Explain the meaning of this English professional term. Thank you Thalattoarchon saurophagis

Thalattoarchin sauropod is a prehistoric sea monster, and the fossils of Thalattoarchin sauropod were found in Triassic rocks 244 million years ago. This creature appeared 4 million years after the first appearance of marine reptiles in the fossil record, and disappeared 8 million years after the Permian-Triassic extinction, when 90% of marine life was wiped out.

Thalattoarchon saurophagis's modern close relatives are killer whales and great white sharks, and their prey is similar in size. This creature appeared 8 million years after the biggest extinction event on earth-the Permian extinction, which led to the extinction of 95% species in the ocean. This sea monster lived for 65.438+0.6 billion years. At the end of Cretaceous, the number of species continued to decline, so did the biodiversity, and finally disappeared.