Caloptilia semifascia (Haworth, 1828)
Acer campestre, Britain © Rob Edmunds
The mine begins as an inconspicuous, short, lower-surface epidermal gallery. This widens into a small triangular blotch, usually in a vein axil. The mine in this stage is rather transparent. Older larvae live free in a leaf cone, made by folding down a leaf segment. In the course of its free life the larva makes three cones, of increasing size, either on the same leaf or not. Pupation in a flat, parchement-like, shining, yellowish white cocoon on either side of the leaf, generally near the margin (Emmet ao, 1985a).
Sapindaceae, narrowly monophagous
Rarely transgressing to Acer pseudoplatanus (Emmet ao, 1985a).
Larvae in two generations, May-June and June-July (Emmet ea, 1985a, Langmaid ea, 2011a)
BE recorded (de Prins & Spronck).
NE recorded (Huisman & Muus).
LUX not recorded (Fauna Europaea, 2011).
distribution within Europe
From Fennoscandia to the Pyrenees, Italy, and Bulgaria, and from Britain to South Russia.
Pale green, head capsule light brown.
Caloptilia onustella (Hübner, 1813) (cf De Prins & De Prins, Global Taxonomic Database of Gracillariidae (Lepidoptera), 2011); Caloptilia hauderi of British authors (cf Langmaid ao, 2011a).
Mines mainly in the higher parts of the crown (2-4) of trees growing in forests; not in hedgerows (Emmet ao, 1985a).
Ahr (1966a), Bengtsson & Johansson (2011a), Biesenbaum (2010a), Bengtsson (2011b), Brown (1947a), Buszko (1992b), Corver, Muus & Ellis (2011a), Emmet, Watkinson & Wilson (1985a), Hering (1924b, 1934b, 1957a), Huemer (2012a), Huemer & Erlebach (2003a), Huisman & Muus (2020a), Kasy (1983a, 1987a), Klimesch (1950c), Langmaid, Sattler & Lopez-Vaamonde (2011a), Maček (1999a), Opheim (1977a), De Prins (2010b, 2011a), De Prins & Spronck, 2004a, Robbins (1991a), Sefrová (2005a), Skala & Zavřel (1945a), Sønderup (1949a), Stolnicu (2007a), Szőcs (1977a), Vávra (2016a).