Etainia louisella (Sircom, 1849)
maple-seed pigmy

Acer campestre, Belgium, prov. Liège, Liège, canal de l’Ourthe © Jean-Yves Baugnée

Acer campestre, België, prov. Namur, Vierves-sur-Viroin © Stéphane Claerebout: larva, ventral view
mine
Oviposition on the wing of a key (“samara”). The larva makes a short superficial corridor (sometime only the egg is visible) running towards the seed. Finally the seed is eaten out. Attacked fruits remain on the plant (Johansson ao, 1990a).
host plants
Sapindaceae, monophagous
Acer campestre, tataricum.
phenology
Mining larvae in June-Junly (Alders, 2004a); Emmet (1983a) speculates that in the UK sometimes two summer generation occur.
BENELUX
BE after 2004 recorded in all provinces (Phegea, 2004).
NE recorded (Alders, 2004a).
LUX not recorded (Fauna Europaea, 2007).
distribution within Europe
From the UK to the Ukraine, and from Denmark to Italy (Fauna Europaea, 2007).
pupa
In a brownish cocoon, often on the stem.
synonyms
Ectoedemia louisella; Stigmella, Etainia, Obrussa, sphendamni (Hering, 1927).
notes
The larvae that hatch in autumn consume a number of buds for the next year from the inside out. Only the next spring this non-mining hibernating generations pupates (Emmet, 1984a).
references
Alders (2004a), Bengtsson (2008a), Borkowski (1969a), Černý (2001a), Emmet (1983a), Hering (1957a), Huisman, Koster, van Nieukerken & Ellis (2009a), Huisman, Koster, van Nieukerken & Ulenberg (2005a), Jäckh (1951a), Johansson ao (1990a), Kasy (1983a), Kuchlein & Donner (1993a), Kuchlein & de Vos (1999a), Kurz (2016a), Laštůvka & Laštůvka (1997a, 2015a), Maček (1999a), Navickaitė, Diškus & Stonis (2014), van Nieukerken (1986a), van Nieukerken, Laštůvka & Laštůvka (2006a), Robbins (1991a), Sefrová (2005a), Skala (1939a), Skala & Zavřel (1945a), Sønderup (1949a), Stonis, Navickaitė, Rocienė ao (2013a), Szőcs (1977a, 1978a, 1981a), Vos (2017a), Wieser (2004a).