Allantinae Blennocampinae Heterarthrinae Nematinae Selandriinae - (includes Dolerinae) Susaninae Tenthredininae Tenthredinidae is the largest family of sawflies, with well over 7,500 species worldwide,[2] divided into 430 genera.

Larvae are herbivores and typically feed on the foliage of trees and shrubs, with occasional exceptions that are leaf miners, stem borers, or gall makers.

The Tenthredinidae are also often somewhat dorsoventrally flattened, which will distinguish them at least from the slender cephids (which, together with the common sawflies, comprise many of the Nearctic species of Symphyta).

Females use their saw-like ovipositors to cut slits through barks of twigs, into which translucent eggs are wedged, which damages the trees.

A number of species and genera have been described from the fossil record such as Eriocampa tulameenensis and Pseudosiobla campbelli of British Columbia.