A likely ancestor for all plesiosaurs although it is known only by its skull. It bears some similarities to both nothosaurs and plesiosaurs, and is found in rocks of Middle Triassic age.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。