"an ichthyosaurus"
Illustration of Ichthyosaurus
Public DomainIllustration of Ichthyosaurus - Credit: Heinrich Harder

An ichthyosaurus (from the Greek ichthys meaningĀ fish and sauros meaning lizard) was a prehistoric marine reptile belonging to the ichthyosaur family.

Similar in appearance to the dolphin or bluefin tuna, the ichthyosaurus inhabited what is now central Europe during the Early Jurassic period.