Latreille to the primitive wingless insects known as springtails and bristletails.
Lubbock (Lord Avebury) separated the springtails as a distinct order, the Collembola, and by many students this separation has been maintained.
This order includes the bristle-tails and the springtails.
But the bristle-tails and springtails, which form the modern order Aptera, are all without any trace of wings, and, on account of several remarkable archaic characters which they exhibit, there is reason for believing that they are primitively wingless - that they represent an early offshoot which sprang from the ancestral stock of the Hexapoda before organs of flight had been acquired by the class.
- The Aptera are divided into two divergent sub-orders, theThysanura or bristle-tails, and the Collembola or springtails.