Heterarthrus wuestneii (Konow, 1805)
Acer campestre, Groeningen
larva (in the prepupa stage, colourless!) in the process of cutting its cocoon free
Acer campestre, Belgium, prov. Antwerp, Mol © Carina Van Steenwinkel
mine with cocoon
Acer campestre, Denmark © Simon Haarder
prepupa in the mine
Acer campestre, Hungary, Mosonmagyaróvár © László Érsek, mine
prepupa taken out of the cocoon
A large, upper-surface (often nearly full depth) blotch, without a hint of a preceding corridor, beginning in the tip of a leaf segment. Often a well-defined first section of the mine is much shallower, green when lighted from behind. Frass in loose grains. Like in H. aceris the cocoon, that is formed in the mine, drops out of the leaf along with a circular section of the upper epidermis. Like in all Heterarthrus species the larva has thoracic feet that are reduced to triangular stumps.
Sapindaceae, narrowly monophagous
Tomov & Krusteva (2007a) also mention Acer platanoides; this must be mistake.
Larvae observed in early June.
BE Paul Fontaine found material that could be identified with certainty in Belgium in 2005 (Rochefort, prov. Namur); the year before I had found mines in Belvaux (Ardennes), but this material dated from mid July and consisted of vacated mines.
NE Found in 2005 in the Netherlands (Bergen/Limburg and Venray).
LUX niet waargenomen (Fauna Europaea, 2008).
distribution within Europe
From Denmark to Switzerland, and from Britain to the Ukraine (Fauna Europaea, 2008).
Heterarthrus healyi Altenhofer & Zombori, 1987 (see Dathe, Taeger & Blank, 2001a); an earlier statement by Liston (1995a) that contrariwise H. cuneifrons were a synonym of wuestneii has been rejected.
Altenhofer (2003a), Altenhofer & Zombori (1987a), Blank ao (1998a), Braggion (2013a), Dathe, Taeger & Blank (2001a), Liston (1995b), Liston & Späth (2005a), Pschorn-Walcher & Altenhofer (2000a), Robbins (1991a), Späth & Liston (1995a, 2003a, 2007b), Taeger, Blank & Liston (2006a), Taeger ao (1998a), Tomov & Krusteva (2007a).