Cetiosauridae A clade in the dinosaur family tree. The entries below are classified within it. Protognathus 353.7–346.7 Mya Patagosaurus fariasi 182.9–168.6 Mya Protognathosaurus oxyodon 168.2–161.5 Mya · China Chebsaurus algeriensis 165–163 Mya · Algeria