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Hello Finaly & Xylo,

Phylogenetically these families are very close. Coelopidae, Dryomyzidae, Heterocheilidae and Helcomyzidae belong in Sciomyzoidea. Together with Sciomyzidae and Sepsidae. The sepsid Orygma luctuosum was even classified in Coelopidae because of its similarity.

Kind regards,
Ectemnius