Seq # 185120050

Caloptilia elongella (Linnaeus, 1761) Species

Last modified: May 26, 2021, 11:33 a.m.

A fairly common species throughout Belgium.


Family: Gracillariidae > Subfamily: Gracillariinae > Tribus: Gracillariini > Genus: Caloptilia > Species: Caloptilia elongella
Vernacular names
Bruine elzensteltmot (NL), Pale red slender (EN)
Caloptilia signipennella (Hübner, 1796)
First mention in Belgium
De Sélys-Longchamps E. 1844. Énumération des insectes Lépidoptères de la Belgique. — Mémoires de la Société royale des Sciences de Liége 2: 1–35. On page 25 (as signipennella). view page




Forewings more or less unicolourous ochreous to brown, a little darker brown in the apical area; sometimes with some scattered dark brown dots.

Museum specimens

Specimens in nature


Greyish green with brownish head capsule.

No pictures yet!


First instars make a short serpentine mine on the upperside of a leaf that later broadens into a whitish blotch. Later instars contract the mine into an elongated tube. The free living instars roll a leaf margin downwards and fasten it with white silk.
See also and


A transparant, yellow-shining cocoon.

No pictures yet!


Mines with caterpillars can be found from March till October, without a clear seasonal maximum. Pupation in a transparant, yellow-shining cocoon, most of the time at the underside of a leaf and at the leaf margin. The species hibernates in the adult stage. Moths take shelter in cracks of trees, with a preference for pine trees. They hide during daytime but come to light.

No pictures yet!

Flight periods

The adults fly in two generations a year: in June, and again from late August till April of the next year.

Observed on

Host plant (species):
Alnus glutinosa

The larvae feed mainly on Alnus glutinosa, more rarely on Alnus incana.

No pictures yet!