Lourinhasaurus ("Lourinhã lizard") is a genus of sauropod from the Late Jurassic of Portugal. It was originally believed to be a Portuguese species of Apatosaurus, but was later determined to be its own species. It is a close relative of the North American sauropod Camarasaurus.
In The Land Before Time
Several Lourinhasaurus appear as background characters in The Land Before Time X: The Great Longneck Migration. They are part of the massive group of Longnecks that journey to the crater to "prevent the Bright Circle from falling out of the sky." Eventually, they all leave the crater and return to where they came from.