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.
Evolution of dinosaurs
With the exception of "Argentinosaurus" (included to fill a gap in time), these graphs show only the length of sauropods for whom near-complete fossil skeletons are known. It doesn't show other very large sauropods (see Dinosaur size#Sauropods) because these are only known from very incomplete skeletons. The ratio of skull length to body length is much higher in "Eoraptor" than in sauropods. The longest skull graphed is of "Nemegtosaurus", which is not thought be a particularly large sauropod. The skull of "Nemegtosaurus" was found near the headless skeleton of 11 metre (36 ft) long "Opisthocoelicaudia", and it has been suggested that they may be the same species, but see Nemegtosauridae.