Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pinacosaurus ( plank lizard ) is a genus of medium-sized dinosaurs that lived from the late Santonian to the late Campanian of the late Cretaceous Period (roughly 80-75 million years ago), in Mongolia and . Pinacosaurus had between two and five additional holes near each nostril, which have not been explained.Pinacosaurus was a lightly built, medium-sized ankylosaur that reached a length of 5 (16 ) Like all ankylosaurids, it had a at the end of its tail which it used as a defensive weapon against predators such as Velociraptor. The most unusual element in the original specimen is the presence of two additional egg-shaped holes, one on top of the other, where the nostrils are normally found. The openings are characteristic of the genus, and the number varies: Godefroit et al. described four in 1999, and in 2003 a juvenile specimen with of five pairs of openings was described.

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