Dinosaur size
There were larger dinosaurs, but knowledge of them is based entirely on a small number of fragmentary fossils. Most of the largest herbivorous specimens on record were discovered in the 1970s or later, and include the massive titanosaur "Argentinosaurus huinculensis", which is the largest dinosaur known from uncontroversial evidence, estimated to have been and long. Some of the longest sauropods were those with exceptionally long, whip-like tails, such as the "Diplodocus hallorum" (formerly "Seismosaurus") and the 33- to 35-metre-long (108–115 ft) "Supersaurus". The tallest was the "Brachiosaurus".
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.