 "Guizhouichthyosaurus" inhabited an ecological niche similar to modern-day humpback whales, their caudal fins being reduced and its head remaining small in comparison to its body.Near the end of the Triassic deadly marine biocalcification began to occur, along with oceanic acidification, sea-level fluctuations and the Central Atlantic Magmatic Province(CAMP) releasing carbon dioxide, sulfur dioxide and aerosols.These environmental catastrophes caused the extinction of the conodonts and 34% of other marine genera to disappear.