Thalassomedon was a giant ancient sea tortoise. It lived during the Ordovician times around 100 million years ago. Thalassomedon mainly ate fish and weighed 4,000 kg. They were 11 metres long and 8.53 metres tall. They had grey-brown thick scaly skin. Hand-painted dinosaur toy. Designed by experts, CollectA dinosaur models are factually accurate and true to life.