The term Suborder Plesiosauria refers to an extinct group of marine reptiles that lived during the Mesozoic Era. These long-necked creatures are often associated with the Loch Ness Monster and other legendary sea serpents. However, there are several other synonyms that can be used to describe these fascinating creatures, including Plesiosaurs, Elasmosaurs, and Cryptocleidus. Each of these terms highlights different aspects of their anatomy and behavior, such as the elongated neck of the Plesiosaur, the tightly packed teeth of the Elasmosaur, and the short neck of the Cryptocleidus. Despite their extinction over 66 million years ago, the legacy of these mysterious creatures continues to fascinate scientists and the public alike.