Fenusa dohrnii (Tischbein, 1846)
european alder leafminer
Alnus glutinosa, Aalten
Alnus glutinosa, Orvelte: young mines with oviposition scars
A large brownish blotch, without an initial corridor. Usually the mine starts near a vein exil, and expands towards the leaf margin. Th mine mostly remains enclosed by two thick lateral veins; only near the leaf margin (and especially in thin shadow leaves) the mine may trespass over the side veins. Often several mines in a leaf. The mine is upper surface, but quite deep. Especially when the larva is young not all tissue is eaten away, and the mine keeps a greenish tinge there. Contrary to Heterarthrus vagans, at least as common on the same host, the larva vacates the mine prior to pupation.
Alnus cordata, glutinosa, incana & subsp. rugosa, viridis & subsp. suaveolens.
According to van Frankenhuyzen (1970a) and Hart ao (1991a) there are three generations, with larvae in May-June, July, and August-September, but mines with young larvae may be found as late as November.
BE recorded (Fauna Europaea, 2008).
NE recorded (van Ooststroom, 1976a).
LUX recorded (Chevin, Ellis & Schneider, 2011a).
distribution within Europe
Entire Europe, with possible exception of the Balkan Peninsula (Fauna Europaea, 2008).
The egg is deposited below the upper epidermis, where a low bulge develops as an oviposition scar. Contray to Heterarthus vagans the scar doesn’t turn brown but keeps its green colour (van Frankenhuyzen & Freriks, 1970c).
Out of 800 specimens just one turned out to be a male; the species must, at least locally, be parthenogenetic (Altenhofer, 1980b).
Ahr (1966a), Altenhofer (1980b, 2003a), Beiger (1979a), Beneš & Holuša (2015a), Blank ao (1998a), Buhr (1933a, 1941a, 1964a), Chevin, Ellis & Schneider (2011a), Drăghia (1968a, 1972a), van Frankenhuyzen (1970a), van Frankenhuyzen & Freriks (1970c), van Frankenhuyzen & Houtman (1972a), van Frankenhuyzen Houtman & Kabos (1982a), Haase (1942a), Haris (2009a), Hart ao (1991a), Hartig (1939a), Hering (1932a, 1957a), Huber (1969a), Kirichenko, Augustin & Kenis (2018a), Kvičala (1938a), Liston (1995b, 2006a), Liston & Späth (2005a), Lorenz & Kraus (1957a), Maček (1999a), Matošević, Pernek, Dubravac & Barić (2009a), Nowakowski (1954a), van Ooststroom (1976a), Pieronek (1962a, 1973a), Pschorn-Walcher & Altenhofer (2000a), Robbins (1991a), Savina & Chevin (2012a), Scobiola-Palade (1974a), Skala & Zavřel (1945a), Smith (1971a), Sønderup (1949a), Stammer (2016a), Taeger, Blank & Liston (2006a), Taeger ao (1998a), Viramo (1969a), Wahlgren (1944a, 1951a, 1963a), Zoerner (1969a, 1970a).