Anomalocaris
Anomalocaris lived in the Cambrian period, which was a long time before dinosaurs. This makes Anomalocaris very old, so their body parts haven't evolved to be as detailed as modern animals. However, Anomalocaris still had compound eyes which were very big and complex compared to other animals in the earlier parts of the Cambrian, and also had segmented (has many sections) front appendages which were used to grasp its prey like arms. So while Anomalocaris was around the size of a small cat, it still was a very good predator.