Most likely, the early Thysanoptera separated from other insects between the late Permian and the early Triassic. Whereas only a few finds associated with these order are known from the late Triassic and the Upper Jurassic (Triassothrips virginicus, Kazachothrips triassicus and Karataothrips jurassicus), fossil thrips are found more frequently in later Mesozoic strata, particularly in the Cretaceous. Some of them even can be allocated to extant families. Inclusions in Lebanese amber prove that thrips had already developed all their characteristic features 140 – 120 millions of years ago (Lower Cretaceous, Hauterivian).
Regular discoveries of amber inclusions of thrips are quite common, but most of these fossils date from much younger periods. A large number of species has been described from Eocene Baltic amber (40 millions of years old) and many of these species were included in more or less useful identification keys. Unfortunately, these works mostly lay emphasis on diagnostic descriptions only and lack information that allows conclusions to former ecological conditions.