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Thank you very much for your suggestion, Jürgen.
This species is cited in this magazine and I have confirmed that it is Blastobasis decolorella:
Corley, MFV, Maravalhas, E. y Passos de Carvalho, J. - Adiciones diversas a la fauna de Portugal (Insecta, Lepidoptera). en SHILAP Revista de Lepidopterologia 34 (136): 407-427. 2006
Greetings from Bilbao