Seq # 250150010

Semioscopis avellanella (Hübner, 1793) Species

Last modified: Feb. 20, 2022, 5:08 p.m.

A rare and local species in Belgium, more frequently observed in the southern part of the country.


Family: Depressariidae > Subfamily: Depressariinae > Genus: Semioscopis > Species: Semioscopis avellanella
Vernacular names
Berkenplatlijf (NL)
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 23. view page




Forewing ground colour light greyish, a conspicuous black basal line connected to a short black line just before a reniform white patch, another short black line in the form of "V" just beyond the reniform patch.

Museum specimens

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Specimens in nature


Reddish orange, oval and flattened.

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Young larvae are white, head capsule black, prothoracic plate white. The full-grown larva is pale green with a darker green dorsal line, head capsule yellowish green, prothoracic plate green with some brown laterally.

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The eggs are oviposited in small groups of up to eight eggs on the twigs of the larval host plant.
The larva constructs a silken tube made by rolling a leaf-edge downwards. At night, it leaves this tube to chew holes in the nearby leaves. Larvae can be found from May till early September.
Pupation takes place within a cocoon amongst detritus on the ground.
This species hibernates in the pupal stage. Pupae can be found from September till early April.

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Flight periods

One generation a year: onwards from late February till April.

Observed on

Host plant (species):
Tilia cordata and Carpinus betulus
Host plant (genera):

The species prefers Betula spp. and Tilia cordata, but it has been found, though much less frequently, on Carpinus betulus.

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Mature Betula woodland, old forests with a lot of Tilia trees.

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