Los neurópteros (Neuroptera, del griego neûron, "nervio" y ptéron "ala"; "alas con nervios") son un orden de insectos endopterigotos (con metamorfosis completa); los adultos tienen dos pares de alas membranosas con numerosas nervaduras que forman un retículo. Se trata de un grupo muy diversificado, con registro fósil desde el Pérmico. Se conocen unas 5.000 especies. Los neurópteros incluían antiguamente tres subórdenes, Megaloptera, Raphidioptera y Planipennia; actualmente, los dos primeros se tratan como órdenes independientes, mientras que Planipennia se considera sinónimo de Neuroptera.

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The insect order Neuroptera, or net-winged insects, includes the lacewings, mantidflies, antlions, and their relatives. The order contains about 6,000 species. The group was once known as Planipennia, and at that time also included alderflies, fishflies, dobsonflies, and snakeflies, but these are now generally considered to be separate orders (the Megaloptera and Raphidioptera). Sometimes the name Neuropterida is used to refer to these three orders as a group. This is either placed at superorder rank, with the Endopterygota becoming an unranked clade above it, or the Endopterygota are maintained as a superorder, with an unranked Neuropterida being a part of them. Within the endopterygotes, the closest living relatives of the neuropteridan clade are the beetles. The common name lacewings is often used for the most widely known net-winged insects – the green lacewings (Chrysopidae) – but actually most members of the Neuroptera are referred to as some sort of "lacewing". The adults of this order possess four membranous wings, with the forewings and hindwings about the same size, and with many veins. They have chewing mouthparts, and undergo complete metamorphosis. Neuropterans first appeared during the Permian Period, and continued to diversify through the Mesozoic Era. During this time, several unusually large forms evolved, especially in the extinct family Kalligrammatidae, often referred to as "the butterflies of the Jurassic" due to their large, patterned wings.

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