What is "thysanura"

Thysanura \Thys`a*nu"ra\, n. pl. [NL., fr. Gr. ? fringe + ? tail.] (Zo["o]l.) An order of wingless hexapod insects which have setiform caudal appendages, either bent beneath the body to form a spring, or projecting as bristles. It comprises the Cinura, or bristletails, and the Collembola, or springtails. Called also Thysanoura. See Lepisma, and Podura.

Thysanura is the now deprecated name of an order of the class insecta. The current name is Zygentoma and encompasses the silverfish or fishmoths, and firebrats. Members of the order are best known for their three long caudal filaments.

The superfamily Machiloidea (families Machilidae and Meinertellidae), the jumping bristletails, were included in the Thysanura until the late twentieth century, but then were allocated to their own order Archaeognatha. The remaining members of the Thysanura comprised the suborder Zygentoma; the suborder was raised to full order status, thereby rendering the term "Thysanura" redundant, leaving Zygentoma as the applicable name. However, the momentum of nearly two centuries of nomenclature has preserved the name Thysanura in common use and in much published material.