Orthonevra nobilis (Fallen, 1817).
Fallen, C.F. 1816-1817. Syrphici Sveciae. Pp. 1-14 [1816.06.08], 15-22 [1816.06.08], 23-30 [1817.05.10], 31-42 [1817.05.20], 43-54 [1817.05.21], 55-62. [1817.05.22] Berlingianis, Lundae [= Lund].
Flowers visited by adults: white umbellifers; Fragaria, Galium, Potentilla erecta, Ranunculus (Speight 2010).
The flight period for European specimens of O. nobilis is from May to August, plus April in southern Europe (Speight 2010).
Orthonevra nobilis ranges from central Norway south to Pyrenees and central Spain; from Ireland eastwards through northern and central Europe into European parts of Russia; also in mountainous parts of Italy, the former Yugoslavia, Greece and Turkey; the Caucasus; through Siberia to the far east; and China (Speight 2010).
Adults fly among ground vegetation, usually close to water (Speight 2010).
Preferred environment: freshwater/wetland/forest; springs and flushes in fen, raised bog, riparian gallery forest and humid Fagus. May on occasion also occur in association with springs in humid grassland (Speight 2010).
Larva of O. nobilis was described and figured by Maibach and Goeldlin (1994; in French), associated with springs and flushes, where it occurs in wet, organically-enriched mud.
unless otherwise stated