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Thanks Theo!
I have an upper view too. It would help?
Species recorded from Iberian Peninsula are:
Billaea adelpha, B. biserialis, B. irrorata, B. lata, B. maritima, B. marmorata, B. pectinata.

Are some of them out of rule? Are some of them more common? Maybe some of them are not found in Saragossa region, or not in the habitat mentioned, or doesn't fly in this time of year?