A silverfish (Lepisma saccharina) is a small, wingless insect in the order Thysanura. Its common name derives from the animal’s silvery light grey and blue color, combined with the fish-like appearance of its movements, while the scientific name (L. saccharina) indicates the silverfish’s diet consists of carbohydrates such as sugar or starches.
Silverfish are nocturnal insects typically 13–25 mm (0.51–0.98 in) long. Their abdomens taper at the end, giving them a fish-like appearance. The newly hatched are whitish, but develop a greyish hue and metallic shine as they get older. They have two long cerci and one terminal filament at the tips of their abdomens, the filament projects directly off of the end of their body, between the left and right cerci. They also have two small compound eyes, despite other members of Thysanura being completely eyeless, such as the family Nicoletiidae.
Silverfish. In Wikipedia. Retrieved August 30, 2016, from https://en.wikipedia.org/wiki/Silverfish