Acari: Paleontology

Almost 300 species of acariform mites are known as fossils, although this number does include several subfossil oribatid mites belonging to living species. The oldest acariform mites are Devonian, but many groups only make their first appearance in Mesozoic ambers. Oribatids are quite well represented throughout the fossil record thanks to their often heavily sclerotized body; but fossils of many groups with soft, tiny bodies or highly specialised ecologies have never been discovered. Only a handful of parasitiform mites are known as fossils, the oldest of which are some ticks from Cretaceous ambers.