What traits do scientists use to classify neuropteran families?

To classify families within the group commonly referred to as neuropterans—which includes the orders Neuroptera, Megaloptera, and Raphidiodea—scientists examine a variety of morphological traits in both the adult and larval stages.12

Adult Characteristics

At the adult level, the primary criteria used to distinguish families include:
* Head and Thorax: The overall shape of the head and thorax, including whether the mouthparts are prognathous (directed forward) or hypognathous (directed downward).13
* Sensory and Mouthparts: The presence or absence of simple eyes (ocelli) and the specific morphology of the antennae and mouthparts.1
* Wings: The shape and venation patterns of the wings are critical diagnostic features.1
* Body and Legs: The general structure of the body and the morphology of the legs.1

Larval Characteristics

Larval traits are particularly useful for separating these groups, especially when distinguishing between aquatic and terrestrial habits. Key features include:1
* Mouthparts: The structure of the jaws, such as the biting mandibles found in Megaloptera and Raphidiodea versus the specialized piercing-sucking jaws (combined mandibles and maxillae) characteristic of Neuroptera.13
* Body Morphology: The presence or absence of abdominal filaments, prolegs, and the overall form of the head, neck, and body.1