7 to 12 mm long.
Wingless insects. Fusiform (spindle-shaped) body, wider at the front and getting narrower toward the rear end.
Antennae are the same length as the body.
Abdomen ending in 3 cerci half the body-length and of unequal length, the middle one being the longest.
Scales covering the whole body, giving them their characteristic silvery colour; the scales can sometimes peel off to enable the insects to free themselves from a spider’s web or from a predator’s grasp.
Entirely silvery metallic grey.