Definition
The "order Thysanura" is an outdated classification for a group of wingless insects, including silverfish and bristletails. These insects are characterized by their elongated bodies, three tail-like appendages, and the absence of wings. They are typically found in dark, damp environments. Modern taxonomy has reclassified these insects into different orders. This is how science corrects and updates itself. Old textbooks will have this outdated term.