Greenomyia stackelbergi Zaitzev, 1982

Kurina, Olavi, Hedmark, Kjell, Karstroem, Mats & Kjaerandsen, Jostein, 2011, Review of the European Greenomyia Brunetti (Diptera, Mycetophilidae) with new descriptions of females, ZooKeys 77, pp. 31-50 : 42-44

Greenomyia stackelbergi Zaitzev, 1982 Figures 481216202428

Type material studied:

Holotype ♂, RUSSIA. Primorskiy Terr., Santaheza, 07.VII.1927 (A. Stackelberg leg.) [ZIN, on pin].

Other material studied: SWEDEN. 4 ♀♀, Lu. Jokkmokk, Vuollerim, in garden, 105 m.a.s.l., Malaise trap, 11.VIII.-19.IX.2003 (K. Hedmark and M. Karström leg.); 1♂, the same locality, Malaise trap 11.-19.VIII.2004; 25♂♂ 15♀♀, the same locality, Malaise trap 11.VIII.-7.X.2005; 11♂♂ 4♀♀, the same locality, Malaise trap 11.VIII.-22.IX.2006; 18♂♂ 14♀♀, the same locality, yellow pan-trap VII– 08.X.2006; 17♂♂ 7♀♀, the same locality, yellow pan-trap 16.VI.-20.VII.2007; 14♂♂ 4♀♀, the same locality, Malaise trap 12.VIII.-28.IX.2007; 9♂♂ 3♀♀, the same locality, window trap VI– 11.IX.2007; 4♂♂ 1♀, the same locality, Malaise trap 13.-27.VI.2008; 1♀, the same locality, yellow pan-trap 19.VI.2008; 1♂, the same locality, window trap 1.VI.-1.VII.2008. In total 153 specimens: 100♂♂ 53♀♀, [most in Coll. Hedmark, some in IZBE and MZLU, most of the material preserved in alcohol, while some specimens are mounted from alcohol to pins or slide mounted].

Diagnostic characters.

Female.Thorax bi-coloured; mesonotum yellow with variably developed black thoracic stripes; pronotum and propleuron yellow, other pleural parts brown to blackish. Abdominal sternites I-IV entirely yellow or slightly brownish; tergites of first four segments bi-coloured: basally yellow, apically brown (in a few occasions first four tergites entirely brown). Legs all yellow except dark brown band on apical fourth of hind femur. Tibiae densely covered with brown setulae. Scape, pedicel, and 3-5 flagellomeres yellow, rest of flagellum light brown. Mouthparts yellow. Apical palpal segment 4.1-4.4 (n=5) times as long as penultimate segment. Wing hyaline with slight yellowish tinge, all veins reach wing margin, M1 and CuA2 basally obsolete or very weak. Terminalia brown, cercus one-segmented, apically yellow. Gonapophysis IX membranous, subsquare with shallow incision apically, not visible in lateral view. Tergite VIII wider than tergite IX. Sternite VIII medially with deep and narrow incision, lateral incisions more shallow.

Male. Coloration and other non-terminal characters similar to female. The apical palpal segment is 4-5 (n=5) times as long as penultimate segment.

Remarks.

Besides its peculiar distribution (see Fig. 29), Greenomyia stackelbergi is unique among the four studied species in having vivid yellowish colouration and hyaline wings. It was described from South Primorje in the Russian Far East ( Zaitzev 1982) and has subsequently been recorded only from two semi-urban localities in the Nordic region: the single locality in Swedish Lapland (present material, Kjærandsen et al. 2007) and from one locality in the capital of Norway, Oslo ( Søli and Kjærandsen 2008). Eight years of collecting (2002-2009) with Malaise traps, yellow pan-traps and window traps near a compost in the garden of one of the authors (MK) yielded 153 specimens, indicating rise and decline of a small population. None was collected in the first and the last year, while four in 2003, one in 2004, 40 in 2005, 47 in 2006, 54 in 2007 and seven in 2008. The flight activity lasted almost the whole vegetation season, from the middle of June (in 2007) to the beginning of October (in 2004). A garden compost is the supposed microhabitat for this population of Greenomyia stackelbergi and its origin should be somewhere in the surroundings. A close potential natural habitat could be the Vuollerim ravine a few hundred meters away. Waste from picked forest fungi might be another possibility.