Abstract
Two new species of the bristle millipede family Polyxenidae, Pauropsxenus extraneus sp. nov. and Pauropsxenus extraneus sp. nov., are described from the mid-Cretaceous Burmese amber. They can be confidently placed in the extant genus Pauropsxenus (Polyxenidae) based on a set of critical characters. In additions, the morphological similarity of hooked caudal trichomes shared by the new species and extant counterparts may suggest a similar defensive function. Our discovery indicates that a prey-predator relationship between polyxenids and other soil animals has already been established in the Cretaceous period.
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