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.
Dinosaur
The smallest dinosaur known is the bee hummingbird, with a length of only and mass of around . The smallest known non-avialan dinosaurs were about the size of pigeons and were those theropods most closely related to birds. For example, "Anchiornis huxleyi" is currently the smallest non-avialan dinosaur described from an adult specimen, with an estimated weight of 110 grams and a total skeletal length of . The smallest herbivorous non-avialan dinosaurs included "Microceratus" and "Wannanosaurus", at about long each.