Common Ancestors

Dating back to the Upper Permian period approximately 250 mybp, the Lepidosaura represent an ancient group of fossil lizards. There are also fossil species of the Late Cretaceous period and Late Jurassic period that are related to living monitor lizards and snakes (Schwenk, 2000).

Identified in 2018, and being 240 million years old, the Megachirella wachtleri fossil is currently the oldest ancient ancestor of all modern squamates which include lizards, snakes and amphibians (Michael, 2018).

In this stem group the fossil of Paliguana whitei (Early Triassic) marks another common ancestor with the skull size and morphology indicating that it is part of the history of Lepidosauria.


© 2019 by Daniel Brown.