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Nymphidae, sometimes called split-footed lacewings, are a family of winged insects of the order Neuroptera.

Nymphidae stand somewhat apart from other living Myrmeleontoidea. The antlions ( Myrmeleontidae) and the owlflies ( Ascalaphidae) are more closely related to them, but the bulk of the Nymphidae sister groups include extinct taxa known only from fossils, such as the Nymphitidae, Brogniartiellidae or Babinskaiidae. The spoonwings ( Nemopteridae) were at one time also believed to be quite closely related, but they seem to belong to another lineage of Myrmeleontiformia altogether. Myiodactylus osmyloides and its relatives were formerly separated as Myiodactylidae but they do not form a lineage separate from the other Nymphidae.

In addition to the numerous living genera, the fossil Pronymphes is known from the Eocene plus Araripenymphes and Rafaelnymphes from the Cretaceous Crato Formation in Brazil.