Pamphiliidae

Pamphiliidae is a small family within Symphyta, containing some 200 species from the temperate regions of North America and Eurasia. The larvae feed on plants, using silk to build webs or tents, or to roll leaves into tubes in which they feed, thus earning them the common names leaf-rolling sawflies or web-spinning sawflies. Some species are gregarious and the larvae live in large groups. Fossils of Pamphiliidae have been dated to the Jurassic period.
They are distinguished from the closely related Megalodontesidae by their simple, filiform antennae.

Taxonomy

The family is currently divided into three subfamilies based on phylogenetic analysis of both extant and extinct species.