For every sauropod tooth found, about 30 predatory dinosaur (theropod) teeth are found. In our study, we compared all known occurrences of sauropod teeth and found three different types. But there are instances where there are only teeth – a mysterious clue to an unknown type of sauropod. An earlier study I conducted together with sauropod expert Dr Verónica Díez Díaz found similarities between North African and Southern European sauropod tooth types. Some sauropod teeth from North Africa even resemble findings from South America, showing evidence for a common ancestor between the sauropods of these two continents.

Source: The North Africa Journal February 11, 2020 12:45 UTC