Sponge flies, also known as spongilla-flies (Neuroptera, Sisyridae), are specialist predators of freshwater sponges.
Cervera also found many new insects, especially of the order Neuroptera.
He was Kustos or curator of Hymenoptera (and Neuropterida) at Museum für Naturkunde (Berlin) from 1921 until 1955.
The Cretaceous Mesohemerobius was formerly considered a brown lacewing, but is today rather placed as incertae sedis in the Neuroptera; it might be a member of the Hemerobioidea but not even that is certain.