The silverfish are fast moving, but primitive insects that have scale covered or bare bodies, and no wings. They may or may not have compound eyes, and when they are present they are simple. Many have long filaments (cerci) at the end of their abdomen. Some silverfish only eat plant material but most are omnivorous.
References:
Naumann, I. D & Naumann, I. D & CSIRO. Division of Entomology 1991, The Insects of Australia : a textbook for students and research workers, 2nd ed, Melbourne University Press, Carlton South, Vic