Ichthyostega stensioei Psittacosaurus Its most striking aspect was

Its most striking aspect was its impressive head adorned with various thorns and horns

Tylosaurus proriger is an extinct species of mosasaur

outperforming most terrestrial predators

such as its flexible spine and vestigial legs

Ichthyostega stensioei Psittacosaurus Its most striking aspect wasIchthyostega stensioei is an extinct tetrapod species that lived during the Devonian period, approximately 360 million years ago. It is known for being one of the earliest terrestrial vertebrates, representing an important stage in the evolution of four legged animals from aquatic forms. The name "Ichthyostega" means "fish roof," referring to its evolutionary transition from fish to terrestrial forms, while "stensioei" honors paleontologist Erik