1 3, Kon: Kivach, 0 3.9. 2002, (FRIP, Polevoi leg.); 1 3, Kb: Tolvojarvi, 29.8.– 11.9.1998; 1 3, 1 Ƥ, same place, 26.8 –07.9.1999, (FRIP, Tietäväinen leg.). Description. Male (n= 5) Head dark-brown to black, thinly grey dusted, with numerous hairs and several long black setae. Lateral ocellus separated from eye margin by the distance of 1.4–2.1 times its own diameter. Palpus yellow. Clypeus darkbrown, densely covered with short hairs. Antennae brown, pedicel yellow. Fifth flagellomere 1.4–1.7 times as long as wide. Scape and pedicel with long black setae apically. Eyes densely covered with minute hairs. Thorax. Scutum and scutellum dark-brown to black black with gray polinosity. Scutum with short biserial ac, biserial dc and some long black setae by lateral margin. Pleurae dark-brown, thinly grey dusted. Antepronotum and proepisternum haired and with black bristles, the rest of the pleurae bare. Wing length 2.64–3.13 [mean value 2.86] mm. Wing hyaline, veins yellow, costa and radius brownish. C extending slightly beyond the middle of the distance between R 5 and M 1. Sc short, ending free. R 4 absent. R 1 about as long as ta. Stem of M-fork 1.3–1.4 times as long as ta. Base of CuA-fork lies under the middle of ta. Macrotrichia well developed on all veins with exception of Sc and proximal part of M. Haltere ...