Diprionidae

The Diprionidae are a small family of conifer-feeding sawflies (thus the common name conifer sawflies, though other Symphyta also feed on conifers) restricted to the Northern Hemisphere, with some 140 species in 13 genera.

[1] These sawflies have the ability to compromise the health and ecological balance of forests.

When the temperatures begin to rise, the sawflies become strengthened pests to these conifers.

[2] The family has distinctive antennae with about 20 flagellomeres.

[3] These 13 genera belong to the family Diprionidae:

Gilpinia video
Sawfly infestation in Scots pines