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.
Dromaeosauridae
Dromaeosaurids were small to medium-sized dinosaurs, ranging from about in length (in the case of "Mahakala") to approaching or over (in "Utahraptor", "Dakotaraptor" and "Achillobator"). Some may have grown larger; undescribed specimens of "Utahraptor" in Brigham Young University collections belonged to individuals that may have reached up to long, though these await more detailed study. Large size appears to have evolved at least twice among dromaeosaurids; once among the dromaeosaurines "Utahraptor" and "Achillobator", and again among the unenlagiines ("Austroraptor", which measured long). A possible third lineage of giant dromaeosaurids is represented by isolated teeth found on the Isle of Wight, England. The teeth belong to an animal the size of the dromaeosaurine "Utahraptor", but they appear to belong to velociraptorines, judging by the shape of the teeth.