Genus Nothosaurus is a term used to describe a group of extinct marine reptiles that lived during the Triassic period. While there are no direct synonyms for this scientific name, there are related terms that can help to provide additional context. For example, the group is often classified as part of the sauropterygia order, which includes other marine reptiles like plesiosaurs and placodonts. Within the Nothosaurus genus itself, there are several species, including Nothosaurus giganteus and Nothosaurus marchicus. Understanding the relationships and distinctions between these various terms can help researchers to better understand the evolution and behavior of these fascinating prehistoric creatures.