plesiosaurodont
Plesiosaurodont is a term that has been used in paleontology to refer to a hypothetical or poorly understood group of marine reptiles, often with characteristics resembling plesiosaurs. However, it is not a formally recognized taxonomic group within the scientific classification of animals. The term may have arisen in earlier, less precise paleontological discussions to describe fossils that were difficult to categorize definitively, potentially showing a mix of features or being too fragmentary for detailed analysis.
The true nature and validity of any group referred to as "plesiosaurodont" are debated and depend heavily