Sauroposeidon
The press release in 1999 immediately garnered international media attention, which led to many (inaccurate) news reports of "the largest dinosaur ever!". While "Sauroposeidon" likely represents the tallest known dinosaur taxon, it does not hold records for either the longest or most massive. "Patagotitan" or "Argentinosaurus" make better candidates for the title "World's Largest Dinosaur" (presuming to ignore, as is conventional, "Amphicoelias"), though incomplete fossil evidence makes exact rankings impossible.
Spinosauridae
Spinosauridae (meaning "spined lizards") is a family of megalosauroidean theropod dinosaurs. The genus "Spinosaurus", from which the family, subfamily, and tribe borrow their names, is the largest terrestrial predator known from the fossil record, and likely reached lengths of 15 m (49 ft) or more. Most spinosaurids lived during the Cretaceous Period, with possible origins in the Late Jurassic, and fossils of them have been recovered worldwide, including in Africa, Europe, South America, Asia, and Australia, although none have been formally named from the latter continent.