What are Ichthyosaurs? Ichthyosaurs were marine reptiles that flourished in the Mesozoic Era. These creatures showcased a remarkable resemblance to modern dolphins due to convergent evolution. Originating around 250 million years ago, they evolved streamlined bodies and fin-like limbs, adapting exquisitely to aquatic life. Unlike their reptilian relatives, Ichthyosaurs were viviparous, giving birth to live…