The Thysanoptera are probably world-wide in their range, but they have hardly been studied outside Europe and North America.
The usual variations in habit that characterize plant-feeding insects are exhibited by the Thysanoptera some species being found only on one particular food-plant, while others thrive indifferently on a large assortment.
In two of the three families of Thysanoptera the female has a conspicuous ovipositor (fig.
Some Thysanoptera habitually dwell on the under-surface of leaves, and others periodically migrate to roots.
Uzel's Monographie der Ordnung Thysanoptera (Koniggratz, 1895; in the Czech language.
Only about 150 species of Thysanoptera are known; the European species with a few exotic forms have been described by Uzel, the North American by Hinds.
Many species of Thysanoptera are known to be habitually parthenogenetic. The eggs are laid on the food-plant, those females possessed of an ovipositor cutting through the epidermis and placing their eggs singly within the plant-tissues; a single female may take five or six weeks to deposit all her eggs.
In their life-history the Thysanoptera belong to the Exopterygote division of the Hexapoda (q.v.).
The term Thysanoptera was first used by the Irish entomologist A.
This order can be traced with certainty back to the early Jurassic epoch, while the Permian fossil Eugereon, and the living order - specially modified in many respects - of the Thysanoptera indicate steps by which the aberrant suctorial and piercing mouth of the Hemiptera may have been developed from the biting mouth of primitive Isopteroids, by the elongation of some parts and the suppression of others.